Product Name: Lsooctyltrichlorosilane
Chemical Formula: C8H17Cl3Si
CAS Number: 18173-47-8
Synonyms: Trichloro(octyl)silane, Octyltrichlorosilane
Recommended Use: Industrial chemical used in surface treatments, coatings, and as a silanizing agent
Supplier Information: Contact details provided by manufacturer or distributor
Emergency Contact: Refer to national emergency number, supplier emergency phone line
GHS Classification: Skin corrosion/irritation Category 1, Serious eye damage/eye irritation Category 1, Specific Target Organ Toxicity – Single Exposure Category 3, Corrosive to metals Category 1
Label Elements: Signal Word: Danger, Pictograms: Corrosive (GHS05), Exclamation Mark (GHS07)
Hazard Statements: Causes severe skin burns and eye damage. May cause respiratory irritation. Harmful if inhaled, swallowed, or in contact with skin. Reacts violently with water.
Precautionary Statements: Avoid breathing dust/fumes/gas/mist/vapors/spray. Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. Wash skin thoroughly after handling.
Other Hazards: Hydrolysis may release hydrogen chloride gas which is corrosive to respiratory tract and mucous membranes.
Chemical Name: Lsooctyltrichlorosilane
Common Name: Octyltrichlorosilane
Concentration: 98-100%
CAS Number: 18173-47-8
Impurities and Stabilizing Additives: May contain trace amounts of related organosilicon compounds and unreacted trichlorosilane derivatives
Other Ingredients: No other intentionally added components in hazardous concentrations
Inhalation: Remove person to fresh air immediately. Keep individual warm and at rest. Seek immediate medical attention as pulmonary edema may develop rapidly after exposure.
Skin Contact: Remove contaminated clothing right away. Wash affected skin with plenty of water for at least 15 minutes. Seek medical attention even for minor skin contact as delayed burns may occur.
Eye Contact: Flush eyes thoroughly with water for at least 15 minutes, lifting eyelids occasionally. Remove contact lenses if present and easy to do. Seek prompt medical attention.
Ingestion: Do not induce vomiting. Rinse mouth with water. Never give anything by mouth to an unconscious person. Get emergency medical help.
Most Important Symptoms/Effects: Severe irritation and burns to all tissues contacted. Cough, sore throat, shortness of breath, delayed pulmonary edema, blurred vision, permanent eye injury are possible.
Immediate Medical Attention/Special Treatment: Symptomatic and supportive treatment as required. Consider risk of delayed lung effects.
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, foam. Use water spray only to cool containers; direct water contact with this chemical may generate corrosive gases.
Unsuitable Extinguishing Media: Do not use water jet on spillage or directly onto material.
Special Hazards: Upon combustion, produces toxic and corrosive gases such as hydrogen chloride, silicon oxides, and phosgene under extreme conditions.
Protective Equipment for Firefighters: Self-contained breathing apparatus (SCBA) and full protective clothing recommended.
Firefighting Procedures: Approach from upwind and evacuate area. Use caution to prevent contact of water with the chemical, as violent hydrolysis can occur.
Thermal Decomposition Products: Hydrogen chloride, silicon oxides, octyl derivatives
Personal Precautions: Wear chemical-resistant gloves, impermeable suit, boots, and chemical goggles. Use positive-pressure respiratory protection if airborne concentrations exceed occupational exposure limits.
Environmental Precautions: Prevent release into drains, surface water, or soil. Inform local environmental authorities in case of large spill.
Containment Methods: Stop leak if safe to do so; prevent vapors and liquid from spreading with inert absorbent materials like sand or vermiculite.
Cleanup Methods: Avoid direct contact. Secure area and ventilate. Absorb spillage and collect in suitable containers for chemical waste disposal. Wash residue with sodium bicarbonate or soda ash solution to neutralize.
Decontamination: Dispose of contaminated materials and cleanup supplies as hazardous waste, complying with local and international regulations.
Precautions for Safe Handling: Use in well-ventilated workspaces away from moisture. Open containers carefully. Minimize the generation of vapors and aerosols. Keep only in original, tightly closed containers.
Handling Advice: Avoid all personal contact. Do not breathe vapors or mist. Never add water directly to the chemical.
Conditions for Safe Storage: Store in cool, dry, well-ventilated location away from heat and open flames. Protect from moisture, air, and incompatible substances, such as strong bases and oxidizers.
Storage Temperature: Keep at ambient to low temperatures, recommended range 5-30°C.
Incompatibles: Reacts with water, strong oxidizers, bases, alcohols, amines.
Occupational Exposure Limits: No established exposure limits for the compound itself, but apply strict hygiene controls based on similar organosilicon chlorides and hydrogen chloride.
Engineering Controls: Local exhaust ventilation, process enclosure, or other engineering solutions to minimize exposure.
Personal Protective Equipment: Chemical-resistant gloves (nitrile, neoprene), splash-proof goggles or face shield, impervious clothing, chemical-resistant boots.
Respiratory Protection: When ventilation is inadequate, use full-face supplied-air respirator. For emergency or uncontrolled releases, use positive-pressure SCBA.
Hygiene Measures: Do not eat, drink, or smoke while handling this material. Wash hands and face thoroughly after handling.
Environmental Exposure Controls: Follow best practices to prevent release to environment. Monitor and control workplace concentrations.
Appearance: Clear, colorless to pale yellow liquid
Odor: Sharp, pungent, acrid odor similar to hydrochloric acid
pH (aqueous solution): Not applicable (reacts with water), hydrolyzes with evolution of HCl
Melting Point: -66°C
Boiling Point: 227°C
Flash Point: 99°C (closed cup, may vary with manufacturer data)
Evaporation Rate: Not determined
Flammability: Not highly flammable, may ignite at elevated temperatures and in presence of moisture
Vapor Pressure: 1.0 mmHg @ 25°C (approximate)
Vapor Density (air=1): 7.5 (calculated)
Relative Density: 1.004 g/cm³ at 25°C
Solubility: Decomposes in water, readily hydrolyzed
Decomposition Temperature: >200°C
Viscosity: Low to moderate, varies with temperature
Partition Coefficient (n-octanol/water): Not available, likely to be hydrophobic
Chemical Stability: Stable under recommended storage conditions in sealed containers.
Reactivity: Reacts vigorously with water, producing hydrogen chloride and flammable octylsilanol derivatives.
Possibility of Hazardous Reactions: Direct contact with water causes violent hydrolysis and heat release.
Conditions to Avoid: Moisture, high humidity, temperature extremes, open flames, direct sunlight.
Incompatible Materials: Water, strong oxidizers, bases, alcohols, amines.
Hazardous Decomposition Products: Hydrogen chloride, silicon oxides, chlorinated organics
Polymerization: Product does not undergo uncontrolled polymerization.
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Effects: Causes severe burns, respiratory tract irritation, and eye damage. Inhalation of vapors may result in lung injury or pulmonary edema. Delayed effects may occur.
Chronic Effects: Prolonged or repeated exposure may cause dermatitis, bronchitis, and permanent tissue damage.
Oral Toxicity (LD50): Data limited for Lsooctyltrichlorosilane. Related organosilane chlorides typically LD50 (rat): 100-1000 mg/kg.
Skin Corrosion/Irritation: Causes burns on contact.
Serious Eye Damage/Irritation: Severe burns and permanent vision loss possible.
Respiratory Sensitization: Possible due to HCl evolution.
Mutagenicity/Carcinogenicity/Reproductive Toxicity: Not classified, no reliable data in humans.
Other Information: Rapid hydrolysis releases hydrogen chloride, responsible for primary hazards.
Aquatic Toxicity: Harmful to aquatic life due to acidification from hydrolysis products. Data on direct toxicity is limited, but hydrogen chloride and silanol products present risks.
Persistence and Degradability: Rapidly hydrolyzes in water, forming octylsilanol and hydrochloric acid; these further degrade under environmental conditions.
Bioaccumulative Potential: Bioaccumulation unlikely due to rapid hydrolysis; original compound does not persist.
Mobility in Soil: High reactivity limits mobility; forms non-volatile degradation products in contact with moisture.
Other Adverse Effects: Large spills in water can cause a sharp drop in pH, harming aquatic organisms.
Waste Management: Treat as hazardous chemical waste. Collect and store in sealed, labeled containers.
Disposal Methods: Incinerate in approved chemical incinerator with afterburner and scrubber for acid gases. Do not discharge into drains, sewers, or waterways.
Contaminated Packaging: Decontaminate containers; rinse with neutralizing solution before final disposal. Dispose as hazardous waste according to national and local regulations.
Regulatory Requirements: Comply with chemical waste regulations as per EPA (or local equivalent), including transfer documentation and manifest submission.
UN Number: UN 2987
UN Proper Shipping Name: Trichlorosilane, N.O.S. (contains Lsooctyltrichlorosilane)
Transport Hazard Class: 8 (Corrosive)
Packing Group: II
Label: Corrosive
Transport Precautions: Use corrosion-resistant shipping containers, protect from moisture and physical damage. Segregate from incompatible goods such as oxidizers and bases. Follow emergency plans for accidental release and exposure.
Special Provisions: Notify carrier of hazardous nature before transport. Emergency response guide number: 157.
U.S. TSCA Status: Listed, subject to reporting and recordkeeping requirements.
SARA Title III: Acute Health Hazard
OSHA Hazard Communication: Hazardous Chemical under OSHA standard
REACH Registration (EU): May be subject to restrictions or authorization as per updates.
Canada DSL: Listed/subject to New Substance Notification, depending on end use
Other International Inventory Status: Check with local regulations for specific requirements (Australia AICS, China IECSC, Japan ENCS, Korea ECL, Philippines PICCS)
Labeling: Meets requirements for GHS signal words, pictograms, and hazard statements.
Worker Protection: Subject to workplace hazard communication and safety training requirements.
Environmental Release Reporting: Required in case of spills or accidental releases over threshold limits.
