Product Name: N-Trimethoxyoctylsilane
Chemical Formula: C11H26O3Si
CAS Number: 3069-40-7
Synonyms: n-Octyltrimethoxysilane; Trimethoxyoctylsilane
Recommended Use: Surface modifier, water repellents, adhesion promoter
Supplier: Chemical supply firm, contact information required on shipping label
Emergency phone: Emergency response number provided by supplier or regulatory body
Restrictions on use: Industrial and professional use only, not intended for personal care
Date of preparation: Most recent revision date reflected on current document
Hazard Classification: Flammable liquid, eye irritant, skin irritant, can cause specific target organ toxicity with prolonged exposure
GHS Label Elements: Pictograms showing flame and exclamation mark, indicating fire and health risks
Signal Word: Warning
Hazard Statements: Highly flammable liquid and vapor; can cause skin and eye irritation; prolonged breathing of vapors may cause drowsiness or dizziness
Precautionary Statements: Keep away from ignition sources; wear protective glove and eye protection; use only outdoors or in well-ventilated area; avoid release to environment
Other Hazards: Forms explosive mixtures with air; can release methanol by hydrolysis, which is toxic if inhaled or swallowed
Name: N-Trimethoxyoctylsilane
CAS Number: 3069-40-7
Concentration: 98-100%
Impurities: Trace methanol, possible siloxanes
Hazardous Components: Methanol may form by hydrolysis; classified as toxic with systemic effects
Additives: None intentionally added for most industrial batches
Inhalation: Remove affected person to fresh air, keep warm, and at rest; seek medical attention if symptoms such as headache, dizziness, nausea, or unconsciousness occur
Skin Contact: Remove contaminated clothing immediately; wash skin thoroughly with soap and water; seek medical attention if irritation persists or develops
Eye Contact: Rinse with plenty of water for at least 15 minutes; remove contact lenses if present and easy to do; continue rinsing; seek immediate medical advice if irritation or redness worsens
Ingestion: Rinse mouth, do not induce vomiting unless instructed by medical personnel; seek prompt medical attention especially if more than incidental amount is ingested or symptoms develop
Symptoms: May include burning sensation, coughing, difficulty breathing, redness or swelling of affected area, possible delayed effects from methanol
Suitable Extinguishing Media: Alcohol-resistant foam, dry chemical powder, carbon dioxide
Unsuitable Media: Direct water jet can spread burning liquid
Special Hazards: Vapors heavier than air, can travel to ignition source causing flashback; combustion releases carbon oxides, silicon oxides, and toxic methanol fumes
Protective Equipment: Firefighters require self-contained breathing apparatus and full protective clothing
Fire-Fighting Procedures: Evacuate area, contain runoff to prevent contamination of soil or waterways
Hazardous Combustion Products: Methanol, formaldehyde, carbon monoxide, carbon dioxide, silica dust
Personal Precautions: Remove ignition sources, ventilate area, wear proper gloves, goggles, chemical-resistant apron
Environmental Precautions: Prevent further leakage or spillage if safe to do so, keep out of drains, surface water, or soil
Containment: Use non-sparking tools, build dike with inert material such as dry sand or earth
Clean-Up Methods: Absorb with inert material and collect in suitable container for disposal; clean spill area with detergent and water
Notification Procedure: Notify proper authorities if significant release occurs or if waterway becomes contaminated
Handling: Use in well-ventilated place, avoid inhaling vapors, avoid contact with skin and eyes, use only non-sparking tools, ground/bond container and receiving equipment
Hygiene Measures: Wash hands after handling, remove contaminated clothing, do not eat, drink, or smoke while using this chemical
Storage Conditions: Store tightly closed in cool, dry, well-ventilated area away from direct sunlight, incompatible substances like acids, bases, oxidizers
Packaging Materials: Keep in original container, compatible with polyethylene or glass; avoid metal containers due to possible corrosion and reaction
Fire Precautions: Store away from heat, sparks, open flames, and hot surfaces
Occupational Exposure Limits: No specific limit for silane; methanol ACGIH TLV 200 ppm TWA, 250 ppm STEL
Engineering Controls: Local exhaust ventilation or general mechanical ventilation; explosion-proof equipment required in high volume usage
Personal Protection: Safety goggles or face shield, chemical-resistant gloves (nitrile or butyl rubber), flame-resistant laboratory coat, chemical splash apron
Respiratory Protection: Use approved respirator (organic vapor cartridge) if exposure limits are exceeded or if adequate ventilation is not available
Environmental Protection: Avoid release to environment; proper ventilation and regular inspection of storage area
Appearance: Colorless transparent liquid
Odor: Characteristic, pungent, alcohol-like
pH: Not applicable
Melting Point: -82°C
Boiling Point: 194°C (381°F)
Flash Point: 71°C (160°F) closed cup
Evaporation Rate: Slower than ether, faster than water
Flammability: Highly flammable liquid and vapor
Upper/Lower Flammability Limits: 0.9% (LEL), 6.0% (UEL by volume in air)
Vapor Pressure: 0.4 mmHg at 25°C
Vapor Density: Heavier than air (4.0)
Relative Density: 0.94 g/cm³ at 25°C
Solubility: Slightly soluble in water, reacts slowly forming methanol
Partition Coefficient (n-octanol/water): High, expected to bioaccumulate in fat tissues
Autoignition Temperature: 235°C (455°F)
Decomposition Temperature: Not available
Viscosity: 2-3 mPa·s
Molecular Weight: 234.42 g/mol
Chemical Stability: Stable under recommended storage conditions, reacts with water and humid air producing methanol
Reactivity: Reacts exothermically with water or moisture over time
Hazardous Reactions: Can react with strong acids, bases, strong oxidizers leading to hazardous decomposition
Conditions to Avoid: Sources of ignition, heat, strong acids, humidity, incompatible substances
Hazardous Decomposition Products: Siloxanes, methanol, silicon dioxide, formaldehyde in case of fire or thermal decomposition
Polymerization: Will not occur under normal conditions
Acute Toxicity: Oral LD50 (rat): > 2000 mg/kg; inhalation LC50 (rat, 4h): not fully established; dermal LD50 (rabbit): > 2000 mg/kg
Skin Corrosion/Irritation: May cause mild to moderate irritation on prolonged contact
Serious Eye Damage/Irritation: May cause redness, watering, pain and temporary impairment
Respiratory Sensitization: Inhalation of vapors may cause coughing, headache, dizziness, drowsiness
Skin Sensitization: Not expected to cause allergic reaction
Repeated Dose Toxicity: Prolonged exposure may cause liver, kidney, or central nervous system effects, especially due to methanol byproduct
Carcinogenicity: Not classified by IARC, NTP, OSHA as carcinogen
Mutagenicity: Not considered mutagenic
Reproductive Toxicity: Methanol is known to cause birth defects and reproductive harm
Symptoms of Overexposure: Headache, nausea, dizziness, blurred vision, abdominal pain, respiratory distress
Ecotoxicity: Not classified as highly toxic, may cause harmful effects to aquatic life in large quantities
Persistence and Degradability: Not readily biodegradable; hydrolyzes to methanol (which biodegrades rapidly) and siloxanes (which persist)
Bioaccumulative Potential: Partition coefficient suggests high potential for long-term accumulation in fatty tissues
Mobility in Soil: Limited mobility due to low water solubility; methanol byproduct is very mobile in groundwater
Other Adverse Effects: Contributes to ozone depletion potential is negligible; high vapor releases may affect air quality
Waste Treatment Methods: Incinerate with approved facility, use licensed chemical waste contractor
Disposal of Container: Empty containers must be triple-rinsed, then disposed according to local regulations
Prohibited Disposal: Do not discharge into drains, waterways, or soil
EPA Waste Code: D001 (Ignitable waste)
Additional Information: Compliance with all federal, state, and local environmental control regulations required
UN Number: UN 1993
UN Proper Shipping Name: Flammable Liquid, N.O.S. (N-Trimethoxyoctylsilane)
Transport Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Marine Pollutant: Not classified, but avoid release near aquatic environments
Special Precautions for Transport: Keep away from heat and open flames, use explosion-proof trucking or railcars, follow IMDG, IATA, or DOT regulations as appropriate
Transport Label: Flammable liquid
US TSCA: Listed
OSHA: Classified as hazardous; employees must receive right-to-know training
SARA Title III: Section 311/312 (Acute health, Fire hazard); Section 313 (Not listed)
California Prop 65: Methanol listed for reproductive toxicity
REACH (EU): Registration, evaluation, and authorization completed by supplier
Canada DSL/NDSL: Substance present on DSL
WHMIS Classification: B2 (Flammable liquid), D2B (Toxic material)
Other Regulation: Local chemical control laws, environmental release restrictions may apply
