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EXECUTIVE SUMMARY & TECHNICAL OVERVIEW
Product Identity: Sodium Methylnaphthalenesulfonate (Commercial Grade)
CAS Number: 26264-58-4 (Isomeric mixture)
EC Number: 247-556-3
Molecular Formula: C₁₁H₉NaO₃S (average)
Molecular Weight: 244.24 g/mol
Product Type: Anionic surfactant, dispersant, wetting agent
Appearance: Tan to brown free-flowing powder or amber viscous liquid
Primary Applications: Agrochemical formulations, textile processing, construction materials, industrial dispersions
Spectroscopic Identification:
UV-Vis Spectrum (1 mg/L in water):
λmax = 224 nm (ε ≈ 45,000)
λmax = 275 nm (ε ≈ 6,500)
Shoulder at 315 nm
FT-IR (KBr pellet, cm⁻¹):
1185: S=O asymmetric stretch
1040: S=O symmetric stretch
1125: C-S stretch
1605, 1505: Aromatic C=C
690, 745: Aromatic C-H out-of-plane
¹H NMR (D₂O, 400 MHz, δ ppm):
7.3-8.1: Multiplet, aromatic protons
2.65: Singlet, methyl protons (2-Me isomer)
2.75: Singlet, methyl protons (1-Me isomer)
DETAILED PHYSICAL & CHEMICAL PROPERTIES
Extended Property Database:
Physical State Properties:
Form: Hygroscopic powder, flakes, or viscous liquid
Color (Powder): Gardner 4-8 (tan to light brown)
Color (Solution): Hazen 100-300 (amber)
Odor: Faint aromatic, characteristic
Taste: Bitter, characteristic of sulfonates
Bulk Density: 0.48-0.65 g/cm³ (loose)
Tapped Density: 0.58-0.75 g/cm³
True Density: 1.45-1.55 g/cm³
Angle of Repose: 35-45° (good flow)
Compressibility: 15-25% (fair)
Hausner Ratio: 1.2-1.3 (acceptable)
Caking Tendency: Low to moderate (depends on humidity)
Thermal Properties:
Melting Behavior: Softens at 80-100°C, decomposes >250°C
Glass Transition (Tg): Not applicable (amorphous)
Thermal Conductivity: 0.18 W/m·K (powder)
Specific Heat: 1.3 J/g·K (25°C)
Heat of Solution: -15 to -25 kJ/mol (exothermic)
Flash Point (Powder): >150°C (not flammable)
Autoignition Temperature: >400°C
Dust Explosion Parameters:
MEC: 30-50 g/m³
MIT: >400°C
Kst: <10 bar·m/s (weak explosion)
Solution Properties:
pH (Various Concentrations):
0.1% solution: 8.0-8.5
1.0% solution: 8.5-9.0
10% solution: 9.0-9.5
40% solution: 9.5-10.5
Conductivity (1% aq., 25°C): 8.5-12.0 mS/cm
Viscosity Profile:
10% solution: 1.5-2.5 mPa·s
20% solution: 3-6 mPa·s
30% solution: 10-25 mPa·s
40% solution: 50-200 mPa·s
50% solution: 500-2000 mPa·s (may gel)
Refractive Index (20% solution): 1.368-1.372
Colloidal & Surfactant Properties:
Critical Micelle Concentration (CMC): 0.8-1.2 g/L (isomer dependent)
Micelle Aggregation Number: 18-25
Micelle Diameter: 2-4 nm
Krafft Point: <0°C (soluble at all practical temperatures)
Cloud Point: >100°C (no clouding in distilled water)
Hydrophile-Lipophile Balance (HLB): 12.5-13.5 (calculated)
Spreading Coefficient: 25-35 mN/m (on mineral oil)
Contact Angle Reduction:
Paraffin wax: 105° → 65°
Polyethylene: 95° → 50°
Glass: 40° → 15°
Chemical Reactivity & Stability:
pH Stability: Stable at pH 2-12 for >30 days
Thermal Stability:
<100°C: Stable indefinitely
100-150°C: Gradual decomposition (<5%/year)
150°C: Rapid decomposition
Oxidative Stability: Resistant to atmospheric oxygen
Photostability: DT₅₀ = 30-50 days in sunlight
Hydrolytic Stability: No hydrolysis at pH 4-10
Incompatibilities:
Cationic surfactants: Forms insoluble complexes
Strong oxidizers: May oxidize sulfonate
Polyvalent cations (Ca²⁺, Mg²⁺, Fe³⁺): Precipitation at high concentration
Compatibility: Excellent with anionic and non-ionic surfactants
SAFETY INFORMATION ABOUT SODIUM METHYLNAPHTHALENESULFONATE
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
