Product Name: Iso-Octyltrimethoxysilane
CAS Number: 34396-03-7
Synonyms: Trimethoxy(octyl)silane; n-Octyltrimethoxysilane
Recommended Use: Surface modifier, water repellent, adhesion promoter in chemical processing, construction, coatings, plastics
Supplier: Industrial chemical suppliers, specialized distributors in silane coupling agents
Emergency Contact Number: Local poison control center or supplier emergency line, reference your region
Address: Check product label or local distributor information for specific address
Hazard Classification: Flammable liquids (Category 3), Skin irritation (Category 2), Eye irritation (Category 2A), Specific target organ toxicity - single exposure (Category 3)
Signal Word: Warning
Pictograms: Flame, Exclamation mark
Hazard Statements: Flammable liquid and vapor. Causes skin and serious eye irritation. May cause respiratory tract irritation.
Precautionary Statements: Avoid breathing vapor/mist. Keep away from heat/sparks/open flames. Wear protective gloves, clothing, and eye/face protection. Use only outdoors or in a well-ventilated area. Wash exposed areas after handling.
Routes of Exposure: Inhalation, Skin contact, Eye contact, Ingestion
Chemical Name: Iso-Octyltrimethoxysilane
Concentration: 97%–100%
Impurities: Methanol (<2%, formed by hydrolysis), trace unreacted raw materials or by-products
CAS Number: 34396-03-7
Molecular Formula: C11H26O3Si
Molecular Weight: 234.41 g/mol
Inhalation: Move to fresh air immediately. Keep person warm and at rest. If not breathing, give artificial respiration. Seek medical attention if symptoms persist.
Skin Contact: Remove contaminated clothing. Wash skin thoroughly with soap and water for at least 15 minutes. Use emergency shower if available. Seek medical attention for irritation or burns.
Eye Contact: Rinse thoroughly with water for 15 minutes, lifting eyelids occasionally. Remove contact lenses if present and continue rinsing. Seek medical evaluation.
Ingestion: Do not induce vomiting unless instructed by medical personnel. Rinse mouth with water. Call poison control center or physician immediately.
Suitable Extinguishing Media: Alcohol-resistant foam, dry chemical, carbon dioxide, water spray (do not use direct water stream on fire)
Specific Hazards: Vapors may form explosive mixtures with air. Containers may rupture under fire conditions. Methanol may be released on combustion.
Hazardous Combustion Products: Carbon oxides, silicon oxides, formaldehyde, methanol fumes
Protective Equipment for Firefighters: Full protective gear, self-contained breathing apparatus
Special Firefighting Procedures: Evacuate area. Prevent runoff into drains. Cool unopened containers with water spray.
Flash Point: 72°C (161°F) closed cup
Personal Precautions: Evacuate personnel to safe areas. Eliminate all ignition sources. Wear appropriate breathing protection, gloves, eye/face protection, protective clothing.
Environmental Precautions: Prevent entry into waterways, sewers, basements, or confined areas. Contain spill with dikes if possible.
Cleanup Methods: Absorb with inert material (earth, sand, vermiculite). Collect in containers for disposal. Wash spill residues with water and detergent. Provide ventilation in affected area.
Disposal: Treat collected material according to disposal regulations. Notify authorities if large spill enters public waters or environment.
Safe Handling: Only use in well-ventilated areas. Avoid contact with eyes, skin, and clothing. Do not breathe aerosol or vapor. Prevent static discharge. Keep away from incompatible materials like strong acids, bases, and oxidizing agents.
Storage: Store tightly closed in a cool, dry, well-ventilated area. Keep away from sources of ignition and heat. Store in original container, clearly labeled. Protect from direct sunlight and moisture.
Incompatible Materials: Strong oxidizers, acids, bases, moisture—alcohol may be released if contacted with water.
Special Storage Requirements: Use grounded/bonded storage and transfer equipment. Avoid storage above recommended temperatures (typically below 40°C).
Exposure Limits: No established occupational exposure limit for Iso-Octyltrimethoxysilane. Methanol ACGIH TLV: 200 ppm TWA, 250 ppm STEL
Engineering Controls: Local exhaust ventilation, process enclosure, proper ventilation to keep airborne concentrations below recommended limits
Personal Protection Equipment (PPE): Chemical-resistant gloves (nitrile, neoprene), splash goggles or safety glasses, impervious protective clothing, chemical-resistant shoes or boots
Respiratory Protection: Use NIOSH-approved respirator if exposure exceeds limits or in case of inadequate ventilation
Hygiene Measures: Wash hands and exposed skin after handling. Do not eat, drink, or smoke during use. Remove and wash contaminated clothing before reuse.
Appearance: Colorless liquid, clear
Odor: Mild, alcohol-like
Odor Threshold: No data available
pH: Not applicable (hydrolyzes in water)
Melting/Freezing Point: -80°C (-112°F)
Boiling Point: 246°C (475°F)
Flash Point: 72°C (161°F) closed cup
Evaporation Rate: No data available
Flammability: Flammable liquid
Vapor Pressure: <1 mmHg @ 20°C
Vapor Density: 7.7 (air=1)
Solubility: Reacts with water; soluble in organic solvents
Partition Coefficient (n-octanol/water): No data available
Auto-ignition Temperature: 230°C (446°F)
Decomposition Temperature: >250°C
Viscosity: 1.2 mPa.s at 25°C
Chemical Stability: Stable under recommended storage and handling conditions
Reactivity: Reacts with water, moisture, acids, and alkalis to produce methanol
Hazardous Polymerization: Not expected
Conditions to Avoid: Exposure to moisture, excessive heat, ignition sources
Incompatible Materials: Strong acids, strong bases, oxidizing materials
Hazardous Decomposition Products: Methanol, formaldehyde, silicon oxides, carbon oxides
Routes of Exposure: Inhalation, skin, eyes, ingestion
Acute Toxicity: LD50 Oral (rat) >2,000 mg/kg; LC50 Inhalation (rat) No data available; LD50 Dermal (rabbit) >2,000 mg/kg
Skin Corrosion/Irritation: Causes skin irritation
Eye Damage/Irritation: Causes serious eye irritation
Respiratory or Skin Sensitization: May cause respiratory tract irritation
Chronic Effects: Prolonged or repeated exposure may cause dryness or cracking of skin; chronic inhalation may cause respiratory irritation
Carcinogenicity: Not classified as a carcinogen by IARC, NTP, or OSHA
Other Effects: Methanol released by hydrolysis poses toxicity risk—can cause central nervous system depression, nausea, headache, dizziness in high concentrations
Ecotoxicity: Low acute aquatic toxicity expected; hydrolyzes to methanol and silanol, which may cause toxic effects in aquatic organisms at high concentrations
Persistence and Degradability: Hydrolyzes in contact with water to silanols and methanol; silanols further condense forming insoluble siloxanes
Bioaccumulative Potential: Not expected to bioaccumulate significantly
Mobility in Soil: Liquid may have moderate mobility; silanols adsorb to soil, methanol highly mobile and volatile
Other Adverse Effects: Methanol breakdown product can be oxygen-demanding, harmful in large spills
Additional Notes: Avoid release to environment, report major discharges per local regulations
Disposal Methods: Recover and reuse whenever possible. For waste disposal, follow local, regional, national, and international laws. Incineration in approved facility recommended. Contaminated packaging should be emptied and disposed of as hazardous waste.
Special Precautions: Avoid landfill or open burning of containers. Prevent contamination of surface and groundwater. Rinse containers thoroughly if recycling or reusing.
Uncleaned Packaging: Disposal should comply with governmental regulations. Triple rinse before disposal or recycling.
UN Number: UN1993
Proper Shipping Name: Flammable liquid, n.o.s. (contains Iso-Octyltrimethoxysilane)
Transport Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Labels: Flammable liquid
Environmental Hazard: Not classified as marine pollutant
Special Transport Precautions: Keep container tightly closed, upright, and secure during transport. Ensure transport vehicle is well-ventilated, away from heat and ignition sources. Follow emergency procedures in case of accidental spill during shipment.
OSHA (USA): Flammable liquid as defined by OSHA Hazard Communication Standard (29 CFR 1910.1200)
TSCA (USA): Listed on Toxic Substances Control Act Inventory
REACH (EU): Registered, subject to specific information requirements
WHMIS (Canada): Class B2: Flammable liquids
Japan ENCS & China IECSC: Listed
SARA Title III (USA): Not subject to Section 313 reporting; Methanol (decomposition) is listed
RoHS/ELV: No intentionally added heavy metals, meets requirements for electronics
Other: Conformity with local health, safety, and environmental regulations is required in all regions and industries where product is supplied, handled, or disposed.
