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Product Name: Octyltrichlorosilane
Chemical Formula: C8H17Cl3Si
Synonyms: Trichloro(octyl)silane, N-Octyltrichlorosilane
CAS Number: 5281-04-9
Recommended Use: Surface treatment, silanization agent, laboratory chemical
Supplier: Chemical supply companies, research laboratories
Contact Numbers: Safety, emergency, and spill hotlines provided by the manufacturer
Emergency Overview: Colorless to pale yellow liquid, strong irritating odour
Main Hazards: Causes severe skin burns and eye damage, lung irritation possible after inhalation, reacts violently with water
Signal Word: Danger
Hazard Statements: Corrosive to eyes, skin, and respiratory tract; harmful if swallowed, may cause delayed lung injury
Precautionary Statements: Do not ingest, avoid contact with skin or eyes, use only in well-ventilated areas, keep away from moisture
Chemical Name: Octyltrichlorosilane
CAS Number: 5281-04-9
Concentration: 98% or higher (may vary with supplier)
Additional Ingredients: Minor quantities of impurities, including hydrochloric acid evolved upon contact with water or moisture
Impurity Information: Chlorinated by-products may be present below 1%
Skin Contact: Immediately flush skin with plenty of running water for at least 15 minutes while removing contaminated clothing. Seek medical attention without delay.
Eye Contact: Promptly rinse eyes with copious amounts of water, lifting eyelids occasionally. Continue rinsing for at least 20 minutes and get immediate medical care.
Inhalation: Remove person to fresh air. If breathing becomes difficult, give oxygen and call for medical help. If respiration stops, perform artificial respiration.
Ingestion: Do not induce vomiting. Rinse mouth with water. Seek immediate medical advice.
Most Important Symptoms: Burns to skin and eyes, severe irritation or damage to respiratory tract, coughing, shortness of breath.
Suitable Extinguishing Media: Dry sand, dry chemical powder, foam designed for chemical fires. Avoid water contact.
Unsuitable Extinguishing Media: Water and water spray (produces corrosive and toxic gas)
Specific Hazards: Decomposes to release hydrogen chloride gas and silicon oxides
Protective Equipment: Firefighters should wear full protective gear and self-contained breathing apparatus.
Advice for Firefighters: Evacuate area, control run-off to prevent environmental contamination, use caution due to corrosive gases.
Personal Precautions: Evacuate unnecessary personnel, wear splash-resistant goggles, chemical-resistant gloves, and protective clothing.
Environmental Precautions: Prevent chemical from entering sewers, surface water, or soil.
Clean-up Methods: Neutralize spill with dry lime or soda ash, collect dry residue in containers with a tight-fitting lid. Ventilate area.
Special Instructions: Do not use water for clean-up; avoid inhalation of vapors during remediation.
Handling: Use only in a chemical fume hood. Wash hands and face thoroughly after handling. Open containers with caution to prevent splashing.
Storage: Store in tightly closed containers under inert gas, keep away from moisture and water, store in a cool, dry, well-ventilated area constructed with corrosion-resistant materials.
Incompatible Materials: Reacts with water, alcohols, amines, oxidizing agents.
Packaging: Use containers specifically designed to handle strong corrosive liquids.
Exposure Limits: No established OSHA PEL or ACGIH TLV for Octyltrichlorosilane; limit exposure as with corrosive substances.
Engineering Controls: Use chemical fume hood, ensure area air exchange and local exhaust.
Respiratory Protection: Use NIOSH-approved respirator when vapors are present or accidental release occurs.
Skin Protection: Wear butyl rubber or neoprene gloves, chemical-resistant aprons, lab coats.
Eye Protection: Safety goggles plus full-face shield.
Hygiene Measures: Do not eat, drink, or smoke during use. Thorough cleaning recommended after handling.
Appearance: Colorless to pale yellow, clear liquid
Odor: Sharp, irritating
Molecular Weight: 267.67 g/mol
Boiling Point: 112-115°C at 2 mm Hg
Melting Point: Not established, typically below ambient temperature
Vapor Pressure: 2.5 mm Hg at 20°C
Solubility: Reacts with water, decomposes
Density: 1.02 g/cm³ at 20°C
Flash Point: 80°C (closed cup, may vary with method)
Autoignition Temperature: Not determined
Percent Volatile: 100% as supplied
Chemical Stability: Stable in sealed containers under dry, inert conditions. Decomposes rapidly upon contact with water or moist air.
Hazardous Reactions: Violent hydrolysis creating hydrogen chloride fumes, heat, and silanols.
Conditions to Avoid: Water or humidity, strong oxidizing agents, extreme heat.
Hazardous Decomposition Products: Hydrogen chloride, siloxanes, and silicon oxides.
Polymerization: Not expected under typical storage and handling practices.
Routes of Exposure: Absorption through skin and eyes, inhalation of vapors, ingestion
Acute Effects: Severe skin and eye burns. Inhalation may cause coughing, pulmonary edema, chemical pneumonitis.
Chronic Effects: Long-term exposure may lead to scarring or respiratory complications.
Toxicological Data: Not fully established for Octyltrichlorosilane. Similar chlorosilane compounds are highly corrosive with low LD50 values (oral, rat LD50 typically <200 mg/kg).
Cancer, Mutagenic, Reproductive Effects: No established evidence in public sources, but no chronic testing available.
Environmental Fate: Hydrolyzes rapidly in water to octylsilanetriol and hydrogen chloride.
Ecotoxicity: Harmful to aquatic organisms due to corrosive nature, acute toxicity to fish and invertebrates not available.
Persistence: Rapid transformation, breakdown to inorganic and organosilicon products.
Bioaccumulation: Not expected to bioaccumulate due to hydrolysis.
Other Adverse Effects: Releases acid and organosilicon compounds to the environment if not neutralized.
Waste Disposal Methods: Dispose of material in accordance with national and local regulations. Neutralize with care before disposal. Incinerate in approved chemical waste facility.
Container Disposal: Carefully triple rinse empty containers with suitable solvent and neutralize residue before discarding.
Precautions: Avoid direct disposal into waterways, sewage systems, or natural environments.
UN Number: UN 2987
Proper Shipping Name: Octyltrichlorosilane
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: I (high danger)
Marine Pollutant: No specific designation, but avoid spillage in marine settings.
Labeling Requirements: Corrosive hazard-labeling for road, rail, sea, and air shipments.
Special Provisions: Use corrosion-resistant packaging. Emergency response guides advised for spill management.
TSCA Status: Listed on United States Toxic Substances Control Act Inventory.
EINECS/ELINCS: Registered in the EU chemical inventory.
Hazard Symbols: C (Corrosive), Risk phrases for skin and respiratory damage.
SARA Title III: Not specifically listed, but HCl released during use may trigger reporting.
California Proposition 65: No listing for Octyltrichlorosilane.
Workplace Regulations: Subject to OSHA hazard communication standard. Employers must provide adequate training and personal protective equipment.
WHMIS Classification (Canada): D1B (Toxic material causing immediate and serious effects), E (Corrosive material).
Other Requirements: Emergency planning and community right-to-know rules may apply where large stocks are used.
