Product Name: Monosulfur Silane
Chemical Formula: C8H18OS2Si
Synonyms: Bis(3-triethoxysilylpropyl)monosulfide
Recommended Use: Coupling agent, adhesion promoter, rubber additive
Supplier Information: Contact chemical provider directly, include address and emergency phone number
CAS Number: 56706-10-6
Classification: Flammable liquid (Category 3), Skin irritant (Category 2), Eye damage (Category 1), Acute toxicity oral (Category 4), Hazardous to aquatic life (Category 2)
Hazard Statements: Contains flammable liquids and vapors; harmful if swallowed; causes skin irritation; causes serious eye damage; toxic to aquatic life with long-lasting effects
Pictograms: Flame, Exclamation Mark, Corrosion, Environment
Precautionary Statements: Keep away from heat, sparks, open flames; avoid breathing fumes; wash exposed area thoroughly after handling; use only outdoors or in well-ventilated area; prevent release to environment
Signal Word: Danger
Chemical Identity: Monosulfur Silane
Chemical Family: Organosilane
Concentration: ≥97% by weight
Impurities: Triethoxysilane derivatives, organosulfur fragments (≤2%)
EC/EINECS Number: 260-350-7
Other Constituents: Trace solvents, residual moisture
Inhalation: Move person to fresh air, keep comfortable, monitor for coughing or shortness of breath; seek medical attention if symptoms persist or worsen.
Skin Contact: Remove contaminated clothing, rinse skin with water, wash with soap, watch for redness or blistering; seek care if irritation continues.
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present, continue rinsing; immediate medical attention required for burning or blurred vision.
Ingestion: Rinse mouth, do not induce vomiting, call poison control center or physician; keep patient calm.
Most Important Symptoms: Burning eyes, red or cracked skin, abdominal pains, dizziness. Immediate hazards focus on eye damage, chemical burns, and possible respiratory distress.
Suitable Extinguishing Media: Foam, carbon dioxide, dry chemical powder or water fog (do not use direct water jets).
Specific Hazards: Vapors form explosive mixtures with air, combustion releases irritating and toxic gases including oxides of carbon, silicon dioxide, and sulfur oxides.
Special Protective Equipment: Firefighters use self-contained breathing apparatus, full protective gear.
Advice for Firefighters: Isolate area, fight fire from a safe distance, cool containers exposed to fire with water spray, stop leak if possible without risk.
Unusual Fire/Explosion Hazards: Vapors heavier than air, can migrate along ground and flashback; containers may rupture in fire conditions due to pressure buildup.
Personal Precautions: Evacuate area, ventilate, wear chemical splash goggles, gloves, and flame-resistant clothing, avoid breathing vapors.
Environmental Precautions: Prevent spill from entering drains, waterways, or soil.
Containment Methods: Dike area with inert materials such as sand or earth, limit spread.
Cleanup Procedures: Absorb spill with non-combustible absorbent, shovel collected material into compatible chemical waste containers, label for hazardous waste disposal.
Additional Measures: Notify local authorities of large releases or where there is risk to environment or public health.
Handling Practices: Use only in well-ventilated areas, keep containers tightly closed when not in use, avoid contact with skin, eyes and clothing, ground/bond container and receiving equipment during transfer to prevent static discharge.
Hygiene Requirements: Wash hands and face thoroughly after handling, remove contaminated clothing and launder before reuse.
Storage Conditions: Store in cool, dry, well-ventilated place away from heat, sparks, open flames; use corrosion-resistant containers with tight-sealing lids; keep away from oxidizing agents, strong acids and bases.
Storage Class: Flammable liquid.
Packaging Materials: Use original packaging or approved chemical storage containers; do not reuse empty containers for food or drink.
Control Parameters: No established exposure limits; monitor air quality for vapor buildup. Maintain workplace concentrations below recommended levels at all times.
Engineering Controls: Use explosion-proof ventilation and local exhaust, provide eyewash and safety shower stations.
Personal Protective Equipment: Wear goggles or face shield, chemical-resistant gloves (nitrile, neoprene), flame-retardant coveralls, chemical-resistant apron for high risk or repeated exposure.
Respiratory Protection: If insufficient ventilation, wear approved respirator with organic vapor cartridge or supplied air respirator.
Environmental Controls: Use containment and local exhaust to prevent release to air or effluent; monitor for leaks or spills near sensitive environmental receptors.
Appearance: Clear to pale yellow liquid
Odor: Mild, sulfurous
Odor Threshold: Not measured
pH: Not applicable (non-aqueous liquid)
Melting Point: <-40°C (liquid at room temperature)
Boiling Point: 290°C (decomposition possible)
Flash Point: 79°C (closed cup)
Evaporation Rate: Slow
Flammability: Flammable
Vapor Pressure: <1 hPa at 20°C
Vapor Density: Heavier than air
Relative Density: 1.06 g/cm³ at 20°C
Solubility: Hydrolyzes in water, insoluble in water after reaction, soluble in many organic solvents (alcohol, ether)
Partition Coefficient (n-octanol/water): No data
Auto-ignition Temperature: 265°C
Decomposition Temperature: >200°C
Viscosity: Moderate, 3-10 mPa·s at 25°C
Chemical Stability: Stable under normal storage, sensitive to moisture.
Conditions to Avoid: Avoid exposure to heat, flames, static discharge, direct sunlight, and humidity.
Incompatible Materials: Strong acids, strong alkalies, oxidizing agents, water (causes hydrolysis).
Hazardous Decomposition Products: Oxides of sulfur, silicon dioxide, carbon monoxide, carbon dioxide, ethanol (on hydrolysis).
Polymerization: Not expected under recommended usage.
Reactivity: Undergoes slow hydrolysis in water, releases alcohol vapor.
Acute Toxicity: LD50 (oral, rat): 1,200–1,800 mg/kg
Skin Corrosion/Irritation: Causes moderate to severe skin irritation
Serious Eye Damage/Irritation: Causes severe eye injury; can damage cornea
Respiratory or Skin Sensitization: No reliable data, but precaution for possible skin sensitization
Mutagenicity/Carcinogenicity: Not classified as mutagenic or carcinogenic based on available data
Long-term Effects: Prolonged contact dries and cracks skin; absorbed vapors can affect nervous or digestive systems
Other Information: Risk from combined exposure to other chemicals; symptoms may be delayed, including headache, nausea, vomiting, dizziness
Aquatic Toxicity: Harmful to aquatic organisms; long-lasting harmful effects in rivers, lakes, and soil
Persistence and Degradability: Slow hydrolysis in water breaks chemical into less harmful components, but initial product persistent in sediments
Bioaccumulation Potential: Not known to biomagnify, but limited biodegradation
Soil Mobility: Binds to organic matter, limited leaching through soil layers
Other Adverse Effects: Toxic effects increase in poorly ventilated, humid, or low dilution environments
Precaution for Wildlife: Contamination risks in agricultural areas, especially with repeated or high-quantity use
Product Disposal: Treat as hazardous waste, send to certified chemical disposal or incineration facility; do not pour down drain or landfill
Container Disposal: Triple-rinse empty containers, puncture or crush before offering for recycling or disposal; follow local, national regulations
Special Instructions: Avoid mixing with other chemical waste streams
Precautions: Notify authorities for spills or improper disposal; keep records of disposal in compliance with environmental regulations
UN Number: 1993
UN Proper Shipping Name: Flammable liquid, n.o.s. (Monosulfur Silane)
Transport Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Marine Pollutant: Yes
Special Precautions: Keep container upright, avoid rough handling, label freight clearly; emergency response information must accompany shipment; comply with ADR/RID, IMDG, IATA regulations as appropriate
EU Regulation: Classified under CLP Regulation (EC) No. 1272/2008
OSHA HazCom: Hazardous chemical subject to 29 CFR 1910.1200
SARA Title III: Not listed under Sections 302, 304, or 313
TSCA Status: Listed on United States TSCA Inventory
REACH Status: Registration required in the EU
WHMIS Classification: Class B2 (Flammable Liquid), Class D2B (Toxic Material)
Other Regulations: Follow all relevant chemical safety, environmental, and transportation codes; consult specific national or local authorities for current regulations on use, storage, and disposal.
