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Chemical Name: Methyltriethoxysilane
CAS Number: 2031-67-6
Common Names: Triethoxymethylsilane
Appearance: Clear, colorless liquid with a noticeable odor
Odor: Ethereal, potent
Health Risks: Skin and eye irritation after contact; inhalation leads to respiratory tract discomfort or damage
Fire Hazard: Flammable liquid and vapor; vapor may form explosive mixtures with air
Chronic Impact: Prolonged skin contact increases risk of dermatitis over time
Environmental Hazard: Toxic effect on aquatic life due to hydrolysis products including ethanol and silanols
GHS Label Elements: Flammable, Irritant
Main Ingredient: Methyltriethoxysilane (≥ 98%)
Impurities: Ethanol as result of hydrolysis; silanol derivatives may form upon exposure to water
Inhalation: Remove individual to fresh air promptly; breathe deeply; medical attention if discomfort persists; always prevent further exposure
Skin Contact: Wash with soap and water immediately; remove contaminated clothing promptly; seek medical help for severe irritation
Eye Contact: Flush eyes with clean water for several minutes; hold eyelids open and rinse thoroughly; consult a physician if irritation continues
Ingestion: Do not induce vomiting; rinse mouth thoroughly; seek immediate medical attention; never give anything by mouth to an unconscious person
Suitable Extinguishing Media: Use foam, dry chemical, carbon dioxide; never use water jet as it aggravates spread
Fire Risks: Fast vapor buildup in confined spaces; containers exposed to fire can rupture
Special Protective Equipment: Firefighters should wear self-contained breathing apparatus; use full protective gear to avoid exposure to fumes
Hazardous Combustion Products: Emits carbon monoxide, carbon dioxide, and silicon oxides; ethanol vapors present as secondary fire hazards
Personal Protection: Don chemical resistant gloves, goggles, and respirator if necessary; eliminate ignition sources instantly
Spill Cleanup: Absorb with inert material like sand or earth; scoop up and transfer to a chemical waste drum
Containment: Block entry into drains, soil, or surface waters; ventilate enclosed areas immediately
Handling: Ground and bond containers; transfer only in well-ventilated spaces; keep away from hot surfaces or ignition sources
Storage: Store in tightly closed containers in cool, dry, well-ventilated locations; keep out of sunlight and away from moisture
Separation: Segregate from strong oxidizers, acids, and water-reactive substances; never store in unlabeled containers
Engineering Controls: Use local exhaust ventilation to limit vapor accumulation
Personal Protective Equipment: Chemical-resistant gloves, safety glasses with side shields, flame-retardant lab coat or apron
Respiratory Protection: Use approved respirators in cases of insufficient ventilation; avoid breathing vapor or mist
Hygiene: Wash hands before eating or smoking; work clothing should not be taken home to prevent secondary exposure
Physical State: Liquid
Color: Clear, colorless
Odor: Characteristic, sharp
Boiling Point: Near 143°C (289°F)
Flash Point: Close to 41°C (105°F)
Vapor Pressure: Moderate at room temperature
Solubility: Reacts with water, forming gel; insoluble in water, soluble in organic solvents
Chemical Stability: Stable in closed containers under inert, dry atmosphere
Decomposition Risk: Rapid hydrolysis with water or moisture; releases flammable ethanol
Incompatible Substances: Strong acids, alkalis, oxidizers; water or alcohols trigger unwanted reactions
Hazardous Reactions: Exothermic reactions with water can cause overpressure; buildup in poorly ventilated spaces increases risk
Inhalation: Exposure can irritate throat, nose, cause coughing or dizziness
Skin Contact: Prolonged or repeated contact delivers redness, dryness, and cracking
Eye Contact: Pain, redness, and watering expected with even brief exposure
Ingestion: Harmful, causes nausea, vomiting, abdominal pain; risk of aspiration into lungs
Chronic Effects: Repeated exposure leads to defatting of skin; sensitization risk appears low but persistent dermatitis remains an issue for regular handlers
Toxicity: Hydrolysis products affect fish and aquatic invertebrates; ethanol release increases biological oxygen demand
Persistence: Silanol by-products might bind to soil or sediment; volatility keeps primary risk with vapor rather than groundwater
Bioaccumulation: Low potential; breakdown occurs quickly after contact with moisture
Mobility: Spilled product can enter surface water and spread rapidly due to low viscosity
Waste Disposal: Treat as hazardous waste; incinerate in authorized chemical disposal facilities; never allow to enter public sewers or open drains
Packaging Disposal: Rinse containers before recycling or disposal; never reuse empty drums for other purposes
Environmental Responsibility: Avoid all uncontrolled releases to the ecosystem; take part in chemical take-back or recycling programs when they exist
Shipping Name: Flammable liquid, n.o.s. (contains Methyltriethoxysilane)
Hazard Class: 3 (Flammable liquids)
Packing Group: II
Transport Risk: Strict limitations on air and sea shipment; leaky or damaged containers demand immediate containment
Labeling: Flammable Liquids symbol required on all shipments
Chemical Inventory Status: Listed or regulated in many national and regional chemical registries
Safety Directives: Subject to workplace safety rules for flammable, irritant substances; employee training and local emergency plans required
Restrictions: Use and transport subject to controls for industrial chemical hazards; labeling and documentation need to be scrupulously maintained for every lot
