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CHEMICAL IDENTIFICATION & NOMENCLATURE
IUPAC Name: Sodium 2-methylnaphthalene-1-sulfonate (predominant isomer in commercial mixture)
Common Name: Sodium methylnaphthalenesulfonate (monomeric)
CAS Registry Number: 26264-58-4 (for the commercial isomeric mixture)
EC Number: 247-556-3
EINECS Number: 247-556-3
UN Number: Not regulated
Synonyms:
Sodium methylnaphthalenesulphonate (UK spelling),Sodium methylnaphthalenesulfonate (US spelling),Sodium 2-methyl-1-naphthalenesulfonate (major component),Sodium 1-methyl-2-naphthalenesulfonate,Sodium monomethylnaphthalenesulfonate,Morwet D-425,Dispersant SS,Lomar PW,Setamol WS,Norfox SNS
Important Note on Spelling: "Sulphonate" is British English spelling, "sulfonate" is American English. They are chemically identical. Regulatory documents use both spellings interchangeably.
Chemical Family: Alkylarylsulfonate surfactant
Molecular Formula: C₁₁H₉NaO₃S
Molecular Weight: 244.24 g/mol (for pure C₁₁H₉NaO₃S)
Chemical Structure: Commercial product is a complex mixture containing:
Primary: Sodium 2-methylnaphthalene-1-sulfonate (60-70%)
Secondary: Sodium 1-methylnaphthalene-4-sulfonate (20-30%)
Minor: Other positional isomers (1-methyl-5/6/7-sulfo, etc.)
Byproducts: Unsulfonated oil (1-3%), disulfonates (5-10%), sodium sulfate (10-25%)
INDUSTRIAL & COMMERCIAL APPLICATIONS
5.1. Agrochemical Formulations (Primary Market - 40% of consumption)
Formulation Type, Function, Typical %, Benefit
Wettable Powder (WP), Dispersant, anti-caking, 1-3%, Prevents hard packing, improves suspension
Suspension Concentrate (SC), Suspending agent, 0.5-2%, Prevents sedimentation, redispersibility
Water-Dispersible Granule (WG), Binder, dispersant, 2-5%, Granule strength with quick disintegration
Emulsifiable Concentrate (EC), Co-emulsifier, 1-2%, Improves emulsion stability
Specific Examples:
Glyphosate WP: 2% improves suspension rate >95%
Chlorpyrifos SC: 1.5% prevents hard settling for 2 years
Atrazine WG: 3% provides 10-second disintegration
5.2. Textile Industry Applications (25% of consumption)
Dyeing Processes:
Disperse Dye Leveling: 0.5-1.5 g/L in HT dyeing (130°C)
Reduces barriness from structural variations in polyester
Dye Transfer Agent: In continuous dyeing ranges
Printing Paste Additive: 1-2% for pigment printing
Performance Data:
Dye Uptake Improvement: +10-15%
Leveling Index Improvement: 4→5 (AATCC scale)
Wash Fastness: Unaffected or slightly improved
5.3. Construction Materials (15% of consumption)
Application, Function, Dosage, Effect
Gypsum Slurry, Dispersant, 0.1-0.3%, Reduces water demand 15-20%
Cement Grouts, Plasticizer, 0.2-0.5%, Improves flow, reduces shrinkage
Ceramic Slips, Deflocculant, 0.2-0.8%, Lowers viscosity, improves casting
Carbon Black Slurry, Wetting agent, 1-3%, Prevents floating, improves dispersion
5.4. Other Industrial Applications:
Leather Processing: 0.5-1% in dyeing, improves penetration
Paper Industry: 0.1-0.5% as dispersant for coatings
Oilfield Chemicals: 2-5% in drilling mud additives
Photographic: Emulsion stabilizer in film production
Formulation Compatibility Matrix:
Component, Compatibility, Notes
Anionic Surfactants, Excellent, LAS, AES, etc.
Non-ionic Surfactants, Good, NP-9, AE-7, etc.
Cationic Surfactants, Poor, Forms insoluble complexes
Inorganic Salts, Good, High tolerance
Polymers (PVA, CMC), Good to Fair, Test for viscosity effects
Oxidizing Agents, Fair, Avoid strong oxidizers
Reducing Agents, Good, Sulfites, bisulfites
6. REGULATORY STATUS & CERTIFICATIONS
Global Regulatory Approvals:
United States:
EPA: Listed in TSCA Inventory; FIFRA 40 CFR 180.960 - Exempt from tolerance as inert in pesticide formulations
FDA: 21 CFR 178.3400 - Emulsifiers/stabilizers for PVC food contact; 176.170 - Paper coatings
USDA: BioPreferred® designation (part of biobased product catalog)
European Union:
REACH: Registered 2010, no SVHC listing
EFSA: Not evaluated as food additive
BPR: Not classified as biocidal
CLP Regulation: Not classified as hazardous
Other Regions:
China: IECSC listed, GB 2760 not listed (not food additive)
Japan: MITI listed, not in Japan's Positive List
Australia: AICS listed, NICNAS registered
Industry Certifications:
ISO 9001: Quality management systems
ISO 14001: Environmental management
OHSAS 18001/ISO 45001: Occupational health & safety
Responsible Care®: Chemical industry initiative
8. HANDLING, STORAGE & TRANSPORTATION
Storage Specifications:
Temperature: 5-35°C (powder), 0-40°C (solution, avoid freezing)
Humidity: <75% RH (powder to prevent caking)
Light: Protect from direct sunlight
Container: Original sealed packaging
Shelf Life: 24 months (powder), 12 months (40% solution)
Stacking: Maximum 5 high for 25 kg bags
SAFETY INFORMATION ABOUT SODIUM METHYLNAPHTHALENESULPHONATE
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
