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Chemical Name: Cyclohexenyltrichlorosilane
Common Synonyms: Cyclohexenyltrichloro-silane
CAS Number: 17832-57-2
Hazard Classes: Acute oral toxicity, skin corrosion, serious eye damage, respiratory tract irritation, environmental hazard to aquatic life
Hazard Statements: Contact with moisture releases hydrogen chloride gas; vapors cause severe burns to eyes, skin, and mucous membranes; ingestion may lead to systemic toxicity
Signal Word: Danger
Pictograms: Corrosive, Health Hazard, Environment
Hazards: Causes severe skin burns and eye damage; exposure to vapors or direct contact with the substance can destroy tissue and has the potential to trigger asthma-like reactions in sensitive individuals; environmental exposure demands caution due to toxic impact on aquatic organisms
Active Substance: Cyclohexenyltrichlorosilane (over 95 percent)
Hazardous Components: Trichlorosilane fragments; impurity levels usually consist of trace amounts of hydrochloric acid developed upon contact with moisture
Classification: Corrosive and environmentally hazardous due to organosilicon-halide structure
Inhalation: Move affected person to fresh air immediately; respiratory distress calls for urgent medical help
Skin Contact: Remove contaminated clothing, rinse skin with plenty of running water for at least 15 minutes
Eye Contact: Rinse cautiously with clean water for several minutes, keeping eyelids apart to flush thoroughly, seek emergency medical care
Ingestion: Rinse mouth, do not induce vomiting, seek medical attention without delay as the substance can cause gastrointestinal burns
Comments: Any exposure requires urgent evaluation; burns may appear late, making proactive first aid and early treatment critical
Suitable Extinguishing Media: Dry powder or carbon dioxide; avoid water use directly on the product
Hazards: Hydrolysis liberates hydrogen chloride gas; combustion produces toxic fumes of silicon oxides and corrosive gases
Protective Gear: Self-contained breathing apparatus and full protective equipment
Special Tactics: Approach from upwind; contain runoff to prevent entry into sewers and waterways; cool containers exposed to flame from a safe distance
Personal Precautions: Wear chemical-resistant gloves, splash goggles, and respiratory protection; restrict access to spill area
Environmental Precautions: Prevent substance from entering soil, water systems, or drains to reduce harm to aquatic organisms
Containment Methods: Absorb small spills with inert material like sand or earth; collect in container for safe disposal
Decontamination: Wash area with large quantities of water following neutralization; ventilate spill site thoroughly
Safe Handling: Avoid inhalation of vapors or dust, avoid direct contact with liquid; always handle in chemical fume hood with appropriate PPE
Incompatible Materials: Moisture, water, strong bases, strong oxidizers; exposure to moisture generates corrosive hydrochloric acid fumes
Storage Recommendations: Store tightly closed in a cool, well-ventilated and dry location; keep away from heat sources, food, and incompatible materials
Transfer Recommendations: Use only non-sparking, corrosion-resistant equipment in transfer operations; avoid static discharge, ground all containers
Engineering Controls: Use in well-ventilated or mechanically exhausted settings to keep airborne concentrations below exposure limits
Eye/Face Protection: Chemical safety goggles and face shield
Skin Protection: Impervious gloves, chemical-resistant clothing including sleeves and apron
Respiratory Protection: If exposure risk exists above limits, wear respirators with acid gas cartridges or supplied air
General Hygiene: Wash thoroughly after handling, no eating or smoking in work area, remove contaminated clothing immediately
Appearance: Colorless to pale yellow liquid with pungent, acrid odor
Boiling Point: Around 220°C (estimate based on structure)
Melting Point: Not clearly established, expected below room temperature
Solubility: Reacts violently with water; not miscible
Vapor Pressure: Moderate at room temperature, exact numbers difficult to provide without laboratory analysis
Density: 1.2–1.3 g/cm³
Flash Point: Data not widely published
Stability: Decomposes in moist air, releases hydrochloric acid
Other: Fumes strongly when exposed to air, especially in humid conditions
Chemical Stability: Unstable in presence of water or moisture; hydrolyzes rapidly with evolution of heat and corrosive fumes
Reacts With: Water, alcohols, amines, strong bases, and oxidizers; contact rapidly initiates decomposition, increasing explosion risk
Hazardous Decomposition Products: Hydrogen chloride, silicon oxides, possible chlorinated organics depending on burning conditions
Polymerization: Will not occur under recommended storage and handling conditions
Acute Effects: Inhalation causes burning of respiratory tract, risk of pulmonary edema; skin and eye contact leads to immediate burns, potential for permanent damage
Chronic Effects: Prolonged exposure may cause dermatitis, respiratory symptoms, or sensitization in rare cases
Ingestion: Causes burns to mouth, esophagus, and stomach with risk of perforation
Other: No data suggesting carcinogenic, reproductive, or mutagenic effects from animal studies, but acute corrosive toxicity is primary hazard
Aquatic Toxicity: Highly toxic to aquatic organisms, especially fish and invertebrates; contamination leads to rapid acidification of water and destruction of gill membranes
Persistence & Degradability: Hydrolyzed quickly on contact with moisture to non-persistent byproducts, but immediate impacts can be severe
Bioaccumulation: Low risk given breakdown products are non-lipophilic and water reactive
Other Environmental Hazards: Use and storage near natural water sources or drains presents serious risk of contamination at all stages of the chemical’s life cycle
Recommended Method: Collect waste in sealed, labeled drums, treat with neutralizing silicate or alkaline media before handing off to licensed chemical waste contractors
Sewer Disposal: Prohibited due to corrosivity and aquatic toxicity
Other Notes: National and local hazardous waste legislation must be respected; avoid evaporation or flushing with water which creates significant fume hazards
Hazard Class: Classified as a dangerous good for road, air, and marine transport
Packing Group: II (indicating medium danger)
Proper Shipping Name: Organosilicon compound, liquid, corrosive
Special Handling Instructions: Leaking containers must be isolated and secured; all shipments require clear hazard labeling on exterior surfaces; keep incompatible materials segregated during transit
Workplace Regulation: Occupational exposure limits and handling rules set by agencies like OSHA or EU REACH regulate workplace use
Labeling: Requirement for GHS-compliant pictograms, hazard statements, and safety measures on all containers
Import/Export Controls: Falls under regional hazardous substance import/export regulations; reporting and tracking obligations in place in most industrialized countries
Use Restrictions: Banned from consumer applications, permitted only in controlled industrial processes under supervision of trained chemical handlers
