Product Name: Polyfunctional Sulfur Silane
Recommended Use: Coupling agent in rubber and tire manufacturing
Chemical Family: Organosilane, Sulfur-containing silane
CAS Number: 40372-72-3
Supplier: Mainstream industrial chemical distributors and manufacturers
Emergency Contact: Local poison control center or chemical manufacturer response line
Hazard Classification: Skin irritation, eye irritation, respiratory tract irritation, environmental hazard to aquatic life
Label Elements: Signal word: Warning; hazard symbols: exclamation mark and environment
Hazard Statements: Causes skin and eye irritation, may cause respiratory irritation, harmful to aquatic life with long lasting effects
Precautionary Statements: Wash exposed areas thoroughly after handling, avoid breathing dust or vapors, use in a well-ventilated area, avoid release to environment
Potential Health Effects: Repeated skin exposure leads to dryness or cracking, inhalation can cause coughing or throat discomfort, redness and pain upon eye contact
Chemical Identity: Tris[3-(triethoxysilyl)propyl] tetrasulfide
Molecular Formula: C18H42O6S4Si3
Typical Purity: 97-99%
Other Components: Ethanol (trace amounts from hydrolysis), proprietary stabilizers
Impurities: Unreacted silane monomers up to 2%
Inhalation: Move person to fresh air, support breathing if needed, seek medical advice for persistent symptoms
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, see a physician for irritation or persistent discomfort
Eye Contact: Rinse gently with water for at least 15 minutes, lift eyelids to ensure thorough irrigation, obtain medical attention without delay
Ingestion: Rinse mouth with water, do not induce vomiting, seek medical advice immediately
Delayed Effects: Sensitization of skin or lungs can develop with prolonged or repeated exposure
Suitable Extinguishing Media: Dry chemical, foam, carbon dioxide, water fog
Unsuitable Media: Direct water jet may spread burning liquid
Specific Hazards: Combustion produces oxides of carbon, sulfur oxides, silicon dioxide, toxic gases
Special Protective Equipment: Wear self-contained breathing apparatus and full fire protective clothing
Firefighting Procedures: Use water spray to cool containers, avoid breathing fumes, evacuate area if necessary
Personal Precautions: Use skin, eye, and respiratory protection, evacuate unnecessary personnel
Environmental Precautions: Prevent entry into sewers, surface waterways, and soil
Containment Methods: Absorb with inert material such as sand or clay, contain large spills with dikes
Cleanup Procedures: Scoop up and place in properly labeled containers, wash area with detergent and water, ventilate affected zone thoroughly
Safe Handling: Avoid direct contact with skin, eyes, or clothing; use local exhaust ventilation
General Hygiene: Wash hands before eating or drinking, avoid inhaling vapor or dust
Storage Conditions: Store in tightly closed original containers, keep in a cool, dry, well-ventilated area separated from strong oxidizing agents and acids
Incompatibilities: Moisture, strong bases, oxidizing chemicals; reacts with water to produce ethanol over time
Special Precautions: Keep container tightly sealed and labeled
Occupational Exposure Limits: Not established for product; observe recommended workplace exposure limits for similar silane chemicals
Engineering Controls: Local exhaust ventilation, process enclosures
Respiratory Protection: Use NIOSH-approved organic vapor respirator when exposure may exceed recommended levels
Eye Protection: Chemical splash goggles
Skin and Body Protection: Impervious gloves (nitrile or neoprene), long-sleeved garments, chemical-resistant apron
Hygiene Measures: Do not eat, drink, or smoke in work area; wash thoroughly after handling
Appearance: Pale yellow to amber liquid
Odor: Faint mercaptan or sulfur odor
Odor Threshold: Not determined
Melting Point: Not applicable; remains liquid at low temperatures
Boiling Point: 220-250°C
Flash Point: > 93°C (closed cup)
Evaporation Rate: Not determined
Flammability: Combustible liquid
Vapor Pressure: Low at ambient temperatures
Density: 1.08-1.13 g/cm³ (20°C)
Solubility: Insoluble in water; hydrolyzes slowly
Auto-ignition Temperature: >300°C
Decomposition Temperature: Not determined
pH: Not applicable
Viscosity: 3-6 mPa·s (25°C)
Chemical Stability: Stable under recommended storage conditions
Reactivity: Reacts with water and moisture to form silanols and ethanol; generates heat
Hazardous Reactions: Contact with acids or bases accelerates hydrolysis; strong oxidizers may cause exothermic reactions
Decomposition Products: Silicon dioxide, carbon oxides, sulfur oxides, other irritating fumes
Polymerization: No hazardous polymerization expected under normal conditions
Routes of Exposure: Skin contact, eye contact, inhalation, ingestion
Acute Toxicity: Oral LD50 (rat) > 2000 mg/kg; inhalation toxicity low at ambient temperatures
Skin Corrosion/Irritation: Causes moderate skin irritation
Eye Damage/Irritation: Causes severe eye irritation, risk of corneal injury
Respiratory Sensitization: May cause irritation to nose, throat, lungs with repeated exposure
Chronic Effects: Prolonged or repeated exposure to vapor or mist may cause respiratory symptoms
Carcinogenicity/Mutagenicity: No data showing carcinogenic or mutagenic effects in available studies
Other Information: Persons with sensitive skin or pre-existing respiratory conditions may experience aggravated symptoms
Ecotoxicity: Harmful to aquatic organisms, long lasting effects on daphnia and fish observed in laboratory studies
Persistence and Degradability: Slow hydrolysis in water forms silanols and ethanol; silanols polymerize to inert silica
Bioaccumulation: Unlikely due to rapid hydrolysis
Mobility in Soil: Binds to organic matter, limited mobility once reacted
Other Adverse Effects: Uncontrolled release can affect aquatic habitats and cause oxygen depletion in small water bodies
Waste Handling: Follow all local, regional, and national regulations for chemical waste
Product Disposal: Incinerate in approved facility; do not pour down drains or into environment
Contaminated Packaging: Triple-rinse containers and send to licensed drum recycler or reconditioner
Special Precautions: Avoid releases to sewer systems, prevent residue build-up in waste containers by proper cleaning
UN Number: Not regulated as a hazardous material by ground, air, or sea in most countries
Proper Shipping Name: Polyfunctional sulfur silane, not otherwise specified
Hazard Class: Non-regulated for most transport scenarios
Packing Group: Non-applicable
Special Precautions: Keep containers closed, secure during transport, protect from extreme temperatures
Inventory Status: Listed on TSCA (USA), EINECS (Europe), DSL (Canada), AICS (Australia)
Workplace Classification: Subject to workplace exposure guidelines for organic silanes in many countries
SARA Title III: Not listed as extremely hazardous or toxic chemical
California Proposition 65: Does not contain chemicals known to cause cancer, birth defects, or reproductive harm
Other Requirements: Risk assessment and safety training required for users; Safety Data Sheet must be accessible in workplace under OSHA and EU CLP rules
