Product Name: Bis[3-(Triethoxysilyl)Propyl]Tetrasulfide
Synonyms: Silane coupling agent, TESPT
Chemical Family: Organosilane, sulfur-containing
Molecular Formula: C18H42O6S4Si2
Molecular Weight: 538.98 g/mol
Recommended Use: Rubber additive, adhesion promoter, reinforcing agent
Supplier Information: [Insert manufacturer contact and emergency phone number, as required by regulations]
CAS Number: 40372-72-3
Classification: Flammable liquid (Category 4), Skin irritation (Category 2), Eye irritation (Category 2A), Specific target organ toxicity single exposure (Category 3 – respiratory irritation)
Signal Word: Warning
Hazard Statements: Causes skin irritation, causes serious eye irritation, may cause respiratory irritation, combustible liquid
Pictograms: Exclamation mark
Precautionary Statements: Avoid breathing vapors; wear protective gloves, goggles, and clothing; use only outdoors or in well-ventilated area; keep away from heat, sparks, and open flames; no smoking
Potential Health Effects: Inhalation may cause cough, dizziness, sore throat; skin contact may cause redness, dryness or cracking; eye contact produces pain and redness; may cause headache, nausea upon overexposure.
Substance: Bis[3-(Triethoxysilyl)Propyl]Tetrasulfide
CAS Number: 40372-72-3
Concentration: >98% by weight
Impurities: May contain trace amounts of related organosilane compounds, ethanol formed by hydrolysis, and elemental sulfur at low levels
Other Additives: Typically none, but commercial products may have stabilizers or inhibitors as listed by the manufacturer.
Inhalation: Move person to fresh air; call a physician if symptoms persist, provide oxygen if breathing is difficult, do not leave affected person unattended; monitor for delayed symptoms such as headache or difficulty breathing.
Skin Contact: Remove contaminated clothing, wash affected area with plenty of water and mild soap, seek medical advice if irritation or redness develops, launder clothing before reuse.
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present and easy to do, continue rinsing, seek medical attention if irritation persists.
Ingestion: Rinse mouth, do not induce vomiting, never give anything by mouth to an unconscious person, seek immediate medical attention.
Suitable Extinguishing Media: Use dry chemical foam, carbon dioxide, alcohol-resistant foam, or water spray; avoid using full water jet as product may float.
Specific Hazards: Vapors may form explosive mixtures with air, combustion can produce irritating and toxic fumes including oxides of sulfur, silicon oxides, carbon oxides.
Fire-Fighter Protection: Wear self-contained breathing apparatus and full protective gear to prevent inhalation of toxic gases; cool containers with water from a safe distance to prevent pressure buildup.
Special Instructions: Contain runoff to prevent entry into waterways, fight fire from upwind position, evacuate downwind personnel if necessary.
Personal Precautions: Evacuate non-essential personnel, ventilate area, avoid personal contact, wear suitable protective clothing, chemical-resistant gloves, and goggles.
Environmental Precautions: Prevent further leaks or spillage if safe to do so, avoid discharge into drains, watercourses, or soil.
Containment and Clean-up: Absorb spill with inert material such as sand, earth, or vermiculite, place in chemical waste container for disposal; wash spill area with detergent and water after cleanup; ventilate area and avoid vapor inhalation.
Handling: Use only in well-ventilated spaces; avoid contact with eyes, skin, and clothing; avoid inhalation of vapor or mist; keep away from sources of ignition; use static discharge protection; do not use near heat or open flame; employ personal protective equipment as described.
Storage: Store in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible substances; segregate from oxidizing agents, strong acids, and bases; keep containers tightly sealed when not in use; label containers properly; avoid storage conditions that expose material to moisture or direct sunlight due to risk of hydrolysis and degradation.
Engineering Controls: Provide adequate general and local exhaust ventilation to keep vapor levels below recommended limits; use explosion-proof equipment in flammable areas.
Exposure Limits: No permissible exposure limits (OSHA/ACGIH) established for the pure product; in practice, maintain air concentrations as low as possible through proper ventilation.
Personal Protection: Wear chemical splash goggles, face shield if splashing likely, nitrile or butyl rubber gloves, long-sleeved clothing, chemical-resistant apron or suit for high volume handling; use appropriate respiratory protection (NIOSH-approved respirator) if engineering controls do not maintain airborne concentrations below exposure limits; maintain eye-wash stations and safety showers nearby.
Hygiene Measures: Wash hands before breaks and at end of shift, remove contaminated clothing and wash before reuse, avoid eating, drinking, or smoking during use.
Appearance: Pale yellow to yellow liquid
Odor: Slight mercaptan, sulfurous
Odor Threshold: Not determined
pH: Not applicable (non-aqueous)
Melting Point/Range: <-40°C
Boiling Point/Range: 220–255°C at atmospheric pressure
Flash Point: Approximately 108°C (closed cup)
Evaporation Rate: Slower than water
Flammability: Combustible liquid
Vapor Pressure: <0.01 mmHg at 20°C
Vapor Density: Heavier than air
Relative Density: 1.11–1.14 g/cm³ at 25°C
Solubility: Insoluble in water, reacts to form ethanol and silanols; soluble in most organic solvents
Partition Coefficient (n-octanol/water): Not determined
Autoignition Temperature: >250°C
Decomposition Temperature: Not established
Viscosity: 8–20 mPa·s at 25°C
Chemical Stability: Stable under recommended storage and handling conditions; hydrolyzes on exposure to moisture, yielding ethanol and silanols
Reactivity: Reacts with water or moisture to produce ethanol; incompatible with strong acids, bases, oxidizers
Hazardous Polymerization: Product does not polymerize under normal handling
Hazardous Decomposition Products: Thermal decomposition can release sulfur oxides, silicon dioxide, carbon oxides, and ethanol
Conditions to Avoid: Heat, ignition sources, moisture, prolonged exposure to air
Incompatible Materials: Strong acids, strong bases, strong oxidizing agents
Likely Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Toxicity: Low oral and dermal toxicity in animal models; inhalation of high concentration vapor or mist may irritate respiratory passage
Skin Irritation: Causes irritation or redness on prolonged or repeated contact
Eye Irritation: Severe irritation on direct contact
Chronic Effects: No known chronic toxicity or carcinogenicity based on available data; repeated skin exposure may cause dermatitis
Symptoms: Eye pain, redness, skin inflammation, coughing, sore throat, headache, nausea at high doses
Mutagenicity, Carcinogenicity, Reproductive Toxicity: No significant evidence available to suggest mutagenic, carcinogenic, or reproductive hazard under normal use levels
Sensitization: Prolonged contact may cause sensitivity in susceptible individuals
Aquatic Toxicity: Low to moderate hazard for aquatic life; LC50 (fish, 96hr) reportedly >100 mg/L
Persistence and Degradability: Product hydrolyzes rapidly in presence of moisture, generating ethanol and silanol by-products – these degrade further in environment
Bioaccumulation: Not expected to bioaccumulate due to hydrolysis and low water solubility
Mobility in Soil: Low mobility; adheres to organic matter in soils and sediments
Other Adverse Effects: Ethanol resulting from hydrolysis may contribute to localized oxygen depletion in water; observe caution to prevent large releases.
Waste Treatment Methods: Treat waste as hazardous material; dispose of in accordance with local, federal, and regional regulations
Incineration: Suitable method for disposal with appropriate pollution control devices
Container Disposal: Triple rinse empty containers, puncture and dispose at approved chemical waste site; do not reuse container
Precautions: Avoid release to the environment, observe all label recommendations during disposal
Additional Guidelines: Coordinate with licensed chemical waste disposal contractor to ensure compliance with environmental requirements.
UN Number: UN3082 (if shipped under environmental hazard regulations)
Proper Shipping Name: Environmentally hazardous substance, liquid, n.o.s. (Bis[3-(Triethoxysilyl)Propyl]Tetrasulfide)
Transport Hazard Class: 9
Packing Group: III
Labels Required: Miscellaneous Dangerous Goods (Class 9)
Special Precautions: Ensure container integrity, secure against tipping, avoid loading near food or animal feed; comply with all hazardous material transport rules per IATA, IMDG, and DOT regulations
Marine Pollutant: Yes, classify as marine pollutant if transported in bulk
Other Information: Non-bulk quantities may be regulated as non-hazardous for transport, but always verify with most current transport codes.
Inventory Status: Listed on TSCA (US), EINECS/ELINCS (EU), ENCS (Japan), AICS (Australia), DSL/NDSL (Canada)
OSHA Hazards: Irritant, combustible liquid
SARA Title III (Sections 311/312): Immediate (Acute) health hazard, Fire hazard
EPCRA (Section 313): Not listed as a toxic chemical subject to reporting
California Prop 65: Not listed as a known carcinogen or reproductive toxin
REACH Status: Registered substance under REACH Annex VI; subject to specific workplace control measures
Other Regulations: Observe all site-specific health, environmental, and handling guidelines based on product application and jurisdiction.
