SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Agrochemical, dye, and pigment chemists prefer Sodium Alkyl Naphthalene Sulfonate Condensate over uncondensed monomeric alkyl naphthalene sulfonates and dialkyl sulfosuccinates because monomeric surfactants desorb rapidly from solid surfaces and provide only dynamic wetting, whereas the multi-point methylene-bridged polymeric backbone of Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate locks onto milled particles to prevent flocculation, syneresis, and Ostwald crystal growth during elevated-temperature storage. Furthermore, compared to unsubstituted sodium naphthalene sulfonate formaldehyde condensates (SNF / Dispersant NNO), calcium or sodium lignosulfonates, and nonionic EO-PO block copolymers, the alkyl-substituted aromatic rings of Alkyl Naphthalene Sulfonate Condensate impart stronger affinity for hydrophobic pesticide active ingredients and disperse dyes, superior tolerance to hard water (up to 500 to 1,000 ppm CaCO3) and multivalent electrolytes, near-zero macro-foaming during high-energy bead milling, high thermal stability up to 130 to 150 °C in high-temperature polyester dyeing, and rapid granule disintegration without plasticizing WDG extrudates.

Supplied commercially as a free-flowing light-brown to dark-brown spray-dried powder (active sulfonate condensate content 85.0% to 95.0% w/w, bulk pour density 380 to 620 g/L, and moisture <= 3.0% to 5.0% w/w) or as a ready-to-meter 38.0% to 45.0% w/w aqueous liquid concentrate (specific gravity 1.18 to 1.26 g/cm3 at 20 °C), industrial grades are tailored by controlling condensation chain length, degree of alkylation, residual inorganic sodium sulfate (from <= 1.5% in ultra-low-salt grades to <= 5.0%–10.0% in standard grades), and free formaldehyde ceilings. Matching the exact CAS registry designation (such as CAS 68425-94-5, CAS 81065-51-2, CAS 9008-63-3, or CAS 9084-06-4), GPC molecular weight profile, and sulfate specification ensures immediate deflocculation, low millbase viscosity, and long-term suspension stability across crop protection, textile, pigment, ceramic, and construction systems.

CAS Number: 68425-94-5 (Primary UVCB/polymeric registry for sulfonated catalytic reformer methyl/alkyl naphthalene formaldehyde condensates, sodium salts; also cross-referenced by specific alkylation and monomer definitions under CAS 81065-51-2 [Naphthalenesulfonic acid, methyl-, polymer with formaldehyde, sodium salt], CAS 9008-63-3 / CAS 9008-64-4 [Alkyl / Dinonyl / Methylated naphthalenesulfonic acid formaldehyde polymers], CAS 9084-06-4 [Naphthalenesulfonic acid, polymer with formaldehyde, sodium salt], and CAS 36290-04-7; all listed under US EPA 40 CFR 180.910, 180.920, and 180.930 inert ingredient exemptions)

EC Number: 614-476-8 (Also indexed in European REACH / EINECS inventories under 270-115-0, 617-192-2 for CAS 81065-51-2, 618-442-3 for CAS 9008-64-4, and 618-665-6 for CAS 9084-06-4)

Molecular Formula: (C11H9O3SNa·CH2O)n or (C12H9O3SNa)n for the representative methylene-bridged sodium methylnaphthalene sulfonate repeating unit; generalized alkylated polymeric formula (C10+mH6+2mO3SNa·CH2O)n where m = 1 to 4 (methyl, dimethyl, isopropyl, or butyl substituent) and degree of polymerization n = 2 to 15

Molecular Weight: Variable oligomeric/polymeric distribution; repeating monomer unit molecular weight is 256.25 g/mol (for methylene-linked sodium monomethylnaphthalene sulfonate) or 270.28 g/mol (for dimethyl homologue), with number-average molecular weight (Mn) typically 800 to 2,800 g/mol and weight-average molecular weight (Mw by aqueous GPC/SEC) typically 1,200 to 6,000 g/mol depending on condensation degree

INCI Name: SODIUM POLYNAPHTHALENESULFONATE / SODIUM METHYLNAPHTHALENESULFONATE (Used in specialty industrial and technical cleanser registrations; primarily an agrochemical, textile, pigment, ceramic, and construction chemical rather than a leave-on cosmetic ingredient)

E Number: Not assigned (Industrial, agricultural, textile, and construction polymeric dispersant; not authorized as a direct food additive, whereas residues are exempt from food tolerance requirements when used as an inert dispersing/wetting adjuvant in pre- and post-harvest crop protection formulations under US EPA 40 CFR 180.910, 180.920, and 180.930, and approved for indirect food-contact paperboard and rubber articles under US FDA 21 CFR 176.170, 176.180, and 177.2600)

Melting Point: > 260 to 320 °C (Does not exhibit a sharp thermodynamic solid-to-liquid melting point at atmospheric pressure; dry powder chars and undergoes thermal decomposition above 260 to 320 °C; commercial 40% to 45% w/w aqueous liquid solutions exhibit a freezing/crystallization onset between -5 and +2 °C)
Boiling Point: Not applicable for the dry solid powder (non-volatile polymeric sodium salt with zero vapor pressure that decomposes thermally above 260 °C prior to boiling); 102 to 106 °C at 101.3 kPa for 38% to 45% w/w aqueous liquid concentrates (governed by water evaporation)

Viscosity: Not applicable as a free-flowing dry solid powder; in 10% w/w aqueous solution at 25 °C, dynamic viscosity is 2.0 to 6.5 mPa·s (cP); in 40% to 45% w/w commercial aqueous liquid concentrates at 25 °C, Brookfield dynamic viscosity is 45 to 220 mPa·s; in high-load 50% w/w agrochemical Suspension Concentrates (SC), 45% w/w disperse dye millbases, or 65% w/w ceramic/gypsum slurries, dosing 1.5% to 4.0% w/w Sodium Alkyl Naphthalene Sulfonate Condensate reduces apparent slurry viscosity from >3,500 mPa·s (unpumpable coagulated paste) down to 120 to 550 mPa·s at 20 s-1 shear rate

Density: True skeletal density of dry solid polymer 1.48 to 1.65 g/cm3 at 20 °C; Untapped bulk pour density of spray-dried powder 380 to 620 g/L (0.38 to 0.62 g/cm3, typically 450 to 560 g/L); Tapped bulk density 520 to 750 g/L (0.52 to 0.75 g/cm3); Specific gravity / density of 40% to 45% w/w aqueous liquid grades 1.18 to 1.26 g/cm3 at 20 °C

Most Frequently Encountered Synonyms:
Sodium Alkyl Naphthalene Sulfonate Condensate
Alkyl Naphthalene Sulfonate Condensate Sodium Salt
Alkyl Naphthalene Sulfonate Formaldehyde Condensate Sodium Salt
Sodium Alkylnaphthalenesulfonate Formaldehyde Condensate
Condensed Methyl Naphthalene Sulfonate Sodium Salt
Condensed Methyl Naphthalene Sulfonate, Sodium Salt
Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate
Sodium Methyl Naphthalene Formaldehyde Sulfonate
Methyl Naphthalene Sulfonic Acid Formaldehyde Condensate Sodium Salt
Naphthalenesulfonic Acid, Methyl-, Polymer with Formaldehyde, Sodium Salt
Alkyl Aromatic Sulfonic Acid Formaldehyde Condensate, Sodium Salts
Residues (Petroleum), Catalytic Reformer Fractionator, Sulfonated, Polymers with Formaldehyde, Sodium Salts
Sodium Polymethylnaphthalene Sulfonate
Alkyl Polynaphthalene Sulfonate Sodium Salt
Sodium Polyalkylnaphthalene Sulfonate (PANS)
Sodium Naphthalene Sulfonate Condensate (NSC / ANSC)
Sulfonated Methyl Naphthalene Formaldehyde Condensate Sodium Salt
Sulfonated Aromatic Condensate Sodium Salt

WHAT IS SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE?

Known in Turkish industrial commerce as Sodyum Alkil Naftalin Sülfonat Kondensatı, Kondense Metil Naftalin Sülfonat Sodyum Tuzu, Sodyum Metil Naftalin Formaldehit Sülfonat, or Dispersiyon Ajanı MF, Sodium Alkyl Naphthalene Sulfonate Condensate is a synthetic, water-soluble, strongly anionic polymeric dispersing agent belonging to the sulfonated aromatic formaldehyde polycondensate family. Rather than existing as a single low-molecular-weight surfactant monomer with a fixed stoichiometric formula, this functional polyelectrolyte consists of a controlled oligomeric distribution of alkyl-substituted naphthalene rings (predominantly monomethyl-, dimethyl-, isopropyl-, or butyl-naphthalene units) carrying ionized sodium sulfonate groups (-SO3- Na+) and linked covalently at the aromatic ring positions by methylene bridges (-CH2-) derived from formaldehyde condensation.

In global chemical inventories, agrochemical inert-ingredient regulations, and European REACH dossiers, Sodium Alkyl Naphthalene Sulfonate Condensate and its closely related methyl-substituted homologues are identified primarily under CAS No. 68425-94-5 (EC No. 614-476-8 / 270-115-0, formally defined as sulfonated catalytic reformer fractionator aromatic residues polymerized with formaldehyde, sodium salts) and CAS No. 81065-51-2 (EC No. 617-192-2, Naphthalenesulfonic acid, methyl-, polymer with formaldehyde, sodium salt). Depending on the exact alkyl substituent profile and starting monomer purity, commercial grades are also cross-referenced under CAS No. 9008-63-3, CAS No. 9008-64-4 (EC No. 618-442-3), CAS No. 36290-04-7, and the broader naphthalene sulfonate condensate identifier CAS No. 9084-06-4 (EC No. 618-665-6). Across all of these registry numbers, the defining structural feature of an Alkyl Naphthalene Sulfonate Condensate (ANSC) is the presence of short aliphatic alkyl groups (most commonly methyl -CH3 or dimethyl -(CH3)2 groups) attached to the condensed naphthalene rings.
Formulators and procurement specialists searching for agrochemical dispersants, textile dye grinding auxiliaries, or pigment deflocculants must strictly distinguish Sodium Alkyl Naphthalene Sulfonate Condensate from three related but functionally distinct chemical classes:

- 1. Distinction from Uncondensed Monomeric Sodium Alkyl Naphthalene Sulfonate (ANS Monomers, e.g., CAS 26264-58-4, CAS 28729-52-4, CAS 1322-93-6): Uncondensed Sodium Methyl-, Isopropyl-, or Diisobutyl-Naphthalene Sulfonates are single-ring monomeric wetting agents (molecular weight ~244 to 342 g/mol) synthesized without formaldehyde polymerization. Monomeric ANS surfactants rapidly lower the dynamic surface tension of water (down to 30–36 mN/m) to wet hydrophobic powders within seconds, but because each molecule possesses only a single aromatic ring and a single sulfonate group, it desorbs easily from particle surfaces and cannot prevent long-term sedimentation in Suspension Concentrates (SC). By contrast, Sodium Alkyl Naphthalene Sulfonate Condensate is a formaldehyde-polymerized oligomer (Mw 1,200 to 6,000 g/mol) carrying 3 to 15 sulfonated alkyl-naphthalene units per chain; it exhibits minimal surface-tension depression (48 to 58 mN/m at 1% w/w), generates very low foam, and anchors irreversibly via multi-point attachment to provide long-term electrostatic and electrosteric suspension stability!

- 2. Distinction from Unsubstituted Sodium Naphthalene Sulfonate Formaldehyde Condensate (SNF / PNS / Dispersant NNO, CAS 9084-06-4): Standard unsubstituted SNF is produced from pure unalkylated naphthalene (C10H8) sulfonated at the beta-position and condensed with formaldehyde. While unsubstituted SNF is a high-volume concrete water reducer and general dye dispersant, incorporating methyl or short alkyl substituents onto the aromatic rings in Condensed Methyl Naphthalene Sulfonate Sodium Salt (Dispersing Agent MF / agrochemical ANSC, CAS 68425-94-5 / 81065-51-2) increases the hydrophobicity and electron density of the aromatic planes. This alkyl modification dramatically strengthens van der Waals and hydrophobic adsorption onto non-polar organic pesticide crystals, disperse dyes, and carbon black, boosts hard-water calcium tolerance, and raises thermal stability in high-temperature (130 °C) dyeing baths.

- 3. Distinction from Hybrid Co-Formulated Wetting-Dispersing Blends: In commercial agrochemical trade, pure Sodium Alkyl Naphthalene Sulfonate Condensate powders (equivalent to industry-standard D-425 or MNS-90 grades) are frequently sold alongside pre-blended powder adjuvants that combine 70%–85% Sodium Alkyl Naphthalene Sulfonate Condensate with 15%–30% monomeric alkyl naphthalene sulfonate wetting agent, sodium dioctyl sulfosuccinate (DOSS), sodium lauryl sulfate, or EO-PO block copolymer. Verifying on the Technical Data Sheet from Ataman Kimya whether a grade is 100% neat Condensed Methyl Naphthalene Sulfonate Sodium Salt or a co-formulated wetting/dispersing blend is essential for accurate SC, WDG, and WP formulation design.

CHEMICAL STRUCTURE, MOLECULAR ARCHITECTURE AND POLYCONDENSATION CHEMISTRY

Understanding why Sodium Alkyl Naphthalene Sulfonate Condensate acts as an industry-benchmark primary dispersant and wet-milling aid in high-load agrochemical Suspension Concentrates, Water Dispersible Granules, disperse dye pastes, and cementitious slurries requires examining its three-domain macromolecular architecture:

1. The Planar Alkyl-Substituted Naphthalene Hydrophobic Anchor:
Each repeating monomer unit of Condensed Methyl Naphthalene Sulfonate Sodium Salt contains a fused bicyclic 10-pi-electron aromatic naphthalene ring system substituted with one or two methyl (-CH3) or short C2–C4 alkyl groups. Whereas linear aliphatic surfactants (such as alcohol ethoxylates or fatty acid soaps) possess flexible hydrocarbon tails that coil in water and interact weakly with flat aromatic crystal faces, the rigid, planar sp2-hybridized methyl-naphthalene rings of Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate match the planar aromatic rings present in the vast majority of modern synthetic herbicides, fungicides, insecticides, organic pigments, vat/disperse dyes, and graphitic carbon black nodules. The methyl or short alkyl substituents increase the molar hydrophobic contact area and shield the aromatic pi-cloud, driving strong, quasi-irreversible adsorption onto hydrophobic solid particles through combined pi-pi electron-donor-acceptor stacking and hydrophobic dehydration forces.

2. The Methylene-Bridged (-CH2-) Oligomeric Polymer Backbone:
During formaldehyde polycondensation under strongly acidic conditions, protonated hydroxymethyl carbocations (+CH2OH) attack activated unsubstituted positions on the sulfonated alkyl-naphthalene rings (predominantly linking alpha-positions such as C-4, C-5, or C-8 depending on where the methyl and sulfonate groups reside) to create covalent diarylmethane linkages (-Ar-CH2-Ar-). Because these methylene bridges restrict free rotation only partially while tying 3 to 15 sulfonated alkyl-naphthalene rings into a single macromolecular chain (number-average Mn 800 to 2,800 g/mol; weight-average Mw 1,200 to 6,000 g/mol), the resulting Alkyl Polynaphthalene Sulfonate Sodium Salt adsorbs onto a solid particle in a flat 'train-and-loop' conformation. Even if one aromatic ring momentarily detaches under thermal agitation or dilution shear, the remaining 4 to 12 covalently linked rings hold the polymer chain firmly on the crystal surface—explaining why Sodium Alkyl Naphthalene Sulfonate Condensate resists desorption upon 1:100 to 1:1,000 spray-tank dilution where monomeric surfactants wash off immediately!

3. The Strongly Ionized Sodium Sulfonate (-SO3- Na+) Polyelectrolyte Corona:
Attached covalently to each alkyl-naphthalene ring is at least one sulfonic acid group neutralized as the sodium salt (-SO3- Na+). Because aromatic sulfonic acids are strong acids with a negative acid dissociation constant (pKa < -1.5 to -2.0), the sulfonate groups on Sodium Alkyl Naphthalene Sulfonate Condensate remain nearly 100% ionized into negatively charged -SO3- anions across the entire practical pH spectrum from strongly acidic pH 1.0 to strongly alkaline pH 13.5. Unlike polycarboxylate dispersants (whose carboxylic acid groups, pKa ~4.5–5.0, protonate and lose their negative charge below pH 5.0), Condensed Methyl Naphthalene Sulfonate Sodium Salt maintains a dense, unyielding negative surface charge density in acidic agrochemical formulations, neutral pigment pastes, and highly alkaline pH 12.5–13.5 Portland cement pore water alike.

4. Influence of Degree of Polymerization (Condensation Number n) and Alkylation Degree:
- Low-to-Medium Condensation Grades (n = 2 to 5, Mw ~800 to 1,800 g/mol): Exhibit faster aqueous diffusion rates during high-energy zirconia bead milling of pesticide SC and pigment pastes, rapidly wetting freshly fractured crystal surfaces and providing balanced wetting-plus-dispersing power in Wettable Powders (WP) and rapid-disintegrating Water Dispersible Granules (WDG).
- Medium-to-High Condensation Grades (n = 6 to 15, Mw ~2,200 to 6,000 g/mol, such as high-MW Dispersing Agent MF and D-809-type agrochemical grades): Provide deeper multi-point anchoring, thicker electrosteric barrier layers (1.5 to 3.0 nm), superior tolerance to hard water (> 500 ppm CaCO3) and high electrolyte concentrations, and stronger inhibition of Ostwald crystal ripening in suspension concentrates and high-temperature textile dye baths.

INDUSTRIAL PRODUCTION AND MANUFACTURING PROCESSES

Commercial Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / CAS 81065-51-2) is manufactured in corrosion-resistant glass-lined or high-nickel alloy reactors through a tightly controlled four-step unit operation sequence: (1) Aromatic Feedstock Selection or Catalytic Alkylation, (2) High-Temperature Sulfonation, (3) Acid-Catalyzed Formaldehyde Polycondensation, and (4) Alkaline Neutralization, Sulfate Separation, and Spray Drying.

- Step 1: Aromatic Feedstock Selection and Alkylation: Industrial production utilizes either distilled coal-tar / petrochemical methylnaphthalene fractions (rich in 1-methylnaphthalene, CAS 90-12-0, and 2-methylnaphthalene, CAS 91-57-6, along with dimethylnaphthalene isomers, typically boiling between 240 and 270 °C from catalytic reformer fractionator bottoms) or pure naphthalene that is catalytically alkylated in situ with methanol, isopropanol, or n-butanol/isobutanol over an acid catalyst. In textile Dispersing Agent MF and premium agrochemical Condensed Methyl Naphthalene Sulfonate Sodium Salt grades, a refined alpha-/beta-methylnaphthalene cut is selected to guarantee uniform sulfonation reactivity and low insoluble tar formation.

- Step 2: Regioselective Sulfonation with Concentrated Sulfuric Acid or Oleum: Molten methylnaphthalene (or alkylnaphthalene feedstock) is charged into a jacketed reactor and reacted with 98% concentrated sulfuric acid (H2SO4) or 20% oleum (fuming sulfuric acid, H2SO4·SO3) at an acid-to-aromatic molar ratio of 1.05:1 to 1.35:1. Temperature is carefully staged—typically starting at 60 to 90 °C and ramping to 125 to 155 °C for 2 to 4 hours—to drive complete monosulfonation of the alkylnaphthalene rings (forming predominantly 2-methylnaphthalene-6-sulfonic acid, 1-methylnaphthalene-4-sulfonic acid, and related isomers) while minimizing sulfone cross-linking or oxidative charring.

- Step 3: Formaldehyde Polycondensation (Methylene Bridging): After cooling the sulfonated reaction mass to 80 to 105 °C and diluting with a precisely calculated volume of process water to adjust sulfuric acid strength, aqueous formaldehyde solution (typically 37% w/w formalin, added at 0.65 to 0.95 moles of CH2O per mole of alkylnaphthalene sulfonic acid depending on the target molecular weight Mw) is metered slowly subsurface over 2 to 4 hours. The mixture is held at 95 to 120 °C under autogenous pressure or reflux for 4 to 12 hours until electrophilic aromatic condensation reaches the target kinematic viscosity and GPC molecular weight distribution (linking n = 3 to 15 rings via -CH2- bridges) and residual free formaldehyde drops below specification limits.

- Step 4: Neutralization, Lime-Sulfate Precipitation (Low-Salt Refining), and Spray Drying: Because a stoichiometric excess of sulfuric acid is used during Step 2, neutralizing the acidic polycondensate directly with 30%–50% aqueous sodium hydroxide (NaOH) to pH 7.5–9.0 converts residual H2SO4 into dissolved inorganic sodium sulfate (Na2SO4, typically 8% to 18% on dry weight in unrefined technical grades). To manufacture high-purity, low-sulfate Agrochemical and Dispersing Agent MF grades (where Na2SO4 is controlled to <= 1.5%–5.0% w/w), manufacturers employ either lime-soda purification—adding calcium hydroxide Ca(OH)2 or calcium carbonate to precipitate excess sulfuric acid as insoluble gypsum (CaSO4·2H2O), filtering off the gypsum cake, and converting any calcium sulfonate to the sodium salt with sodium carbonate/hydroxide—or membrane nanofiltration/diafiltration to strip inorganic salts and uncondensed monomers. The clarified 38% to 45% w/w aqueous solution of Sodium Alkyl Naphthalene Sulfonate Condensate is either Drum/IBC-packed as a liquid concentrate or atomized through a high-pressure centrifugal/nozzle spray-drying tower (inlet air 190 to 240 °C, outlet air 90 to 105 °C) to yield hollow, rapidly water-soluble, free-flowing brown powder spheres.

Ataman Kimya operates as an international chemical supplier and distributor providing commercial grades of Sodium Alkyl Naphthalene Sulfonate Condensate—including agrochemical SC/WDG/WP dispersant powders, low-sulfate Condensed Methyl Naphthalene Sulfonate Sodium Salt grades, textile Dispersing Agent MF grades, and industrial construction/ceramic grades—from established global manufacturing origins.

PHYSICAL AND CHEMICAL PROPERTIES OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Quantitative physical constants, polymeric molecular parameters, and analytical specification ranges for commercial agrochemical, textile, pigment, ceramic, and construction grades of Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / CAS 81065-51-2 / CAS 9084-06-4, EC 614-476-8 / 270-115-0 / 617-192-2) are presented below with their standard analytical test methods:
Chemical Identity and Registry Numbers: CAS No. 68425-94-5 (Alkyl aromatic sulfonic acid formaldehyde condensate, sodium salts), CAS No. 81065-51-2 (Naphthalenesulfonic acid, methyl-, polymer with formaldehyde, sodium salt), CAS No. 9008-63-3 / 9008-64-4, and CAS No. 9084-06-4; EC / EINECS Numbers: 614-476-8, 270-115-0, 617-192-2, 618-442-3, and 618-665-6
Representative Repeating Molecular Formula: (C11H9O3SNa·CH2O)n or (C12H9O3SNa)n for sodium methylnaphthalene sulfonate formaldehyde condensate; generalized alkylated formula (C10+mH6+2mO3SNa·CH2O)n where m = 1 to 4 and n = 2 to 15
Repeating Monomer Unit Molecular Weight: 256.25 g/mol (for methylene-bridged sodium monomethylnaphthalene sulfonate unit) and 270.28 g/mol (for dimethylnaphthalene unit)
Polymer Molecular Weight Distribution (Aqueous Gel Permeation Chromatography / Size-Exclusion Chromatography, GPC/SEC against polystyrene sulfonate standards): Number-average molecular weight (Mn): 800 to 2,800 g/mol; Weight-average molecular weight (Mw): 1,200 to 6,000 g/mol (typically 1,500 to 3,200 g/mol for standard agrochemical SC/WDG grades and 3,000 to 6,000 g/mol for high-MW Dispersing Agent MF and hard-water-tolerant grades); Polydispersity Index (PDI = Mw/Mn): 1.6 to 3.2
Degree of Polymerization (Average Number of Condensed Aromatic Rings, n): 2 to 15 (typically 4 to 10 condensed methyl-naphthalene sulfonate units per polymer chain)
Physical State and Appearance (at 20 °C and 101.3 kPa): Spray-dried solid grades: Light-brown, tan, yellowish-brown, to dark-brown free-flowing fine powder or micro-granules; Liquid grades: Dark-brown viscous aqueous solution
Odor: Mild characteristic aromatic / slight naphthalene-like odor or nearly odorless
Active Sulfonate Condensate Content (Dry Powder Grades, by UV spectrophotometry at 228–232 nm / 290 nm or Methylene Blue / Hyamine 1622 two-phase titration): 85.0% to 95.0% w/w (Ultra-low-salt agrochemical and premium MF grades: >= 90.0% to 94.0% w/w; Standard agrochemical and textile grades: >= 85.0% to 90.0% w/w; Construction superplasticizer grades: 80.0% to 90.0% w/w)
Active Solid Content (Liquid Concentrate Grades, 105 °C oven solids): 38.0% to 45.0% w/w (typically 40.0% +/- 1.5% w/w or 42.0% +/- 1.5% w/w)
Melting Point / Thermal Decomposition Temperature (TGA / DSC at 101.3 kPa): > 260 to 320 °C (Does not melt into a neat liquid prior to decomposition; exhibits glass transition Tg > 160 °C in anhydrous state and undergoes endothermic/exothermic charring and desulfonation above 260 to 320 °C; aqueous 40% liquid grades freeze/crystallize at -5.0 to +2.0 °C)
Boiling Point (at 101.3 kPa): Not applicable for dry solid powder (non-volatile polymeric salt, vapor pressure < 10^-6 Pa at 25 °C); 102.0 to 106.0 °C for 40% to 45% w/w aqueous liquid concentrates
True Skeletal Density (Helium Pycnometry, 20 °C): 1.48 to 1.65 g/cm3 for dry powder
Bulk / Pour Density (Untapped Powder, ASTM D1895 / ISO 60): 380 to 620 g/L (0.38 to 0.62 g/cm3; standard spray-dried powder typically 440 to 560 g/L)
Tapped Bulk Density (ISO 787-11): 520 to 750 g/L (0.52 to 0.75 g/cm3)
Specific Gravity / Liquid Density (40% to 45% w/w Aqueous Solution at 20 °C, ASTM D1298 / ISO 758): 1.180 to 1.260 g/cm3 (typically 1.20 to 1.23 g/cm3 at 40% solids)
Dynamic Viscosity (Brookfield LV / Cone-and-Plate at 25 °C): 1.5 to 2.2 mPa·s at 1.0% w/w in water; 2.5 to 7.5 mPa·s at 10.0% w/w in water; 45 to 220 mPa·s at 40.0% to 45.0% w/w in commercial liquid concentrates; Slurry viscosity reduction power: reduces 50% w/w agrochemical SC or 65% w/w kaolin/calcium carbonate slurry viscosity from >3,500 mPa·s down to 120–500 mPa·s at 2.0%–3.5% w/w dosage
Aqueous Solution pH (at 20 to 25 °C, CIPAC MT 75.3 / ISO 4316): 7.0 to 9.5 (1.0% w/w aqueous solution typically pH 7.2 to 9.0; 10.0% w/w aqueous solution typically pH 7.5 to 9.5)
Water Solubility (at 20 °C): 450 to 600 g/L in cold water (100% miscible with water up to ~45%–50% w/w before reaching viscosity saturation; dissolves rapidly in < 30 to 60 seconds under gentle stirring)
Organic Solvent Solubility: Practically insoluble (< 0.1 g/L) in non-polar aliphatic and aromatic hydrocarbons (hexane, toluene, xylene, mineral oils), ketones, and esters; sparingly soluble in methanol, ethylene glycol, and propylene glycol/water co-solvent blends
Moisture Content / Loss on Drying (105 °C to constant weight or Karl Fischer, ISO 760): <= 3.0% to <= 5.0% w/w for spray-dried powder grades (typically 2.0% to 4.2% w/w)
Inorganic Sodium Sulfate Content (Na2SO4, by BaSO4 gravimetric precipitation or ion chromatography): <= 1.5% to <= 3.0% w/w for ultra-low-salt agrochemical SC and premium dye grades; <= 3.0% to <= 5.0% w/w for standard agrochemical WDG/WP and Dispersing Agent MF grades; <= 5.0% to <= 12.0% w/w for standard industrial and concrete superplasticizer grades
Chloride Ion Content (Cl-, Ion Chromatography / Potentiometric Titration): <= 0.05% to <= 0.20% w/w (<= 500 to 2,000 ppm, ensuring zero reinforcement-bar corrosion in concrete and zero stainless-steel pitting in bead mills)
Water-Insoluble Matter (Filtration through 0.45 micron membrane or 325-mesh / 45-micron sieve, CIPAC MT 10): <= 0.05% to <= 0.30% w/w (typically <= 0.10% w/w for agrochemical SC/WDG and textile grades)
Powder Particle Size Distribution (Dry Sieve Analysis, ASTM E11): >= 95.0% to 99.0% passing 80 mesh (180 microns) and >= 85.0% to 95.0% passing 200 mesh (75 microns)
Surface Tension (1.0% w/w Aqueous Solution at 25 °C, Du Noüy Ring DIN 53914 / Wilhelmy Plate): 46.0 to 60.0 mN/m (typically 48 to 56 mN/m for alkylated methylnaphthalene condensates, compared to 64 to 70 mN/m for unalkylated SNF and 30 to 36 mN/m for monomeric wetting surfactants)
Ross-Miles / CIPAC MT 47.2 Persistent Foam Height (0.2% to 1.0% w/w in 342 ppm CaCO3 Standard Water D at 25 °C): Initial foam height <= 15 to 40 mm; Persistent foam after 1 minute <= 2 to 15 mm (after 5 minutes: 0 to 5 mm, classified as a low-foaming / non-foaming polymeric dispersant)
Zeta Potential Imparted to Hydrophobic Particles (Electrophoretic Light Scattering at pH 7.0 in 10 mM NaCl): -35.0 to -65.0 mV (typically -42 to -58 mV on pesticide crystals, disperse dyes, TiO2, and carbon black)
Hard-Water Calcium & Magnesium Tolerance (CIPAC MT 41 / Standard Water D at 342 ppm and 500–1,000 ppm CaCO3): Clear, precipitate-free solution at 1.0% w/w in 342 ppm to 1,000 ppm CaCO3 hard water (calcium stability rating >= 800 to 1,500 ppm CaCO3 for high-MW methylnaphthalene sulfonate condensates)
Acid, Alkali, and Thermal Stability Window: Chemically stable against hydrolysis from pH 1.0 to pH 13.5; thermally stable in aqueous dye baths and autoclaves up to 130 to 150 °C (high-temperature disperse dyeing stability grade >= 4.0 to 5.0 on AATCC/ISO grey scale) and in spray-drying towers up to 220 °C
Dispersing Power / Grind Efficiency (Standard Disperse Dye / Carbon Black Filtration Test, HG/T 2566): >= 100% to 140% relative to standard reference MF (100%)
Residual Free Formaldehyde Content (Acetylacetone / HPLC method, ISO 14184-1): <= 0.05% to <= 0.10% w/w (<= 500 to 1,000 ppm in standard grades; <= 50 to 200 ppm in ultra-low free-formaldehyde grades)
Octanol-Water Partition Coefficient (log Kow, OECD 107 / 117): -2.5 to -0.8 (highly hydrophilic polyanion in water; does not bioaccumulate in aquatic organisms, BCF < 10 L/kg)
Flash Point and Flammability (ASTM D93 / UN Test N.1): Not applicable for aqueous solutions; dry powder is a non-flammable solid under UN Class 4.1 criteria (Minimum Dust Cloud Ignition Temperature MIT > 480 to 550 °C; thermal decomposition above 260 to 320 °C releases CO, CO2, and SOx).
These quantitative parameters represent industry benchmarks across commercial grades. Exact guaranteed specification limits for any delivery must be verified on the supplier's grade-specific Technical Data Sheet (TDS) and batch Certificate of Analysis (COA).

WHY EACH IMPORTANT PROPERTY OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE MATTERS IN PRACTICE

Agrochemical formulation chemists, textile dyehouse managers, pigment dispersion engineers, and concrete admixture technologists evaluate specific numerical metrics on a Sodium Alkyl Naphthalene Sulfonate Condensate COA because each parameter directly dictates wet-milling kinetics, storage stability, and field performance:

- Polymer Molecular Weight Distribution (Mw 1,200 to 6,000 g/mol by GPC) and Degree of Condensation (n = 3 to 15): Governs the balance between wetting speed and irreversible steric/electrostatic anchoring. If the average condensation degree is too low (n < 2, high monomer content), the Condensed Methyl Naphthalene Sulfonate Sodium Salt behaves like a simple wetting surfactant: it lowers surface tension initially but desorbs from pesticide or dye crystals during elevated-temperature storage (54 °C CIPAC MT 46.3 test), allowing dissolved active ingredient molecules to redeposit onto larger crystals via Ostwald ripening and form hard, unpourable bottom clay ('caking'). Conversely, if molecular weight is properly optimized (Mw 2,000 to 5,000 g/mol), each polymer chain anchors simultaneously across 5 to 12 surface sites, building a robust electrosteric barrier that locks particle size at d50 = 1.5 to 2.5 microns for 2 to 3 years of ambient storage!

- Degree and Type of Alkyl Substitution (Methyl / Dimethyl vs. Unalkylated Rings): Differentiates Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / 81065-51-2, Dispersing Agent MF) from ordinary unalkylated Sodium Naphthalene Sulfonate Condensate (CAS 9084-06-4, Dispersant NNO). Attaching methyl or short alkyl groups to the naphthalene rings increases hydrophobic adsorption energy on low-polarity pesticide actives (such as tebuconazole, azoxystrobin, epoxiconazole, aclonifen, or fipronil) and hydrophobic disperse dyes by 30% to 50%, while shielding the sulfonate groups from premature calcium bridging in hard water (342 to 1,000 ppm CaCO3).

- Inorganic Sodium Sulfate Content (Na2SO4, <= 1.5% to <= 5.0% w/w vs. 10%–18% w/w): Residual Na2SO4 is an inert by-product of sulfuric acid neutralization. In liquid agrochemical Suspension Concentrates (SC) and Suspo-Emulsions (SE), excessive sodium sulfate (> 5%–8% in the dispersant) raises the ionic strength of the continuous aqueous phase, compressing the electrical double layer (Debye length) around suspended particles, accelerating flocculation, and causing sodium sulfate decahydrate (Glauber's salt, Na2SO4·10H2O) crystals to precipitate during sub-zero freeze-thaw cycles. In dry Water Dispersible Granules (WDG) and Wettable Powders (WP), high sulfate increases hygroscopic caking in humid warehouses. Specifying a low-sulfate grade (<= 2.0% to <= 4.0% Na2SO4) of Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate prevents electrolyte-induced flocculation.

- Aqueous Solution pH (7.0 to 9.5 at 1%–10% w/w): Many agrochemical active ingredients (such as organophosphates, carbamates, strobilurins, and sulfonylureas) undergo rapid base- or acid-catalyzed hydrolysis if formulation pH drifts outside pH 6.0 to 8.5. A neutral-to-mildly-alkaline pH (7.2 to 8.8) on the Alkyl Naphthalene Sulfonate Condensate COA confirms complete neutralization of residual sulfonic/sulfuric acids without excess free caustic soda (NaOH).

- Water-Insoluble Matter (<= 0.05% to <= 0.20% w/w on 325-Mesh / 45-Micron Sieve): In agricultural field spraying through 50-mesh and 100-mesh nozzle screens and in sub-micron textile/inkjet dye milling, any insoluble gypsum (CaSO4) or over-crosslinked sulfone resin particles plug spray nozzles and foul zirconia bead mills.

- Low Persistent Foaming (CIPAC MT 47.2 Foam <= 5 to 15 mm) and Surface Tension (48 to 56 mN/m): During horizontal bead milling of 500 g/L pesticide SCs or 45% pigment concentrates, trapped air bubbles absorb mechanical rotor energy, drop grinding efficiency by 40%, and cause volumetric overflow when filling containers. Because Condensed Methyl Naphthalene Sulfonate Sodium Salt has a rigid polymeric backbone that does not pack into elastic air-water soap films, it delivers rapid solid-liquid deflocculation with near-zero persistent foam.

- Moisture Content (<= 3.0% to <= 5.0% w/w) and Bulk Pour Density (420 to 560 g/L): Low moisture keeps spray-dried Sodium Alkyl Naphthalene Sulfonate Condensate powder free-flowing in silos and loss-in-weight feeders, while controlled bulk density ensures uniform dry-blending with kaolin, silica, and active technical powders prior to WDG extrusion or air-jet micronization.

HOW DOES SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE WORK AT THE MOLECULAR AND INTERFACIAL LEVEL?

Sodium Alkyl Naphthalene Sulfonate Condensate stabilizes concentrated solid-in-liquid suspensions and dry water-dispersible powders through four interconnected physicochemical mechanisms:

- 1. Multi-Point Pi-Pi and Hydrophobic Adsorption onto Crystal Faces: When hydrophobic organic crystals (such as pesticide active ingredients, vat/disperse dyestuffs, or organic pigments) or carbonaceous/mineral particles (carbon black, kaolin, TiO2, cement clinker) are fractured inside a wet bead mill or air-jet mill, high-energy hydrophobic cleavage planes are exposed. In plain water, these newly created surfaces immediately snap back together via van der Waals attraction to minimize interfacial free energy, forming a stiff, unpumpable paste. When Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate is present in the millbase, its planar methyl-substituted naphthalene rings adsorb flat onto the hydrophobic crystal faces via pi-pi aromatic stacking and hydrophobic methyl interaction. Because 4 to 12 alkyl-naphthalene rings are linked covalently along each methylene-bridged chain, the Gibbs free energy of adsorption per macromolecule is multiplied—anchoring the polymer irreversibly onto the particle surface even under intense shear or high dilution.

- 2. DLVO Electrostatic Double-Layer Repulsion (Zeta Potential Generation): While the alkyl-naphthalene backbone lies flat against the solid crystal surface, the hydrophilic sodium sulfonate groups (-SO3- Na+) orient outward into the surrounding water phase and dissociate completely into negatively charged -SO3- anions and a diffuse cloud of solvated Na+ counterions. This dense anionic corona imparts a strong negative zeta potential (-40 to -65 mV) to every milled particle. According to Derjaguin-Landau-Verwey-Overbeek (DLVO) colloid theory, when two negatively charged particles approach each other under Brownian motion or gravity, their overlapping electrical double layers generate a steep electrostatic energy barrier (typically > 15 to 25 kBT) that prevents the particles from crossing into the primary van der Waals attraction well, keeping the suspension completely deflocculated and free-flowing.

- 3. Short-Range Electrosteric Hydration Barrier and Slurry Viscosity Reduction: In addition to long-range electrostatic repulsion, the adsorbed layer of methylene-bridged oligomeric chains (thickness ~1.5 to 3.0 nm) together with the tightly bound hydration shells surrounding each -SO3- group (approximately 6 to 8 water molecules per sulfonate anion) creates a short-range steric and hydration repulsion barrier. By breaking up three-dimensional particle flocs and releasing the 'immobilized water' trapped inside flocculated cages back into the bulk liquid, dosing just 1.5% to 3.5% w/w of Alkyl Naphthalene Sulfonate Condensate drops the yield stress and apparent viscosity of a 50% w/w solid slurry by 80% to 95%—allowing formulators to raise active ingredient loading from 250 g/L up to 500–600 g/L while maintaining a pourable Newtonian or weakly pseudoplastic liquid.

- 4. Rapid Capillary Disintegration ('Spontaneous Bloom') in WDG and WP Granules: In dry Water Dispersible Granules (WDG / WG) and Wettable Powders (WP), Condensed Methyl Naphthalene Sulfonate Sodium Salt acts as both an extrusion binder during wet granulation and a hydrophilic disintegrant/dispersant during field dilution. When dry WDG granules are poured into a farmer's spray tank, the highly soluble sodium sulfonate condensate bridges between the compressed pesticide particles dissolve within seconds upon water contact, generating instantaneous osmotic pressure and electrostatic repulsion that bursts the granule apart ('spontaneous bloom') into discrete 2-micron primary particles without clumping.

WHAT PROBLEMS CAN SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE HELP SOLVE?

Agrochemical R&D chemists, dye and pigment manufacturers, ceramic engineers, and construction chemical formulators incorporate Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / 81065-51-2) to overcome seven critical processing and stability failures:
Severe millbase thickening, bead-mill choking, and long grinding times in high-load suspensions
When milling hydrophobic pesticide actives (at 400 to 600 g/L) or disperse dyes/pigments (at 35% to 50% w/w) in horizontal zirconia bead mills, sub-micron particle fracturing multiplies specific surface area tenfold, causing unstabilized slurries to gel into a dilatant paste that overheats and chokes the mill screen. Adding 1.5% to 3.5% w/w of Condensed Methyl Naphthalene Sulfonate Sodium Salt immediately deflocculates newly fractured surfaces, cutting millbase viscosity below 300 mPa·s and reducing required bead-milling residence time by 30% to 50%.
Hard-pack bottom sedimentation ('claying') and syneresis during elevated-temperature storage
Poorly stabilized Suspension Concentrates (SC) settle under gravity into a dense, dilatant bottom cake ('clay') that cannot be resuspended by shaking the container. Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate maintains a high negative zeta potential (-45 to -60 mV) across ambient and 54 °C accelerated storage, working synergistically with xanthan gum or attapulgite/bentonite anti-settling networks to guarantee >= 95%–98% suspensibility and effortless resuspension.

Ostwald crystal ripening and nozzle-plugging needle growth in SC and SE formulations
Partially water-soluble active ingredients (such as tebuconazole, metribuzin, ethofumesate, phenmedipham, or azoxystrobin) dissolve slightly during warm storage and recrystallize onto larger crystals during cooling. Worse still, ethoxylated nonionic surfactants often solubilize active ingredients inside micelles and accelerate needle growth! Because Alkyl Polynaphthalene Sulfonate Sodium Salt forms no solubilizing aliphatic micelles and coats crystal growth steps with a dense polymeric layer, it acts as a potent Ostwald ripening inhibitor.
Slow granule disintegration, wet-sieve residue, and hard-water flocculation in WDG and WP products
Water Dispersible Granules that fail to disintegrate within 30 to 60 seconds in cold (10 °C) or hard (342–500 ppm CaCO3) spray-tank water leave coarse residue on 75-micron wet sieves and clog boom-sprayer nozzles. Incorporating 4% to 10% w/w of Sodium Alkyl Naphthalene Sulfonate Condensate delivers rapid granule bloom, crisp extrusion binding strength, and >90% CIPAC MT 184 suspensibility in hard water.
High-temperature dye aggregation and tar-spotting in 130 °C polyester disperse dyeing
Standard unsubstituted naphthalene sulfonate condensates (Dispersant NNO) and low-grade lignosulfonates lose dispersing power above 100–110 °C in pressurized jet and package dyeing machines, causing disperse dye particles to aggregate into tar spots on polyester fabric. Methyl-substituted Dispersing Agent MF (Condensed Methyl Naphthalene Sulfonate Sodium Salt) retains strong aromatic adsorption and dispersion stability up to 130–140 °C without fiber staining.

Dark brown staining, sugar fermentation, and batch variability of Lignosulfonates
While sodium and calcium lignosulfonates are inexpensive wood-pulping by-products, they contain reducing wood sugars that ferment in liquid storage or retard cement setting, produce heavy foam, and stain light-colored wettable powders, ceramics, and textiles dark brown. Synthetic Sodium Alkyl Naphthalene Sulfonate Condensate is sugar-free, non-fermenting, low-foaming, and manufactured to tight GPC molecular weight specifications.
High water demand, poor slump flow, and low early strength in concrete and gypsum slurries
In precast concrete, self-consolidating concrete, and gypsum wallboard production, flocculated cement and calcium sulfate hemihydrate particles trap 15% to 25% excess mixing water, lowering compressive strength and increasing kiln drying energy. Dosing 0.5% to 1.5% w/w of Polynaphthalene Sulfonate Sodium Salt deflocculates cement and gypsum grains, cutting water demand by 12% to 25% and boosting early and 28-day mechanical strength.

BENEFITS FOR THE MANUFACTURER AND END USER

Selecting the appropriate commercial grade of Sodium Alkyl Naphthalene Sulfonate Condensate from Ataman Kimya delivers quantifiable manufacturing efficiencies for the formulator and reliable field performance for the end user.
Benefits for the Agrochemical, Dye, Pigment, Ceramic, and Construction Manufacturer:
- Shorter Wet-Milling Cycles and Higher Throughput: Rapid electrostatic deflocculation reduces millbase viscosity by 80%–95%, enabling 30% to 50% faster zirconia bead-milling rates and higher active solid loadings (up to 500–600 g/L in SCs and 65%–75% in mineral slurries).
- Near-Zero Persistent Foam Under High Shear: Unlike monomeric surfactants, lauryl sulfates, or EO-PO block copolymers, the rigid methylene-bridged aromatic backbone of Condensed Methyl Naphthalene Sulfonate Sodium Salt generates minimal foam during wet grinding, spray drying, and high-speed bottle filling.
- Broad pH (1.0 to 13.5), Thermal (up to 140 °C in water / 220 °C spray drying), and Hard-Water Stability: Strongly ionized sulfonate groups (-SO3- Na+, pKa < -1.5) and protective methyl substituents ensure consistent dispersion across acidic, neutral, and highly alkaline media and in hard water up to 500–1,000 ppm CaCO3.

- Dual Binder and Disintegrant Action in WDG Extrusion: Provides cohesive green plasticity during twin-screw extrusion or fluid-bed granulation and dries into a crisp, non-sticky glassy matrix that disintegrates instantaneously in water.
- Full Compatibility with Anionic, Nonionic, and Polymeric Co-Dispersants: Blends seamlessly with monomeric alkyl naphthalene sulfonate wetting agents, sodium dioctyl sulfosuccinate, sodium lignosulfonates, polycarboxylate comb polymers, and EO-PO block copolymers.
Benefits for the Final Formulated Product and End User:
- Long-Term Storage Stability Without Claying or Crystal Growth: Protects commercial Suspension Concentrates, Suspo-Emulsions, and pigment pastes against bottom sedimentation and Ostwald crystal ripening through multi-year warehouse and freeze-thaw cycles.
- Instantaneous Spray-Tank Bloom and Nozzle-Clog-Free Application: Ensures farmers and industrial applicators experience rapid dilution dispersion, zero screen plugging, and uniform biological efficacy across every hectare sprayed.
- Level, Speck-Free High-Temperature Textile Dyeing and High-Strength Concrete: Delivers uniform shade depth in 130 °C polyester dyeing and high slump retention with 15%–25% water reduction in structural concrete.

APPLICATIONS OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Sodium Alkyl Naphthalene Sulfonate Condensate and its specialized methyl-substituted and low-sulfate variants are deployed across crop protection, textile dyestuff processing, pigment and carbon black dispersions, ceramics, emulsion polymerization, and construction materials.

Agrochemical Suspension Concentrates (SC), Suspo-Emulsions (SE), and Seed Treatments (FS)
In liquid water-based crop protection formulations (SC, SE, and FS containing 200 to 600 g/L of water-insoluble herbicides, fungicides, or insecticides such as tebuconazole, epoxiconazole, azoxystrobin, pyraclostrobin, aclonifen, metribuzin, flumioxazin, buprofezin, fipronil, imidacloprid, or chlorantraniliprole), Condensed Methyl Naphthalene Sulfonate Sodium Salt (CAS 68425-94-5 / 81065-51-2) is dosed at 1.5% to 5.0% w/w as the primary electrostatic dispersant and wet-milling aid. Frequently paired at a 1:1 to 3:1 ratio with a steric EO-PO block copolymer or acrylic graft copolymer, it cuts bead-mill viscosity, inhibits Ostwald crystal growth, and prevents flocculation during 54 °C and freeze-thaw storage.

Agrochemical Water Dispersible Granules (WDG / WG) and Wettable Powders (WP)
In solid dry-flowable WDG/WG (60% to 90% w/w active ingredient) and WP formulations, Sodium Alkyl Naphthalene Sulfonate Condensate is incorporated at 4.0% to 12.0% w/w alongside 1.5% to 3.5% w/w of a monomeric alkyl naphthalene sulfonate wetting agent (often combined with sodium lignosulfonate or polycarboxylate). During wet kneading and low-pressure basket or twin-screw extrusion, the condensate acts as a non-tacky binder that imparts high granule crush strength and low attrition dust; upon dilution in cold or hard field water, it triggers rapid granule disintegration (< 30 seconds) and >90% CIPAC suspensibility.

Textile Disperse Dye, Vat Dye, and Pigment Grinding & Standardization (Dispersing Agent MF)
In dyestuff manufacturing and textile wet processing, high-molecular-weight Condensed Methyl Naphthalene Sulfonate Sodium Salt—universally known as Dispersing Agent MF or Dispersant MF—is the premier grinding aid, standardizing diluent, and high-temperature bath stabilizer for disperse dyes (for polyester/PET fibers) and vat dyes (for cotton/cellulosic fibers). Added at 30% to 150% on dry presscake weight during sand or zirconia bead milling prior to spray drying, Dispersing Agent MF reduces dye particle size below 0.5–1.0 micron, prevents thermal re-agglomeration during 130 to 140 °C high-temperature high-pressure (HTHP) polyester dyeing, and avoids reducing or staining delicate fabric shades.

Aqueous Pigment Pastes, Carbon Black Slurries, Coatings, and Printing Inks
In waterborne architectural paints, industrial coatings, paper coatings, and flexographic/gravure printing inks, Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate (dosed at 1.0% to 6.0% w/w on pigment, or 10% to 25% on high-surface-area Carbon Black Pigment Black 7) deflocculates organic pigments (phthalocyanine blues/greens, azo reds/yellows, quinacridones), inorganic oxides (TiO2, iron oxides), and colloidal carbon black, maximizing color strength, tinting uniformity, and storage viscosity stability.

Concrete Superplasticizers (High-Range Water Reducers) and Gypsum Wallboard Slurries
In construction chemicals, Polynaphthalene Sulfonate Sodium Salt / Sulfonated Naphthalene Formaldehyde Condensate (SNF / PNS / ANSC, dosed at 0.4% to 1.8% w/w on cement weight) adsorbs onto hydrating C3A and C3S cement clinker grains to impart a strong negative zeta potential (-30 to -45 mV). This electrostatic deflocculation either increases concrete slump flow from 50 mm to >200 mm at constant water-to-cement ratio (for self-compacting and pumped concrete) or reduces mixing water demand by 12% to 25% to boost 1-day, 7-day, and 28-day compressive strength by 20% to 40% without retarding set time or corroding steel rebar. In gypsum plasterboard (wallboard) manufacturing, adding 0.2% to 0.8% w/w reduces stucco slurry water demand, cutting kiln drying fuel consumption by 15% to 20%.

Ceramic Slips, Refractory Castables, Kaolin/Calcium Carbonate Slurries, and Coal-Water Slurries
In ceramics, sanitaryware, and mineral processing, dosing 0.2% to 1.5% w/w of Alkyl Naphthalene Sulfonate Condensate deflocculates high-solids (60% to 75% w/w) kaolin clay, alumina, silica, zirconia, silicon carbide, and ground calcium carbonate (GCC) slurries, as well as 60%–70% w/w coal-water fuel slurries (CWS), enabling smooth pumping and high green-body packing density.

Synthetic Rubber Emulsion Polymerization and Latex Stabilization
In the manufacture of styrene-butadiene rubber (SBR), nitrile-butadiene rubber (NBR), polychloroprene (CR / neoprene), and natural/synthetic latexes, low-electrolyte Sodium Alkyl Naphthalene Sulfonate Condensate (0.5% to 3.0% phm) acts as a secondary anionic emulsion stabilizer that prevents mechanical and thermal latex coagulation during monomer stripping and compounding, and disperses sulfur, zinc oxide, and antioxidant curatives for dipped latex gloves.

Leather Tanning, Retanning, and Dye Leveling Auxiliaries
In leather wet-end processing (0.5% to 3.0% on shaved weight), Condensed Methyl Naphthalene Sulfonate Sodium Salt acts as a synthetic dispersing syntan that promotes uniform penetration of vegetable tannins, chrome/syntan retanning agents, and anionic acid/direct dyes through the hide cross-section, producing level, lightfast leather coloration.

WHICH INDUSTRIES USE SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE?

Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / CAS 81065-51-2 / CAS 9084-06-4) serves as a core functional raw material across major global manufacturing sectors:
- Agrochemical and Crop Protection Formulation (Herbicides, Fungicides, Insecticides, Acaricides, Biological Pesticides, and Seed Treatments in SC, WDG/WG, WP, SE, and DF formats)
- Textile Dyestuff Manufacturing and Wet Processing (Disperse dye and vat dye milling/standardization as Dispersing Agent MF, HTHP polyester dyeing, and textile printing pastes)
- Pigments, Carbon Black, Paints, Coatings, and Water-Based Printing Inks (Organic pigment presscake dispersion, Pigment Black 7 aqueous slurries, and architectural/industrial colorants)
- Construction Chemicals, Ready-Mix/Precast Concrete, and Gypsum Wallboard Manufacturing (High-range water-reducing superplasticizers, grouts, self-leveling mortars, and gypsum board stucco fluidizers)
- Ceramics, Sanitaryware, Technical Ceramics, and Refractories (High-solids clay, alumina, silica, and zirconia casting slip deflocculation)
- Synthetic Elastomer Emulsion Polymerization and Latex Compounding (SBR, NBR, and chloroprene latex stabilization and vulcanization dispersion preparation)
- Leather Tanning, Retanning, and Dyeing (Auxiliary dispersing syntan and dye leveling agent)
- Pulp, Paper, and Mineral Slurry Processing (Kaolin and calcium carbonate paper-coating slurries, pitch control dispersion, and coal-water slurry fuel stabilization)
- Industrial Cleaners, Oilfield Cementing/Drilling Fluids, and Water Treatment (Particulate anti-redeposition agents and high-temperature oilwell cement dispersants)

USE OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE IN AGROCHEMICAL FORMULATIONS (SC, WDG/WG, WP, SE AND FS)

In modern crop protection chemistry, Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / CAS 81065-51-2, listed as an approved tolerance-exempt inert ingredient for pre- and post-harvest food crops under US EPA 40 CFR 180.910, 180.920, and 180.930) is one of the most widely specified anionic polymeric dispersants worldwide.

1. Engineering High-Load Suspension Concentrates (SC) and Seed Treatments (FS):
During wet bead milling of hydrophobic technical active ingredients (melting point > 70 °C, water solubility < 500 ppm, such as tebuconazole, azoxystrobin, epoxiconazole, aclonifen, metobromuron, buprofezin, fipronil, or imidacloprid), Condensed Methyl Naphthalene Sulfonate Sodium Salt is dosed at 1.5% to 4.0% w/w (typically 20 to 35 g/L). While nonionic EO-PO block copolymers or polyarylphenyl ether (tristyrylphenol) ethoxylates provide steric stabilization, using them alone often leads to high millbase viscosity, foaming, and accelerated Ostwald crystal ripening (because nonionic micelles solubilize trace active ingredient and transport it between crystals). Combining 1.5% to 3.0% w/w of low-sulfate Sodium Alkyl Naphthalene Sulfonate Condensate (for high negative zeta potential -45 to -60 mV and crystal-face pinning) with 1.5% to 2.5% w/w of an EO-PO block copolymer or acrylic comb polymer delivers synergistic electrosteric stabilization: millbase viscosity drops below 250 mPa·s, foam remains minimal, and d90 particle size (< 4.5 microns) stays locked during 14-day 54 °C CIPAC MT 46.3 storage and sub-zero freeze-thaw cycling.

2. Formulating Rapid-Bloom Water Dispersible Granules (WDG / WG) and Wettable Powders (WP):
In WDG formulations produced by twin-screw/basket extrusion, high-shear pan granulation, or fluid-bed spray drying, Sodium Alkyl Naphthalene Sulfonate Condensate is incorporated at 4.0% to 10.0% w/w as the primary dispersant/binder, paired with 1.5% to 3.0% w/w of a monomeric sodium alkyl naphthalene sulfonate wetting agent (e.g., sodium isopropyl- or butyl-naphthalene sulfonate) and optionally 3.0% to 8.0% w/w sodium lignosulfonate or ammonium sulfate disintegrant. Why must both the condensate and the monomer be used together? Because monomeric ANS reduces water surface tension to ~33 mN/m so water penetrates granule pores within 5 to 15 seconds, while polymeric Sodium Alkyl Naphthalene Sulfonate Condensate immediately charges the wetted primary particles to -50 mV so they explode apart into a uniform suspension (> 90% CIPAC MT 184 suspensibility in 342 ppm CaCO3 hard water). Furthermore, unlike liquid or low-melting nonionic surfactants that soften WDG granules and cause caking under warehouse pallet pressure, high-Tg (> 160 °C) Condensed Methyl Naphthalene Sulfonate Sodium Salt forms crisp, hard, non-dusting granules.

3. Stabilizing Suspo-Emulsions (SE):
In Suspo-Emulsions combining a solid crystalline active ingredient in water with an emulsified liquid active ingredient (or oil adjuvant), Alkyl Naphthalene Sulfonate Condensate selectively adsorbs onto the solid crystal surfaces without destabilizing the oil-in-water emulsion droplets, preventing heteroflocculation (coalescence of oil droplets onto solid particles).

USE OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE IN TEXTILE DYEING, PIGMENTS AND INKS

In textile dyestuff manufacturing and wet dyeing operations, Condensed Methyl Naphthalene Sulfonate Sodium Salt (CAS 81065-51-2 / CAS 68425-94-5) is globally recognized as Dispersing Agent MF (or Methyl Naphthalene Sulfonate Formaldehyde Condensate):
- Wet Milling and Spray-Drying Standardization of Disperse and Vat Dyes: Crude synthesized disperse dyes (azo, anthraquinone, and heterocyclic dyes for polyester) and vat dyes (for cotton) are hydrophobic crystalline solids that must be ground in horizontal zirconia bead mills to a particle size of 0.2 to 1.0 micron. Dispersing Agent MF is added at 40% to 150% on dry dye presscake weight. Its methyl-substituted naphthalene rings bond tightly to the hydrophobic dye crystals, reducing millbase viscosity at 35%–45% solids, protecting the dye against thermal re-agglomeration inside the 200 °C spray-drying tower, and acting as the standardizing diluent to adjust commercial dye strength (e.g., 100% or 200% commercial strength).
- High-Temperature High-Pressure (HTHP) Polyester Jet and Package Dyeing at 130 to 140 °C: When polyester yarn packages or woven fabrics are dyed in pressurized autoclaves at 130 to 135 °C (pH 4.5–5.5 with acetic acid), standard unsubstituted naphthalene sulfonate condensate (Dispersant NNO) partially desorbs above 105 °C, allowing dye particles to collide, recrystallize, and filter out on the yarn package as dark 'tar spots' or uneven shading. Because the methyl substituents and higher condensation degree (n = 6 to 12, Mw 3,000–5,500 g/mol) of Dispersing Agent MF increase hydrophobic binding energy at elevated temperatures, Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate maintains a stable colloidal dye dispersion up to 135–140 °C, delivering level shade exhaustion and high rubbing fastness.
- Aqueous Organic Pigment and Carbon Black Concentrates: In water-based pigment pastes, paper coatings, and flexo inks, dosing 2.0% to 8.0% w/w of low-sulfate Sodium Alkyl Naphthalene Sulfonate Condensate (or 10% to 25% w/w on high-NSA Carbon Black Pigment Black 7) rapidly wets and deflocculates sub-micron pigment aggregates, boosting tinting strength and preventing thixotropic gelation.

USE OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE IN CONSTRUCTION, CERAMICS, GYPSUM AND LATEX SYSTEMS

Across heavy mineral processing, construction admixtures, and polymer latex manufacturing, Sodium Alkyl Naphthalene Sulfonate Condensate functions as a high-efficiency electrostatic deflocculant and water reducer:
- Concrete Superplasticizers (High-Range Water Reducers, ASTM C494 Type F / EN 934-2): Added at 0.5% to 1.5% dry weight on cement (or 1.2% to 3.5% of a 40% liquid concentrate), Polynaphthalene Sulfonate Sodium Salt adsorbs onto positively charged hydrating aluminate (C3A) and silicate (C3S) phases of Portland cement, charging all grains to -30 to -45 mV. This releases trapped floc water, achieving a 15% to 25% water reduction at constant slump (increasing 1-day, 7-day, and 28-day compressive strength by 25%–40% and lowering water permeability for bridges, tunnels, precast beams, and high-rise structures) or transforming a stiff mix into flowing concrete without segregation or steel-rebar corrosion (Cl- <= 0.1%).
- Gypsum Wallboard (Plasterboard) and Ceramic Casting Slips: In continuous gypsum board manufacturing, dosing 0.2% to 0.7% w/w of Sodium Alkyl Naphthalene Sulfonate Condensate fluidizes the calcium sulfate hemihydrate stucco slurry at a 10% to 18% lower water-to-stucco ratio, dramatically reducing natural gas consumption in the board-drying kiln while increasing board core compressive strength. In ceramic sanitaryware, porcelain tile, and alumina/zirconia casting slips, 0.2% to 1.0% w/w deflocculates clay and oxide particles to permit >68%–72% solids casting.
- Emulsion Polymerization and Rubber Latex Stabilization: In SBR, NBR, and chloroprene (CR) emulsion polymerization and dipped latex compounding, adding 0.5% to 2.5% phm of low-salt Alkyl Naphthalene Sulfonate Condensate provides mechanical and electrolyte shear stability to the polymer latex and disperses vulcanization curatives (sulfur, ZnO, ZDEC, ZMBT, and phenolic antioxidants) into uniform 1–2 micron aqueous dispersions.

FORMULATION AND PROCESS CONSIDERATIONS WHEN USING SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

To achieve maximum dispersion efficiency, rapid wetting, and multi-year shelf life when formulating with Sodium Alkyl Naphthalene Sulfonate Condensate, process engineers and R&D chemists must manage six key technical principles:
- 1. Pairing the Polymeric Condensate with a Monomeric Wetting Agent in WDG and WP Formulations: A frequent formulation mistake is assuming that Sodium Alkyl Naphthalene Sulfonate Condensate alone will provide instant powder wetting. Because Condensed Methyl Naphthalene Sulfonate Sodium Salt is a multi-ring oligomer (Mw 1,500–5,000 g/mol) with a relatively high surface tension (48–56 mN/m), it excels at keeping particles separated once wetted, but diffuses more slowly to the air-water interface than a small monomer. If a WDG or WP exhibits slow wetting time (> 60 seconds in CIPAC MT 53.3), do not simply add more polymeric condensate; instead, pair 5%–8% w/w Sodium Alkyl Naphthalene Sulfonate Condensate with 1.5%–3.0% w/w of a fast monomeric wetting agent (such as monomeric sodium isopropyl/butyl naphthalene sulfonate, sodium dioctyl sulfosuccinate, or sodium lauryl sulfate).

- 2. Synergistic Electrosteric Pairing with Nonionic EO-PO Block Copolymers in SC and SE Systems: In high-solids liquid Suspension Concentrates (400–600 g/L), purely electrostatic stabilization from an anionic condensate can be compressed by high electrolyte levels, while purely steric stabilization from an EO-PO block copolymer can suffer from high viscosity and Ostwald ripening. Combining 1.5%–3.0% w/w of Sodium Alkyl Naphthalene Sulfonate Condensate with 1.5%–2.5% w/w of a high-MW EO-PO block copolymer or acrylic comb polymer creates a dual electrosteric barrier that delivers both ultra-low bead-mill viscosity and exceptional 54 °C / freeze-thaw stability.

- 3. Order of Addition in Wet Bead Milling and Rheology Modifier Sequencing: Always dissolve Sodium Alkyl Naphthalene Sulfonate Condensate completely in the aqueous millbase water (along with antifoam and propylene glycol antifreeze) BEFORE charging the hydrophobic active ingredient or pigment powder. Never add xanthan gum or high-viscosity associative thickeners prior to zirconia bead milling, as high viscosity cushions bead impact; add the xanthan gum pre-gel in the post-milling let-down tank after d50 (< 2.0 microns) has been achieved.

- 4. Controlling Electrolyte Load and Selecting Low-Sulfate Grades (<= 2%–4% Na2SO4): When formulating electrolyte-sensitive SCs, high-density fertilizer-compatible suspensions, or sub-zero freeze-thaw stable concentrates, specify a Low-Sulfate grade of Condensed Methyl Naphthalene Sulfonate Sodium Salt (Na2SO4 <= 1.5%–3.5% w/w) to prevent double-layer compression and Glauber's salt crystal precipitation.

- 5. Avoiding Direct Mixing with Cationic Surfactants and Quaternary Ammonium Biocides: Because Sodium Alkyl Naphthalene Sulfonate Condensate is a strongly anionic polyelectrolyte carrying multiple -SO3- groups per chain, mixing it directly with cationic surfactants (quaternary ammonium salts, tallow amine ethoxylates at low pH, or cationic flocculants) triggers instantaneous 1:1 charge-neutralization coacervation and sticky gummy precipitation! When formulating with nitrogen-containing adjuvants (such as amine ethoxylates or betaines), ensure that anionic sulfonate equivalents remain in substantial molar excess or verify compatibility across the target pH window.

- 6. Hygroscopicity and Bag-Sealing Discipline in Powder Handling: Spray-dried Sodium Alkyl Naphthalene Sulfonate Condensate powder has a high specific surface area and is moderately hygroscopic when exposed to humid air (> 65% relative humidity), absorbing moisture to form surface crusts or lumps. Always reseal PE inner liners immediately after scooping or weighing.

TYPICAL USE LEVELS AND INITIAL FORMULATION APPROACHES FOR SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Typical commercial incorporation levels for Sodium Alkyl Naphthalene Sulfonate Condensate (on a dry active basis) depend on the formulation type and solid surface area:
- Agrochemical Suspension Concentrates (SC), Suspo-Emulsions (SE), and Seed Treatments (FS): 1.5% to 5.0% w/w (15 to 50 g/L, typically 2.0% to 3.5% w/w, often paired with 1.5%–2.5% EO-PO block copolymer or polycarboxylate).
- Agrochemical Water Dispersible Granules (WDG / WG): 4.0% to 12.0% w/w (typically 5.0% to 9.0% w/w as primary dispersant/extrusion binder, paired with 1.5%–3.0% monomeric ANS wetting agent).
- Agrochemical Wettable Powders (WP): 3.0% to 8.0% w/w (paired with 1.5%–3.0% monomeric wetting agent).
- Textile Disperse Dye and Vat Dye Milling & Standardization (Dispersing Agent MF): 30.0% to 150.0% w/w based on dry dye presscake weight; 0.5 to 3.0 g/L as a leveling/dispersing auxiliary in HTHP dyebaths.
- Aqueous Organic Pigment and Carbon Black Concentrates: 1.5% to 8.0% w/w on organic/inorganic pigment weight; 10.0% to 25.0% w/w on high-surface-area Carbon Black (Pigment Black 7).
- Concrete High-Range Water-Reducing Admixtures (Superplasticizers): 0.4% to 1.5% w/w dry powder on cement weight (or 1.0% to 3.5% w/w of a 40% liquid concentrate).
- Gypsum Wallboard Stucco and Ceramic Casting Slips: 0.2% to 1.0% w/w on dry mineral solids.
- Synthetic Rubber Latex Stabilization and Curative Dispersions: 0.5% to 3.0% phm in latex; 2.0% to 5.0% w/w in 50% sulfur/ZnO/antioxidant dispersions.
The four laboratory and pilot frameworks below illustrate preliminary R&D evaluation protocols for qualified technical personnel.

EXAMPLE 1: BENCH-SCALE EVALUATION OF A 430 G/L TEBUCONAZOLE SUSPENSION CONCENTRATE (SC)

Purpose: To evaluate wet bead-milling kinetics, millbase viscosity, CIPAC MT 184 suspensibility, and 14-day 54 °C accelerated storage stability (Ostwald ripening inhibition) in a 430 g/L Tebuconazole (or Azoxystrobin) Suspension Concentrate (SC) stabilized with Sodium Alkyl Naphthalene Sulfonate Condensate.
Initial screening formulation (per 1,000 g batch, density ~1.12 g/cm3):
- Tebuconazole Technical (98.0% purity, melting point ~105 °C): 392.0 g (delivering 384 g/kg = ~430 g/L active)
- Sodium Alkyl Naphthalene Sulfonate Condensate Powder (CAS 68425-94-5 / 81065-51-2, active >= 90%, Na2SO4 <= 3.0%, Mw ~2,800 g/mol): 25.0 g (2.5% w/w primary electrostatic dispersant and crystal-growth inhibitor)
- EO-PO Block Copolymer or Acrylic Graft Copolymer Dispersant (steric co-dispersant): 18.0 g (1.8% w/w)
- Propylene Glycol (antifreeze / humectant): 60.0 g (6.0% w/w)
- Polydimethylsiloxane (PDMS) Emulsion Defoamer (10% active): 3.0 g (0.3% w/w)
- 1,2-Benzisothiazolin-3-one (BIT, 20% biocide): 1.5 g (0.15% w/w)
- Xanthan Gum (2.0% pre-hydrated aqueous gel, added post-milling): 75.0 g of 2% gel (delivering 0.15% w/w dry xanthan gum)
- Deionized Water (balance to 1,000.0 g): 425.5 g
Laboratory evaluation procedure:
- Stage 1 (Slurry Pre-Dispersion): Charge the 425.5 g deionized water, 60.0 g propylene glycol, 25.0 g Sodium Alkyl Naphthalene Sulfonate Condensate powder, 18.0 g steric co-dispersant, and 2.0 g defoamer into a jacketed mixing vessel at 20–25 °C and stir for 15 minutes until completely dissolved. Add the 392.0 g Tebuconazole technical powder under a high-shear rotor-stator homogenizer (5,000 rpm for 15 minutes) to obtain a smooth, low-foam millbase.
- Stage 2 (Horizontal Zirconia Bead Milling): Recirculate the pre-dispersion through a cooled horizontal bead mill loaded at 80% v/v with 0.8–1.0 mm yttria-stabilized zirconia beads (chamber temperature strictly < 30 °C) until laser diffraction particle size reaches d50 = 1.6 to 2.0 microns and d90 < 4.5 microns.
- Stage 3 (Post-Milling Let-Down and QC Testing): Transfer the milled slurry to a low-shear paddle mixer, blend in the 75.0 g of 2% xanthan gum gel, 1.5 g BIT biocide, and remaining 1.0 g defoamer for 30 minutes. Measure Brookfield RV viscosity (at 20 rpm), wet-sieve residue on 75-micron (200-mesh) screen (< 0.02%), spontaneous bloom and CIPAC MT 184 suspensibility in 342 ppm CaCO3 Standard Water D at 30 °C (>= 96%), and particle size shift after 14 days at 54 °C (CIPAC MT 46.3) and 5 freeze-thaw cycles (-10 °C / +25 °C).

EXAMPLE 2: PILOT EXTRUSION OF A 75% WATER DISPERSIBLE GRANULE (75 WDG / WG) PESTICIDE FORMULATION

Purpose: To prepare a 75% w/w Water Dispersible Granule (75 WG / WDG) herbicide/fungicide formulation by low-pressure basket extrusion and evaluate granule disintegration time, wet-sieve residue, and hard-water suspensibility.
Initial dry-blend composition (by weight):
- Active Ingredient Technical Powder (e.g., Metribuzin, Mancozeb, or Trifloxystrobin technical, 97.5% purity): 77.0%
- Sodium Alkyl Naphthalene Sulfonate Condensate Powder (CAS 68425-94-5, >= 90% active, primary dispersant and extrusion binder): 7.5%
- Monomeric Sodium Alkyl Naphthalene Sulfonate Wetting Agent Powder (e.g., sodium isopropyl/butyl naphthalene sulfonate): 2.5%
- Sodium Lignosulfonate or Ammonium Sulfate (co-binder / osmotic disintegrant): 5.0%
- Kaolin Clay (fine air-floated inert carrier, balance to 100.0%): 8.0%
Laboratory evaluation procedure:
- Dry-blend all five powder components in a ribbon blender for 15 minutes, then pass the dry pre-mix through a laboratory air-jet micronizer (fluid-energy mill) to reduce the entire powder blend to d50 = 2.5 to 4.0 microns and d90 < 10 microns.
- Transfer 500 g of the micronized powder blend into a planetary sigma-blade kneader and spray in 14% to 18% w/w deionized water while kneading for 10 minutes to form a cohesive, non-sticky plastic dough.
- Extrude the moist dough through a 0.8 mm or 1.0 mm perforated dome/basket extruder screen and dry the cylindrical extrudates in a laboratory fluid-bed dryer at 55 to 65 °C until residual moisture is <= 1.2% w/w; sieve between 0.5 mm and 2.0 mm screens.
- Evaluate the finished 75 WG granules in 342 ppm and 500 ppm CaCO3 hard water at 20 °C and 10 °C for: number of cylinder inversions for complete disintegration (target <= 8 to 12 inversions / < 30 seconds), CIPAC MT 184 suspensibility after 30 minutes (>= 90%), CIPAC MT 185 wet-sieve residue on 75-micron screen (<= 0.05%), CIPAC MT 47.2 persistent foam after 1 minute (<= 10 mm), and accelerated storage stability after 14 days at 54 °C under 25 g/cm2 load.

EXAMPLE 3: HIGH-TEMPERATURE DISPERSE DYE MILLING AND STANDARDIZATION WITH DISPERSING AGENT MF

Purpose: To evaluate bead-milling particle size reduction, filterability (AATCC / HG/T filter paper spot test), and 130 °C high-temperature dyebath dispersion stability of a Disperse Blue / Disperse Red presscake ground with Condensed Methyl Naphthalene Sulfonate Sodium Salt (Dispersing Agent MF).
Initial wet-milling charge (40% total solids in water):
- Disperse Dye Filter Presscake (calculated on 100% dry pure dye basis): 100.0 g
- Condensed Methyl Naphthalene Sulfonate Sodium Salt (Dispersing Agent MF, CAS 81065-51-2 / 68425-94-5, Mw ~4,200 g/mol, Na2SO4 <= 3.0%, Ca2+/Mg2+ < 800 ppm): 100.0 g (1:1 weight ratio to pure dye)
- Low-foaming nonionic wetting/humectant aid: 2.0 g
- Deionized water (including moisture contained in the dye presscake, adjusted to 40.0% total slurry solids): 303.0 g
Laboratory evaluation procedure:
- Dissolve the 100.0 g Dispersing Agent MF and wetting aid in the deionized water, charge the Disperse Dye presscake, and pre-disperse for 20 minutes using a high-speed sawtooth dissolver.
- Mill the 40% slurry in a laboratory vertical or horizontal zirconia bead mill (0.4 to 0.6 mm beads) at < 40 °C for 2 to 3 hours until 95% of the dye particles measure < 0.8 micron by laser diffraction and the vacuum Büchner funnel double-filter-paper filtration time (at 1% dye dispersion) is < 5 to 10 seconds with zero coarse residue on the top paper.
- Spray-dry the milled dispersion (inlet 185 °C, outlet 90 °C) to obtain a free-flowing, dust-reduced 100%-strength commercial disperse dye powder.
- Test high-temperature dyebath stability by heating a 2.0 g/L aqueous dispersion buffered at pH 4.8 (acetic acid/sodium acetate) in a sealed stainless-steel dyeing bomb at 130 °C for 45 minutes, filtering hot through quantitative filter paper, and rating tar-spot freedom (target Grade 4.5 to 5.0).

EXAMPLE 4: HIGH-RANGE WATER REDUCTION AND SLUMP FLOW EVALUATION IN PORTLAND CEMENT CONCRETE AND GYPSUM SLURRY

Purpose: To evaluate water reduction percentage, slump flow retention, and 1-day / 28-day compressive strength gain when dosing Sodium Alkyl Naphthalene Sulfonate Condensate in a Portland cement mortar / concrete mix (ASTM C494 / EN 480).
Initial test mortar / concrete design parameters:
- Ordinary Portland Cement (CEM I 42.5R or Type I/II): 400 kg/m3
- Graded quartz sand (0–4 mm) + coarse crushed aggregate (4–16 mm): 1,820 kg/m3
- Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / 9084-06-4, dosed at 0.80% dry active weight on cement weight = 3.20 kg dry polymer/m3, or 8.0 kg/m3 of a 40% liquid superplasticizer): 0.80% bwoc
- Mixing water: reduced from 200 kg/m3 (Control w/c = 0.50) down to 160 kg/m3 (Test w/c = 0.40, representing a 20.0% water reduction) to match the same target slump of 180 +/- 15 mm
Laboratory evaluation procedure:
- Dry-mix cement and aggregates for 60 seconds in a forced-action pan mixer, add 80% of the mixing water and mix for 60 seconds, then add the remaining 20% water containing the dissolved Sodium Alkyl Naphthalene Sulfonate Condensate (delayed addition by 60 seconds prevents premature C3A organo-mineral absorption and maximizes fluidity!) and mix for 120 seconds.
- Measure initial Abrams cone slump (ASTM C143), air content (target < 2.0%, confirming non-air-entraining low-foam behavior), initial and final Vicat setting times, and compressive strength of 150 mm cubes at 1 day, 7 days, and 28 days.

COMPATIBILITY AND INCOMPATIBILITY OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Evaluating chemical and ionic compatibility is essential when formulating Sodium Alkyl Naphthalene Sulfonate Condensate into multi-component agrochemical, textile, pigment, or construction systems:
- Full Compatibility with Anionic Surfactants and Polymeric Dispersants: Because Condensed Methyl Naphthalene Sulfonate Sodium Salt is strongly anionic, it is 100% compatible with all other anionic surfactants and dispersants—including monomeric sodium alkyl naphthalene sulfonates (wetting agents), sodium dioctyl sulfosuccinate (DOSS), sodium lauryl sulfate (SLS), linear alkylbenzene sulfonates (LAS), alpha-olefin sulfonates, phosphate esters, tristyrylphenol ethoxylate sulfates/phosphates, sodium and calcium lignosulfonates, and polycarboxylate / polyacrylate comb polymers.

- Full Compatibility with Nonionic Surfactants and Hydrocolloid Rheology Modifiers: Miscible and synergistic with EO-PO block copolymers (poloxamers), fatty alcohol ethoxylates, tristyrylphenol ethoxylates, alkyl polyglucosides (APGs), sorbitan esters, xanthan gum, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), carboxymethylcellulose (CMC), and attapulgite/bentonite clays.

- Severe Direct Incompatibility with Cationic Surfactants and Quaternary Ammonium Salts: Never mix concentrated Sodium Alkyl Naphthalene Sulfonate Condensate directly with cationic quaternary ammonium compounds (such as benzalkonium chloride, cetrimonium bromide, or didecyldimethylammonium chloride), cationic polyamine flocculants, or protonated fatty amines at equimolar charge ratios. The polyvalent anionic sulfonate chains (-SO3-) and cationic ammonium ions (+NR4) undergo instantaneous electrostatic ion-pairing (coacervation), precipitating an insoluble, sticky, water-repellent gum that ruins the suspension! Note: As documented in specialized agrochemical formulations, trace additions of weakly basic nitrogen-containing alkoxylates, alkanolamides, or amphoteric betaines can be co-formulated ONLY when the molar equivalents of anionic sulfonate groups remain in substantial excess over nitrogen groups and compatibility is verified across the target pH.

- High-Electrolyte and Multivalent Cation Limits: While Alkyl Naphthalene Sulfonate Condensate tolerates hard water up to 500–1,000 ppm CaCO3 and moderate electrolyte levels, adding concentrated divalent or trivalent metal salt solutions (such as > 5%–10% CaCl2, MgSO4, FeCl3, or Al2(SO4)3) or saturated brines will compress the electrical double layer and salt out or bridge the sulfonate chains.

- Incompatibility with Strong Oxidizing Agents: Keep dry powder and liquid concentrates away from strong oxidizers (concentrated nitric acid, hydrogen peroxide > 30%, sodium hypochlorite bleach, chlorates, perchlorates, and permanganates), which oxidize the methyl-naphthalene aromatic rings and cause exothermic degradation.

- Compatibility with Packaging and Plant Materials of Construction: Neutral-to-alkaline (pH 7.0–9.5) aqueous solutions and dry powders of Sodium Alkyl Naphthalene Sulfonate Condensate are completely non-corrosive to AISI 304 and 316L stainless steel, carbon steel (in alkaline concrete/slurry service), high-density polyethylene (HDPE), polypropylene (PP), PVC, glass, and all standard elastomers (EPDM, NBR, fluoroelastomer, and PTFE).

SIMILAR PRODUCTS AND ALTERNATIVES TO SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

When designing a suspension concentrate, water-dispersible granule, dye millbase, or mineral slurry, formulators compare Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / 81065-51-2) against uncondensed monomeric alkyl naphthalene sulfonates, unsubstituted naphthalene sulfonate condensates, lignosulfonates, polycarboxylate comb polymers, and nonionic EO-PO block copolymers.

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE AND MONOMERIC SODIUM ALKYL NAPHTHALENE SULFONATE (WETTING AGENTS)

Monomeric Sodium Alkyl Naphthalene Sulfonates—such as Sodium Methyl Naphthalene Sulfonate monomer (CAS 26264-58-4), Sodium Isopropyl Naphthalene Sulfonate (CAS 28729-52-4), and Sodium Diisobutyl / Dibutyl Naphthalene Sulfonate (CAS 1322-93-6 / 25417-20-3)—are uncondensed single-ring surfactants (MW ~244 to 342 g/mol) manufactured without formaldehyde polymerization.
Because they are small, agile monomers, they migrate rapidly to air-water interfaces, drop dynamic surface tension to 30–36 mN/m, and wet hydrophobic powders in < 10 seconds, but they generate moderate-to-high foam and desorb rapidly from solid particles, offering weak long-term suspension stability. Conversely, Polymeric Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / 81065-51-2, Mw 1,200–6,000 g/mol) has 4 to 15 methylene-linked rings per molecule: it exhibits weak wetting power on its own (surface tension ~50–56 mN/m) and very low foam, but locks irreversibly onto particle surfaces to deliver superior wet-milling viscosity reduction and long-term anti-settling stability. In WDG and WP formulations, the two products are complementary partners (e.g., 2% monomeric ANS for instant wetting + 6% polymeric ANSC for dispersion).

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE AND UNSUBSTITUTED NAPHTHALENE SULFONATE CONDENSATE (SNF / DISPERSANT NNO)

Unsubstituted Sodium Naphthalene Sulfonate Formaldehyde Condensate (SNF / PNS / Dispersant NNO, CAS No. 9084-06-4, EC No. 618-665-6) is manufactured from unalkylated naphthalene (C10H8) sulfonated at the beta-position and condensed with formaldehyde.
While unsubstituted SNF is an economical concrete superplasticizer and general leather/textile auxiliary, introducing methyl or short alkyl groups onto the naphthalene rings in Sodium Alkyl Naphthalene Sulfonate Condensate (Condensed Methyl Naphthalene Sulfonate Sodium Salt, CAS 68425-94-5 / 81065-51-2, Dispersing Agent MF) provides three decisive technical advantages: (1) higher hydrophobic affinity for non-polar organic pesticide crystals and disperse dyes, resulting in faster bead milling and stronger Ostwald ripening inhibition; (2) superior hard-water calcium tolerance (up to 500–1,000 ppm CaCO3 vs. < 300 ppm for low-MW unalkylated SNF); and (3) significantly higher thermal dispersion stability at 130 to 140 °C in high-temperature polyester dyeing.

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE AND SODIUM / CALCIUM LIGNOSULFONATES

Sodium Lignosulfonate (CAS No. 8061-51-6) and Calcium Lignosulfonate (CAS No. 8061-52-7) are natural sulfonated phenylpropane polymers obtained as by-products of sulfite wood pulping (Mw 5,000 to >50,000 g/mol).
Although lignosulfonates are inexpensive WDG binders and dispersants, they suffer from botanical batch-to-batch variability, contain 5% to 20% wood sugars and hemicelluloses (which promote microbial fermentation in liquid SCs and retard cement hydration), generate more foam during wet milling, stain textiles and light-colored powders dark brown, and have lower anionic charge density per gram. Synthetic Sodium Alkyl Naphthalene Sulfonate Condensate is 100% sugar-free, non-fermenting, low-foaming, lighter in staining, and delivers higher electrostatic dispersing power at 30% to 50% lower dosage. In many economical WDG recipes, formulators blend 4% Sodium Alkyl Naphthalene Sulfonate Condensate with 4% Sodium Lignosulfonate to combine crisp granule binding with rapid hard-water bloom.

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE AND POLYCARBOXYLATE (PCE) / ACRYLIC COPOLYMER DISPERSANTS

Polycarboxylate Ether (PCE) Comb Polymers and Sodium Polyacrylate / Styrene-Maleic Anhydride (SMA) Copolymers are synthetic carboxylate-functional dispersants that combine electrostatic repulsion (-COO- Na+) with long-chain polyethylene glycol (PEG) steric side chains.
While PCEs and acrylic comb polymers allow ultra-low dosage in concrete and certain high-load SCs, their carboxylate anchoring groups (-COO-, pKa ~4.5–5.0) lose ionization below pH 5.0, their ester linkages can hydrolyze in strongly alkaline storage, they are 2 to 4 times more expensive per kilogram than Condensed Methyl Naphthalene Sulfonate Sodium Salt, and their PEG side chains can plasticize and soften WDG granules under warm warehouse storage. Sodium Alkyl Naphthalene Sulfonate Condensate remains 100% ionized from pH 1.0 to 13.5, never hydrolyzes, and forms hard, non-caking WDG granules.

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE AND EO-PO BLOCK COPOLYMERS / TRISTYRYLPHENOL ETHOXYLATES

Ethylene Oxide / Propylene Oxide (EO-PO) Block Copolymers (Poloxamers, CAS 9003-11-6) and Tristyrylphenol Ethoxylates (TSP-EO) are nonionic polymeric surfactants that stabilize suspensions via steric hindrance.
However, nonionic ethoxylates exhibit inverse temperature solubility (cloud points between 55 and 95 °C, causing complete flocculation in 130 °C dyeing or hot spray drying), generate substantial foam, are waxy pastes or liquids that soften WDG granules, and solubilize partially soluble pesticide actives inside micelles to accelerate Ostwald crystal growth. In practice, Sodium Alkyl Naphthalene Sulfonate Condensate and EO-PO block copolymers are used synergistically in liquid SCs (e.g., 2.5% ANSC + 1.5% EO-PO copolymer) to combine high negative zeta potential with steric stabilization.

QUALITY GRADES, QUALITY CONTROL AND PURCHASING CRITERIA FOR SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Commercial Sodium Alkyl Naphthalene Sulfonate Condensate is manufactured and supplied in five specialized quality tiers tailored to the purity, salt tolerance, and molecular-weight demands of the end-use industry:
- 1. Standard Agrochemical SC / WDG / WP Dispersant Grade (D-425 / MNS-90 Type, CAS 68425-94-5 / 81065-51-2): Spray-dried light-to-dark brown powder with Active Sulfonate Condensate >= 88.0%–92.0%, Na2SO4 <= 3.0%–5.0%, Moisture <= 4.0%, pH (1%–10% aq.) 7.5–9.5, Water-Insolubles <= 0.10%, and Mw ~1,800–3,500 g/mol. Compliant with US EPA 40 CFR 180.910 / 180.920 / 180.930 for pre- and post-harvest crop protection formulations.

- 2. High-Molecular-Weight / Hard-Water-Tolerant & Ultra-Low-Sulfate Agrochemical Grade (D-809 / MNS Low-Salt Type): Refined via lime-gypsum filtration or membrane nanofiltration to achieve Active Content >= 92.0%–95.0%, Na2SO4 <= 1.5%–2.5%, higher condensation degree (Mw 3,500–6,000 g/mol), and hard-water calcium tolerance up to 1,000 ppm CaCO3 for electrolyte-sensitive SCs, ZCs, and high-load WDGs.

- 3. Co-Formulated Wetting-Dispersing Hybrid Agrochemical Powder Grades (D-450 / EFW / D-500 / D-360 Types): Engineered blends combining Sodium Alkyl Naphthalene Sulfonate Condensate with monomeric sodium alkyl naphthalene sulfonate wetting agent, anionic lauryl/sulfosuccinate wetter, EO-PO block copolymer, or sodium lignosulfonate for one-pack WP and WDG manufacturing.

- 4. Textile Disperse & Vat Dye Grinding Grade (Dispersing Agent MF, CAS 81065-51-2 / 68425-94-5): High-condensation methylnaphthalene sulfonate formaldehyde condensate with Dispersing Power >= 100%–130% vs. Standard MF, high-temperature 130 °C dyeing stability >= Grade 4.5, Ca2+/Mg2+ <= 600–800 ppm, Iron (Fe) <= 50–100 ppm, and Na2SO4 <= 3.0%–5.0%.

- 5. Industrial Construction Superplasticizer, Gypsum, Ceramic, and Latex Grade (Powder & 40%–42% Liquid): Supplied as 85%–90% powder or 40%–42% w/w aqueous liquid concentrate (Cl- <= 0.05%–0.15%, Na2SO4 <= 5.0%–10.0%) for ASTM C494 Type F concrete admixtures, gypsum wallboard fluidizers, ceramic slips, and SBR/NBR latex stabilization.
Incoming Quality-Control (QC) Parameters to Verify on Every Shipment:
- Exact Chemical Identity and CAS / EC Numbers (CAS 68425-94-5, CAS 81065-51-2, CAS 9008-63-3, or CAS 9084-06-4) and confirmation of neat Condensate vs. blended wetting/dispersing grade
- Active Sulfonate Condensate Content (UV absorbance at 230/290 nm or two-phase titration, % w/w) or Total Solids (for 40%–42% liquid grades)
- Inorganic Sodium Sulfate Content (Na2SO4, % w/w) and Chloride Content (Cl-, % w/w)
- Aqueous Solution pH (at 1% or 10% w/w, 7.0 to 9.5) and Water-Insoluble Matter (325-mesh / 0.45-micron filtration, <= 0.10%–0.30%)
- Moisture Content / Loss on Drying (105 °C, <= 3.0%–5.0% w/w) and Bulk Pour Density (g/L)
- GPC Molecular Weight Profile (Mn, Mw, PDI), Hard-Water Calcium Stability (342 ppm and 500 ppm CaCO3), CIPAC MT 47.2 Persistent Foam Height, and Residual Free Formaldehyde (ppm)

STORAGE AND HANDLING OF SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

Warehouse Storage Conditions for Sodium Alkyl Naphthalene Sulfonate Condensate: Store Sodium Alkyl Naphthalene Sulfonate Condensate (including Condensed Methyl Naphthalene Sulfonate Sodium Salt, Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate, and Dispersing Agent MF) in tightly sealed original polyethylene-lined multi-wall paper bags, woven polypropylene bags, fiber drums, or high-density polyethylene (HDPE) IBC totes in a cool, dry, well-ventilated indoor warehouse maintained between 5 and 35 °C away from direct sunlight, rain, steam pipes, and incompatible oxidizing chemicals.

Hygroscopic Moisture Pickup and Caking Prevention for Condensed Methyl Naphthalene Sulfonate Sodium Salt: Because spray-dried Sodium Alkyl Naphthalene Sulfonate Condensate powder consists of hollow, water-soluble microspheres with high specific surface area, open bags of Alkyl Naphthalene Sulfonate Condensate exposed to relative humidity above 60%–65% rapidly absorb atmospheric moisture and cake into hard lumps. Always keep inner polyethylene bag liners of Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate tightly tied or heat-sealed immediately after partial use, and do not stack palletized bags of Dispersing Agent MF more than two pallets high in warm, humid climates to prevent compression caking. If mild pressure caking occurs in stored bags of Sodium Alkyl Naphthalene Sulfonate Condensate without chemical moisture degradation, the lumps break apart readily during mechanical charging and dissolve completely in water with unchanged dispersing performance. For 40%–42% w/w liquid concentrates of Sodium Alkyl Naphthalene Sulfonate Condensate, protect IBC totes and bulk tanks from freezing below 0 °C; if slight crystal precipitation occurs during sub-zero winter transit, warm the liquid Alkyl 

Naphthalene Sulfonate Condensate container gently to 20–35 °C and circulate until homogeneous before pumping.
Safe Handling, Dust Control, and Environmental Spill Containment for Sodium Alkyl Naphthalene Sulfonate Condensate: Handle dry Sodium Alkyl Naphthalene Sulfonate Condensate powder and Condensed Methyl Naphthalene Sulfonate Sodium Salt at charging stations equipped with local exhaust ventilation (LEV) or dust-collection hoods to prevent airborne dust generation during bag dumping, weighing, pneumatic conveying, or air-jet micronization. Never sweep dry spills of Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate or Dispersing Agent MF with dry brooms or compressed air jets; collect spilled Sodium Alkyl Naphthalene Sulfonate Condensate powder using HEPA-filtered industrial vacuum cleaners or damp-shoveling into labeled recovery drums, and wash residual trace films with water (noting that aqueous solutions of Alkyl Naphthalene Sulfonate Condensate make smooth floors slippery). Prevent uncontrolled releases of concentrated Sodium Alkyl Naphthalene Sulfonate Condensate solutions or washings from entering storm drains or surface watercourses. Strictly segregate stored Sodium Alkyl Naphthalene Sulfonate Condensate from strong oxidizing agents (hypochlorites, concentrated nitric acid, peroxides, and chlorates) and from cationic quaternary ammonium surfactants.

FIRST AID MEASURES AND SAFETY INFORMATION FOR SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

First Aid Measures for Sodium Alkyl Naphthalene Sulfonate Condensate (Condensed Methyl Naphthalene Sulfonate Sodium Salt / Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate / Dispersing Agent MF):

- Inhalation of Sodium Alkyl Naphthalene Sulfonate Condensate Dust or Aerosols: If a worker inhales airborne dust of Sodium Alkyl Naphthalene Sulfonate Condensate, Condensed Methyl Naphthalene Sulfonate Sodium Salt powder, or spray mist of liquid Alkyl Naphthalene Sulfonate Condensate, immediately move the exposed individual into fresh air and keep them warm and at rest in a comfortable breathing position. Have the person blow their nose gently and rinse the mouth and throat with clean water to clear deposited Dispersing Agent MF dust from the upper respiratory tract; obtain medical attention if coughing, throat irritation, wheezing, or shortness of breath persists after inhaling Sodium Alkyl Naphthalene Sulfonate Condensate.

- Eye Contact with Sodium Alkyl Naphthalene Sulfonate Condensate: Concentrated Sodium Alkyl Naphthalene Sulfonate Condensate powder or liquid Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate can cause serious eye irritation or corneal damage upon direct contact. If Condensed Methyl Naphthalene Sulfonate Sodium Salt or Alkyl Naphthalene Sulfonate Condensate enters the eyes, immediately flush the eyes with plenty of lukewarm running water or sterile isotonic eyewash solution for at least 15 to 20 minutes while holding the eyelids wide open and removing contact lenses if present and easy to do; seek immediate ophthalmological medical care after eye exposure to Sodium Alkyl Naphthalene Sulfonate Condensate.

- Skin Contact with Sodium Alkyl Naphthalene Sulfonate Condensate: Immediately remove work clothing and shoes contaminated with Sodium Alkyl Naphthalene Sulfonate Condensate or Dispersing Agent MF and wash the affected skin thoroughly with mild soap and plenty of running water. Obtain medical advice if prolonged contact with Condensed Methyl Naphthalene Sulfonate Sodium Salt causes persistent skin redness, dryness, or irritation, and launder contaminated clothing before reuse.

- Ingestion of Sodium Alkyl Naphthalene Sulfonate Condensate: If Sodium Alkyl Naphthalene Sulfonate Condensate or Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate is accidentally swallowed, rinse the mouth thoroughly with water and give the conscious person 1 to 2 glasses of water to drink. Do not induce vomiting after swallowing Condensed Methyl Naphthalene Sulfonate Sodium Salt unless explicitly instructed by a physician or poison control center, and consult a doctor if gastrointestinal irritation, nausea, or abdominal discomfort develops.
Workplace Safety, GHS Classification, and Toxicological Profile of Sodium Alkyl Naphthalene Sulfonate Condensate:
Depending on the specific degree of alkylation, monomer content, and notified REACH/CLP dossier, commercial grades of Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / CAS 81065-51-2 / CAS 9084-06-4) are typically classified under GHS / EU CLP Regulation (EC) No 1272/2008 as causing Eye Irritation Category 2 (H319: Causes serious eye irritation) or Serious Eye Damage Category 1 (H318, particularly for lower-MW alkylated grades or blends containing monomeric wetting agents), and Skin Irritation Category 2 (H315) or mild mechanical dust irritation. Acute oral toxicity of polymeric Condensed 

Methyl Naphthalene Sulfonate Sodium Salt is low (rat oral LD50 typically > 2,000 to > 5,000 mg/kg; dermal LD50 > 2,000 mg/kg), and the material is non-sensitizing and non-mutagenic. Always verify the exact GHS hazard statements (including any aquatic chronic hazard classification for specific short-chain alkylated UVCB grades) on Section 2 of the grade-specific Safety Data Sheet for Sodium Alkyl Naphthalene Sulfonate Condensate.
Personal Protective Equipment (PPE) for Handling Sodium Alkyl Naphthalene Sulfonate Condensate:
Operators weighing, dumping, milling, or pumping Sodium Alkyl Naphthalene Sulfonate Condensate and Dispersing Agent MF must wear tightly fitting dust-proof / splash-proof safety goggles (EN 166), impervious chemical-resistant gloves (nitrile rubber, butyl rubber, or neoprene), long-sleeved protective workwear, safety boots, and a certified particulate dust respirator (EN 149 FFP2 / NIOSH N95) whenever local exhaust ventilation cannot keep airborne Sodium Alkyl Naphthalene Sulfonate Condensate dust below occupational nuisance dust limits (typically 4 to 10 mg/m3 inhalable dust TWA).

Commercial Packaging and Transport Logistics for Sodium Alkyl Naphthalene Sulfonate Condensate:
- 20 kg or 25 kg net multi-wall kraft paper or woven polypropylene bags with heat-sealed inner polyethylene moisture-barrier liners (for spray-dried Sodium Alkyl Naphthalene Sulfonate Condensate powder)
- 25 kg or 50 kg polyethylene-lined fiber drums
- 500 kg to 1,000 kg net Flexible Intermediate Bulk Containers (FIBC / big bags / jumbo bags) with inner PE liners
- 200 kg to 240 kg net tight-head HDPE drums and 1,000 kg to 1,200 kg net composite IBC totes (for 40%–45% w/w liquid concentrates of Sodium Alkyl Naphthalene Sulfonate Condensate)
Transport Classification: Standard polymeric Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / CAS 81065-51-2 / CAS 9084-06-4) is non-flammable, non-explosive, and non-corrosive, and is generally NOT regulated as Dangerous Goods for road (ADR/RID), sea (IMDG), or air (IATA) transport (always verify Section 14 of the supplier's current SDS for the specific grade).

WHAT SHOULD BE CONSIDERED WHEN PURCHASING SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE?

Because commercial products traded as Sodium Alkyl Naphthalene Sulfonate Condensate span different CAS numbers, molecular weight distributions, sulfate levels, and neat-versus-blended compositions, procurement and R&D teams should specify six key parameters in their Request for Quotation (RFQ) to Ataman Kimya:

- 1. Target Industry and Formulation Type: Specify whether the Sodium Alkyl Naphthalene Sulfonate Condensate is intended for agrochemical Suspension Concentrates (SC), Water Dispersible Granules (WDG/WG), Wettable Powders (WP), Suspo-Emulsions (SE), textile disperse/vat dye milling (Dispersing Agent MF), aqueous pigment/carbon black pastes, ceramic/gypsum slurries, latex stabilization, or concrete superplasticizers.
- 2. Exact CAS Registry Number and Neat vs. Blended Identity: State the required CAS number (e.g., CAS 68425-94-5, CAS 81065-51-2, CAS 9008-63-3, or CAS 9084-06-4) for regulatory dossier or US EPA 40 CFR 180.910 / 180.920 / 180.930 inert compliance, and clarify whether you require 100% neat Condensed Methyl Naphthalene Sulfonate Sodium Salt (such as a D-425 or MNS-90 type) or a co-formulated wetting/dispersing blend (such as a D-450, EFW, or D-500 type).

- 3. Active Sulfonate Content and Maximum Sodium Sulfate Ceiling (Na2SO4 %): Specify whether your formulation requires an Ultra-Low-Sulfate grade (Active >= 90%–93%, Na2SO4 <= 1.5%–3.0% for electrolyte-sensitive SCs and sub-zero freeze-thaw stability), a Standard Agrochemical/Dye MF grade (Active >= 88%–90%, Na2SO4 <= 3.0%–5.0%), or a Standard Construction/Industrial grade (Na2SO4 <= 5.0%–10.0%).
- 4. Molecular Weight Window (GPC Mw) and Hard-Water Tolerance: Specify standard medium-MW (Mw 1,500–3,000 g/mol for fast wet-milling and WDG disintegration) or high-MW (Mw 3,500–6,000 g/mol for maximum hard-water tolerance up to 1,000 ppm CaCO3 and 130 °C HTHP dyeing stability).

- 5. Physical Form (Spray-Dried Powder vs. 40%–42% Liquid Concentrate) and Trace Limits: Specify spray-dried powder (moisture <= 4.0%, 325-mesh insolubles <= 0.10%) or 40%–42% liquid concentrate, along with any required limits on pH (7.0–9.0), chloride (Cl- <= 0.1%), calcium/magnesium, or residual free formaldehyde.
- 6. Packaging Format, Order Volume, and Documentation: Specify 25 kg PE-lined bags, 500–1,000 kg FIBC big bags, or 240 kg drums / 1,100 kg IBC totes, spot shipment quantity, annual forecast, and required TDS, 16-section GHS SDS, and batch COA documents.

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE SUPPLY FROM ATAMAN KİMYA

Sodium Alkyl Naphthalene Sulfonate Condensate—including Condensed Methyl Naphthalene Sulfonate Sodium Salt, Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate, Alkyl Naphthalene Sulfonate Condensate (ANSC), and Dispersing Agent MF under CAS No. 68425-94-5, CAS No. 81065-51-2, CAS No. 9008-63-3, and CAS No. 9084-06-4 (EC No. 614-476-8 / 270-115-0 / 617-192-2)—is supplied by Ataman Kimya for agrochemical crop protection formulations (SC, SE, FS, WDG/WG, and WP), disperse and vat textile dye milling and high-temperature dyeing, aqueous pigment and carbon black dispersions, ceramic and gypsum slurries, synthetic rubber latex stabilization, leather processing, and high-range water-reducing concrete admixtures.
Companies planning to source Sodium Alkyl Naphthalene Sulfonate Condensate from Ataman Kimya can share their target formulation type, active ingredient or pigment system, and analytical specification requirements to confirm grade suitability, benchmark equivalence, current stock availability, packaging options, and commercial quotation details.
Sharing the following information in a quotation request facilitates rapid technical matching by the Ataman Kimya team:
- Target application sector and formulation type (agrochemical SC, SE, WDG, WG, or WP; textile disperse/vat dye milling; pigment/carbon black slurry; ceramic slip; gypsum board; or concrete superplasticizer)
- Requested CAS Registry Number (e.g., CAS 68425-94-5 or CAS 81065-51-2) and benchmark grade type (neat condensed methyl naphthalene sulfonate sodium salt vs. higher-MW hard-water grade vs. wetting/dispersing blend)
- Required minimum active content (e.g., >= 90% or >= 88% powder, or 40%–42% liquid) and maximum inorganic sodium sulfate limit (e.g., <= 2.5%, <= 5.0%, or <= 10.0% Na2SO4)
- Required physical form (free-flowing spray-dried powder vs. aqueous liquid concentrate), pH range, moisture limit, and 325-mesh water-insoluble limit
- Estimated order quantity (spot shipment and annual forecast) and preferred packaging (25 kg PE-lined bags, 500–1,000 kg FIBC big bags, or IBC totes)
- Delivery destination, preferred Incoterms, and required technical documentation (TDS, SDS, COA, and incumbent product specification if evaluating a replacement)

FREQUENTLY ASKED QUESTIONS ABOUT SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE

What is Sodium Alkyl Naphthalene Sulfonate Condensate?
Sodium Alkyl Naphthalene Sulfonate Condensate (also known as Condensed Methyl Naphthalene Sulfonate Sodium Salt, Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate, Alkyl Naphthalene Sulfonate Condensate, and Dispersing Agent MF, CAS No. 68425-94-5 / 81065-51-2) is a water-soluble, strongly anionic polymeric dispersant manufactured by sulfonating alkyl-substituted (predominantly methyl-substituted) naphthalene rings, condensing them with formaldehyde into methylene-bridged (-CH2-) oligomers (n = 2 to 15, Mw 1,200 to 6,000 g/mol), and neutralizing with sodium hydroxide.

What is the CAS number and EC number of Sodium Alkyl Naphthalene Sulfonate Condensate?
The primary CAS Registry Numbers are 68425-94-5 (EC No. 614-476-8 / 270-115-0, sulfonated catalytic reformer methyl/alkyl naphthalene formaldehyde polymers, sodium salts) and 81065-51-2 (EC No. 617-192-2, methylnaphthalenesulfonic acid polymer with formaldehyde, sodium salt). Related structural grades are also indexed under CAS 9008-63-3, CAS 9008-64-4 (EC 618-442-3), CAS 36290-04-7, and CAS 9084-06-4 (EC 618-665-6).

What is the difference between Sodium Alkyl Naphthalene Sulfonate Condensate and monomeric Sodium Alkyl Naphthalene Sulfonate?
Monomeric Sodium Alkyl Naphthalene Sulfonate (such as CAS 26264-58-4 or CAS 28729-52-4) is an uncondensed single-ring surfactant (MW ~244–342 g/mol) that lowers water surface tension to 30–36 mN/m and acts primarily as a fast wetting agent, but foams and desorbs easily from solid particles. Sodium Alkyl Naphthalene Sulfonate Condensate (CAS 68425-94-5 / 81065-51-2) is a formaldehyde-condensed oligomer (Mw 1,200–6,000 g/mol) with 4 to 15 rings per chain that generates very low foam and anchors irreversibly onto crystals to provide long-term electrostatic dispersion and milling viscosity reduction.

What is the difference between Condensed Methyl Naphthalene Sulfonate Sodium Salt (Dispersing Agent MF) and unsubstituted Naphthalene Sulfonate Condensate (SNF / Dispersant NNO)?
Unsubstituted SNF / Dispersant NNO (CAS 9084-06-4) is made from unalkylated naphthalene (C10H8), whereas Condensed Methyl Naphthalene Sulfonate Sodium Salt / Dispersing Agent MF (CAS 68425-94-5 / 81065-51-2) is made from methyl-substituted naphthalene. The methyl groups on the aromatic rings impart stronger hydrophobic affinity for organic pesticide crystals and disperse dyes, higher hard-water calcium tolerance (up to 500–1,000 ppm CaCO3), and superior dispersion stability at 130–140 °C in high-temperature dyeing.

What is the molecular formula and molecular weight of Sodium Alkyl Naphthalene Sulfonate Condensate?
Because it is a polymeric polycondensate, it is represented by the repeating unit formula (C11H9O3SNa·CH2O)n or (C12H9O3SNa)n (monomer unit MW 256.25 g/mol for the monomethyl derivative), with a number-average molecular weight (Mn) of 800 to 2,800 g/mol and a weight-average molecular weight (Mw) of 1,200 to 6,000 g/mol depending on the degree of polymerization (n = 2 to 15).

How does Sodium Alkyl Naphthalene Sulfonate Condensate stabilize agrochemical Suspension Concentrates (SC) and Water Dispersible Granules (WDG)?
Its planar alkyl-naphthalene rings adsorb flat onto hydrophobic pesticide crystal faces via pi-pi stacking and multi-point hydrophobic attachment, while its ionized sodium sulfonate groups (-SO3- Na+) project into water to impart a strong negative zeta potential (-40 to -65 mV) and a hydrated electrosteric barrier that prevents flocculation, cuts millbase viscosity, and inhibits Ostwald crystal ripening.

Why is Sodium Alkyl Naphthalene Sulfonate Condensate an effective inhibitor of Ostwald ripening in pesticide SC formulations?
Unlike ethoxylated nonionic surfactants that form aliphatic micelles in water and solubilize partially soluble active ingredients—transporting dissolved molecules from small crystals to large crystals—Sodium Alkyl Naphthalene Sulfonate Condensate does not form solubilizing micelles and binds tightly across crystal growth steps, arresting crystal growth during 54 °C storage and thermal cycling.

If a Water Dispersible Granule (WDG) or Wettable Powder (WP) has good dispersion but slow wetting, should I add more Sodium Alkyl Naphthalene Sulfonate Condensate?
No. Polymeric Sodium Alkyl Naphthalene Sulfonate Condensate is a primary dispersant (surface tension ~48–56 mN/m), not a rapid surface-tension-lowering wetting agent. To accelerate powder or granule wetting (< 15–30 seconds), add 1.5% to 3.0% w/w of a monomeric wetting agent such as monomeric sodium isopropyl/butyl naphthalene sulfonate or sodium dioctyl sulfosuccinate alongside 5% to 8% w/w of the polymeric condensate.

Why does inorganic Sodium Sulfate (Na2SO4) content matter on a Sodium Alkyl Naphthalene Sulfonate Condensate COA?
Excess Na2SO4 (> 5%–10% w/w) increases aqueous ionic strength, which compresses the electrostatic double layer around suspended pesticide or pigment particles, promotes flocculation, precipitates Glauber's salt crystals (Na2SO4·10H2O) during sub-zero freeze-thaw storage in liquid SCs, and increases moisture caking in dry WDGs. High-performance agrochemical and dye grades control Na2SO4 to <= 1.5%–5.0% w/w.

Is Sodium Alkyl Naphthalene Sulfonate Condensate approved for use in agricultural crop protection formulations applied to food crops?
Yes. Sodium Alkyl Naphthalene Sulfonate Condensate and related methyl/alkyl naphthalenesulfonic acid formaldehyde condensates (including CAS 68425-94-5, CAS 9008-63-3, CAS 9084-06-4, and CAS 36290-04-7) are listed by the US EPA under 40 CFR 180.910, 180.920, and 180.930 with an exemption from the requirement of a tolerance when used as inert dispersing/wetting ingredients in pesticide formulations applied pre- and post-harvest.

What pH range and water hardness can Sodium Alkyl Naphthalene Sulfonate Condensate tolerate?
Because aromatic sulfonic acid groups have a pKa below -1.5, the sulfonate anions (-SO3-) remain 100% ionized across pH 1.0 to 13.5, while the methyl-substituted polymer backbone tolerates hard water from 342 ppm (CIPAC Standard Water D) up to 500–1,000 ppm CaCO3 without precipitation.

Why is Condensed Methyl Naphthalene Sulfonate Sodium Salt (Dispersing Agent MF) used in high-temperature polyester dyeing?
During high-temperature high-pressure (HTHP) dyeing of polyester at 130 to 140 °C, standard dispersants desorb and allow disperse dye particles to aggregate into tar spots. The methylated aromatic rings and higher condensation degree (Mw 3,000–5,500 g/mol) of Dispersing Agent MF maintain strong dye adsorption and colloidal dispersion stability up to 140 °C without staining or reducing dye shades.

How is Sodium Alkyl Naphthalene Sulfonate Condensate used in concrete and gypsum wallboard manufacturing?
Dosed at 0.4% to 1.5% w/w on cement weight (or 0.2% to 0.7% in gypsum stucco), it deflocculates cement and calcium sulfate hemihydrate grains via electrostatic repulsion (-30 to -45 mV zeta potential), reducing mixing water demand by 12% to 25%, boosting concrete compressive strength by 20% to 40%, and cutting gypsum board kiln-drying energy.

Can Sodium Alkyl Naphthalene Sulfonate Condensate be mixed with cationic surfactants?
No. Direct mixing with cationic quaternary ammonium surfactants or cationic polymers causes immediate electrostatic coacervation and sticky precipitation. Always pair Sodium Alkyl Naphthalene Sulfonate Condensate with anionic, nonionic, or compatible amphoteric co-formulants where anionic sulfonate groups remain in molar excess.

What is the melting point, boiling point, density, and viscosity of Sodium Alkyl Naphthalene Sulfonate Condensate?
Dry Sodium Alkyl Naphthalene Sulfonate Condensate powder does not melt prior to charring/decomposition above 260–320 °C (true skeletal density 1.48–1.65 g/cm3; bulk pour density 380–620 g/L). Commercial 40%–45% w/w aqueous liquid concentrates have a specific gravity of 1.18–1.26 g/cm3 at 20 °C, a boiling point of 102–106 °C, a freezing point of -5 to +2 °C, and a dynamic viscosity of 45 to 220 mPa·s at 25 °C.

Why do bags of Sodium Alkyl Naphthalene Sulfonate Condensate powder cake if left open, and does caking ruin the product?
Spray-dried hollow powder spheres of Sodium Alkyl Naphthalene Sulfonate Condensate are hygroscopic and absorb ambient humidity (> 60% RH) to form surface bridges. Resealing polyethylene bag liners immediately prevents caking; if physical pressure caking occurs without chemical contamination, the lumps dissolve completely in water with no loss of dispersing power.

What first aid and PPE precautions apply when handling Sodium Alkyl Naphthalene Sulfonate Condensate?
Wear dust-tight safety goggles (EN 166), nitrile or butyl gloves, protective workwear, and an N95/FFP2 dust respirator when handling open powder bags. If Sodium Alkyl Naphthalene Sulfonate Condensate contacts the eyes, flush immediately with running water for at least 15 minutes and seek medical care; if on skin, wash with soap and water; if inhaled, move to fresh air.

What details should I include when requesting a Sodium Alkyl Naphthalene Sulfonate Condensate quotation from Ataman Kimya?
Specify your target application (agrochemical SC, WDG, WP, or SE; textile Dispersing Agent MF; pigment/carbon black slurry; ceramic slip; or concrete admixture), required CAS number (68425-94-5, 81065-51-2, or 9084-06-4), neat vs. wetting-blended grade, active content and maximum Na2SO4 limit, physical form (powder vs. 40% liquid), packaging format, and order quantity.

SODIUM ALKYL NAPHTHALENE SULFONATE CONDENSATE – TECHNICAL SUMMARY

Sodium Alkyl Naphthalene Sulfonate Condensate—known in Turkish as Sodyum Alkil Naftalin Sülfonat Kondensatı, Kondense Metil Naftalin Sülfonat Sodyum Tuzu, Sodyum Metil Naftalin Formaldehit Sülfonat, or Dispersiyon Ajanı MF, and identified globally under CAS No. 68425-94-5, CAS No. 81065-51-2, CAS No. 9008-63-3, and CAS No. 9084-06-4 (EC No. 614-476-8 / 270-115-0 / 617-192-2)—is a water-soluble, strongly anionic polymeric dispersant and rheological modifier with the representative repeating unit formula (C11H9O3SNa·CH2O)n and a weight-average molecular weight (Mw) of 1,200 to 6,000 g/mol (n = 2 to 15). Synthesized via the sulfonation of methyl- and short-chain alkyl-naphthalene fractions, acid-catalyzed methylene-bridging polycondensation with formaldehyde, and sodium hydroxide neutralization, this functional polyelectrolyte anchors irreversibly onto hydrophobic crystal faces via pi-pi aromatic stacking while projecting ionized sulfonate groups (-SO3- Na+, pKa < -1.5) into water to generate a high negative zeta potential (-40 to -65 mV) across pH 1.0 to 13.5.

Supplied as a free-flowing light-to-dark brown spray-dried powder (85.0% to 95.0% active sulfonate condensate, bulk pour density 380 to 620 g/L, true density 1.48 to 1.65 g/cm3, thermal decomposition > 260 to 320 °C, and sodium sulfate controlled from <= 1.5% in ultra-low-salt grades to <= 5.0%–10.0% in standard grades) or as a 38.0% to 45.0% w/w aqueous liquid concentrate (density 1.18 to 1.26 g/cm3, viscosity 45 to 220 mPa·s at 25 °C), Condensed Methyl Naphthalene Sulfonate Sodium Salt serves as the benchmark primary dispersant, wet-milling aid, and Ostwald ripening inhibitor in agrochemical Suspension Concentrates (SC), Water Dispersible Granules (WDG / WG), Wettable Powders (WP), Suspo-Emulsions (SE), and Seed Treatments (FS). Beyond crop protection, Sodium Methyl Naphthalene Sulfonate Formaldehyde Condensate (Dispersing Agent MF) stabilizes high-temperature (130–140 °C) disperse and vat textile dyeing, aqueous organic pigment and carbon black slurries, high-solids ceramic and gypsum wallboard pastes, synthetic rubber emulsion polymerizations, leather tanning baths, and high-range water-reducing concrete superplasticizers.

For technical grade selection, benchmark cross-referencing, product availability, Technical Data Sheet (TDS), Safety Data Sheet (SDS), and batch Certificate of Analysis (COA) documentation, or to request a commercial quotation for Sodium Alkyl Naphthalene Sulfonate Condensate (Condensed Methyl Naphthalene Sulfonate Sodium Salt, Alkyl Naphthalene Sulfonate Condensate, or Dispersing Agent MF) tailored to your formulation and packaging requirements, you can contact Ataman Kimya directly through the communication channels below. Our technical sales team will gladly assist you in matching the optimal agrochemical SC/WDG/WP, textile dye, pigment, ceramic, or construction dispersant specification to your production process.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com