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Chemical Name: Butyltrichlorosilane
Molecular Formula: C4H9SiCl3
Molecular Weight: 203.56 g/mol
Physical State: Colorless to pale yellow liquid known for its volatility and pungent odor
Common Uses: Seen in chemical synthesis, laboratory reagents, and organic surfactant chemistry
Main Hazards: Releases corrosive fumes on contact with moisture; vapor can irritate respiratory passages
Health Effects: Severe burns, eye damage, risk of chemical pneumonitis from inhalation
Signal Words: Danger — direct contact burns skin and eyes, fume inhalation harms lungs
GHS Classification: Skin corrosion, acute toxicity, serious eye damage, environmental hazard due to toxicity in aquatic environments
Ingredient: Butyltrichlorosilane - concentration close to pure form in laboratory or industrial applications
Impurities: Trace hydrolyzed products, related chlorosilanes if not pure batch
Eye Contact: Rinse gently with clean water for at least 15 minutes, do not rub eyes, seek medical help fast
Skin Contact: Remove contaminated clothing and rinse under running water, watch for blistering or burns
Inhalation: Carry person to fresh air, give oxygen if breathing is difficult; emergency attention vital for cough, tightness, or loss of consciousness
Ingestion: Do not induce vomiting, rinse mouth if conscious, emergency care needed
Suitable Extinguishing Media: Dry chemical powder, foam, or CO2
Hazardous Combustion Products: Hydrogen chloride, silicon oxides, and possibly other toxic gases form in fire
Specific Hazards: Spontaneous reaction with water, strong exotherm, high vapor hazards
Advice for Firefighters: Wear full protective suit, self-contained breathing apparatus, stop leak only if safe, keep run-off away from drains
Personal Protection: Chemical-resistant gloves, goggles, full shift coveralls and positive-pressure respirators
Environmental Precautions: Prevent entry to drains, waterways, or soil
Containment: Absorb spills with inert dry material like sand, scoop up residue into chemical waste container, ventilate area, isolate hazard zone
Handling: Work in well-ventilated fume hood, avoid breathing vapor, protect skin and eyes at all times
Storage: Store tightly closed containers in cool, dry, and well-ventilated place, keep away from water, alcohol, or bases, store in sealed glass or compatible plastic, keep shielded from ignition sources
Engineering Controls: Fume hood mandatory for open work, local exhaust for transfer or decanting
Personal Protective Equipment: Nitrile or neoprene gloves, splash-proof goggles, face shield, flame-retardant lab coat
Workplace Hygiene: No eating, drinking, or smoking in handling areas, thorough washing after tasks
Respiratory Protection: Use a NIOSH-approved respirator for airborne exposure above recommended limits
Appearance: Clear, colorless to light yellow liquid
Odor: Sharp, pungent
Boiling Point: Around 136-137°C
Melting Point: Not easily frozen at ambient conditions
Flash Point: About 30°C (closed cup)
Density: Approximately 1.09 g/cm³
Solubility: Reacts with water, forms hydrochloric acid, insoluble in aqueous solutions
Vapor Pressure: Moderately high, raises risk of inhalation exposure
Other Properties: Hydrolyzes rapidly releasing hazardous fumes, reacts violently with moisture
Chemical Stability: Unstable in presence of moisture, stable in dry, inert atmosphere
Conditions to Avoid: High humidity, water, alcohols, strong bases, acids, open flames
Incompatible Materials: Strong oxidizers, water, alcohols, bases, amines
Decomposition Products: Hydrogen chloride gas, siloxanes, possible other chlorinated by-products
Acute Toxicity: Corrosive to tissue, harmful if inhaled or ingested
Chronic Effects: Repeated exposure scars the skin, damages mucous membranes, chronic respiratory issues
Routes of Exposure: Inhalation, skin absorption, eye and oral exposure risk
Specific Effects: Severe irritation, burns, risk of blindness, pulmonary edema after inhalation
Environmental Impact: Toxic to aquatic life through hydrolysis and HCl formation
Persistence and Degradability: Hydrolyzes quickly, byproducts persistent depending on environment
Bioaccumulation: Not known to bioaccumulate significantly, but spillage risks acute damage to ecosystems
Mobility: High due to volatility, possible groundwater threat through breakdown products
Waste Disposal: Chemical destruction by trained professional using approved methods, don’t pour down drains or landfill
Container Disposal: Triple rinse with inert solvent, then follow strict hazardous waste protocols
Special Precautions: Label waste, don’t mix with incompatible chemicals, prioritize worker safety during disposal
Hazard Classification: Classified as dangerous goods for road, rail, air transport due to corrosivity and reactivity
Packing Group: Varies by quantity and concentration, usually group II — significant risk during spillage
Special Handling: Secure upright in leakproof containers, segregate from water-reactive or oxidizing chemicals, deliver Material Safety Data Sheet with shipment for responder/safety awareness
Regulation: Features on major international chemical control laws for hazardous substances
Labeling Requirements: Signal word “Danger”, hazard pictograms for corrosivity, toxicity, and environmental damage
Reporting Obligations: Incidents and spills must reach local safety regulators, required emissions reporting for environmentally significant releases
