Product Name: N-Dodecyltrimethoxysilane
Synonyms: Dodecyltrimethoxysilane, n-Dodecyltrimethoxysilane
Chemical Formula: C15H34O3Si
CAS Number: 3069-21-4
Recommended Use: Surface treatment, coupling agent, hydrophobizing agent in construction and coatings
Manufacturer: Refer to packaging or SDS source
Contact Information: Use supplier emergency contact line for technical inquiries or exposures
Emergency Telephone Number: Check local regulations for chemical spill response or poison control
Physical State: Liquid
Color: Colorless to pale yellow
Odor: Mild aliphatic
Hazard Classification: Flammable liquids Category 3, Skin irritant Category 2, Eye irritant Category 2A
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor, causes skin and eye irritation, may cause respiratory irritation
Precautionary Statements: Avoid breathing vapors, use protective gloves and eye protection, keep away from heat and open flames, wash exposed skin after handling
Potential Health Effects: Irritation to eyes, skin, and respiratory system, prolonged exposure may increase severity, potential for central nervous system effects after inhalation of high concentrations
Environmental Effects: Harmful to aquatic life, risk of bioaccumulation in natural waters
Substance: N-Dodecyltrimethoxysilane
Chemical Formula: C15H34O3Si
CAS Number: 3069-21-4
Concentration: Over 97% by weight
Impurities and Stabilizing Additives: Typical impurities below 1%, minor content of methanol may be released upon hydrolysis
Other Information: No additional hazardous components above regulatory disclosure limits
General Advice: Move affected person from exposure area, provide fresh air
Inhalation: Remove to fresh air, assist breathing by trained personnel if necessary, seek medical advice if symptoms persist
Skin Contact: Wash thoroughly with soap and water, remove contaminated clothing and shoes, seek medical attention for persistent irritation
Eye Contact: Rinse cautiously with water for at least 15 minutes, hold eyelids open, do not rub, seek medical advice
Ingestion: Rinse mouth thoroughly, do not induce vomiting, seek medical attention immediately, never give anything by mouth to an unconscious person
Suitable Extinguishing Media: Use alcohol-resistant foam, dry chemical powder, or carbon dioxide, use water spray only to cool containers and not for extinguishing flaming pools
Unsuitable Extinguishing Media: Avoid water jets due to the risk of spreading burning liquid
Specific Fire Hazards: Combustible, forms toxic and irritating fumes including silicon oxides and carbon oxides when burning
Special Protective Equipment: Fire-fighters require self-contained breathing apparatus, full protective clothing
Fire-Fighting Instructions: Isolate close proximity, prevent run-off of contaminated water, cool sealed containers with water spray to avoid rupture due to heat
Personal Precautions: Ventilate area, remove ignition sources, use gloves, goggles, and an organic vapor respirator as needed
Environmental Precautions: Block spillage from entering drains, waterways, or soil, alert environmental authorities if release occurs
Containment Methods: Dike spill with sand or inert absorbent, avoid materials that react with silanes
Cleanup Procedures: Absorb residue with inert material, sweep up and collect for safe disposal, decontaminate area with compatible solvent and water, ventilate area after cleanup
Notification Procedures: Report as required by local, state, or federal spills regulations
Safe Handling: Work in well-ventilated areas, avoid inhalation and skin contact, ground and bond containers when pouring, keep away from sparks and open flames
Safe Storage: Store in original, tightly sealed containers out of direct sunlight in a cool, dry, well-ventilated area, segregate from oxidizing agents and acids
Avoid: Water, moisture, strong acids and bases, oxidizing chemicals
Incompatibilities: Hydrolyzes rapidly upon exposure to moisture, forming methanol
Storage Temperature: 5°C to 35°C recommended
Other Precautions: Use explosion-proof equipment and non-sparking tools, ensure containers are labeled and checked for damage or leaks
Occupational Exposure Limits: No established limits for N-Dodecyltrimethoxysilane, possible exposure to methanol upon hydrolysis (OSHA PEL: 200 ppm TWA, ACGIH TLV: 200 ppm TWA)
Engineering Controls: Use with local exhaust ventilation, fume hood, process enclosures if necessary
Personal Protective Equipment: Safety goggles or face shield, chemical-resistant gloves (nitrile or neoprene), long-sleeved clothing, chemical-resistant apron, organic vapor respirator if exposure is possible
Hygiene Measures: Wash hands before breaks and after work, do not eat, drink, or smoke near this product, clean spills immediately to avoid slipping hazards
Environmental Controls: Collect and treat air emissions if possible, contain waste to prevent run-off into sewers or environment
Physical State: Liquid
Color: Colorless to pale yellow
Odor: Mild, aliphatic
pH: Not applicable, hydrolyzes in presence of water
Melting Point/Freezing Point: -22°C (approximate)
Boiling Point: 290°C (estimated)
Flash Point: 105°C (closed cup, approximate)
Evaporation Rate: Not measured
Flammability: Flammable liquid
Vapor Pressure: <1.0 mmHg at 25°C
Vapor Density: Not determined
Relative Density: 0.90-0.92 g/cm³ at 25°C
Solubility: Reacts with water, soluble in most organic solvents
Partition Coefficient (n-octanol/water): Not determined
Auto-ignition Temperature: >200°C
Decomposition Temperature: Not available
Viscosity: 4-6 cP at 25°C
Chemical Stability: Stable under recommended conditions, hydrolyzes in the presence of water or moisture
Conditions to Avoid: Exposure to moisture, extreme heat, open flames, oxidizing agents
Incompatible Materials: Strong acids, bases, oxidizers, water, alcohols
Hazardous Decomposition Products: Methanol, silicon oxides, carbon oxides
Hazardous Reactions: Reaction with water liberates methanol and forms silanols that condense to insoluble siloxane polymers
Storage Stability: Sensitive to moisture, keep container tightly closed when not in use to avoid contamination and hazardous decomposition
Acute Toxicity: Oral LD50 (rat) >2,000 mg/kg, inhalation LC50 not well defined, expected to be low toxicity
Skin Corrosion/Irritation: Causes irritation, redness and possible inflammation
Serious Eye Damage/Irritation: Moderate to severe eye irritation possible
Respiratory Sensitization: Vapors or mists may cause respiratory tract irritation, coughing, or discomfort
Skin Sensitization: Not known to cause sensitization, repeated contact may worsen irritation
Mutagenicity/Carcinogenicity: No evidence or classification available
Target Organs: Skin, eyes, respiratory system
Chronic Effects: No reliable data on chronic exposure, but prolonged contact may increase severity of irritant symptoms
Other Information: Methanol formed through hydrolysis is acutely toxic and can cause serious systemic effects
Ecotoxicity: Harmful to aquatic organisms, may cause long-term adverse effects in water environments
Persistence and Degradability: Hydrolyzes rapidly in water, forming silanol and methanol, silanol products further condense to insoluble substances
Bioaccumulation Potential: Bioaccumulation unlikely due to rapid hydrolysis, methanol residue may be of concern
Mobility in Soil: Unstable in moist conditions, likely to bind to soil or partition into water systems as hydrolysis proceeds
Other Adverse Effects: Large uncontrolled releases may disrupt biological treatment processes and water ecosystems
Waste Treatment Methods: Neutralize with suitable absorbent, incinerate in chemical incinerator with afterburner and scrubber
Container Disposal: Use licensed waste disposal company, triple-rinse empty containers prior to recycling or disposal according to local regulations
Precautions for Disposal: Avoid discharge into drains or watercourses, handle all contaminated materials and rinseate as hazardous waste if regulations require
Other Instructions: Consult local hazardous waste disposal guidelines, avoid dispersal of spilled or contaminated material
UN Number: 1993
UN Proper Shipping Name: Flammable Liquid, N.O.S. (n-Dodecyltrimethoxysilane)
Transport Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Labeling Requirements: Flammable Liquid symbol, UN1993
Marine Pollutant: Yes, according to IMDG
Special Precautions: Secure and check containers for leaks, keep away from incompatible substances, store upright, protect from mechanical impact and rough handling
Transport in Bulk: Refer to guidelines for bulk shipments, ensure sufficient ventilation and containment
Safety, Health and Environmental Regulations: Subject to international, federal, state, and local regulations for flammable and hazardous chemicals
OSHA: Classified as hazardous under OSHA Hazard Communication Standard
TSCA: Listed in the U.S. Toxic Substances Control Act Inventory
EPCRA / CERCLA: Not reportable under US EPA Emergency Planning and Community Right-to-Know regulations
SARA Title III: Not subject to specific SARA Section 313 notification
REACH: Registered or pre-registered in the European Union
WHMIS (Canada): B2 Flammable Liquid, D2B Toxic Material
Other National/International Regulations: Check country-specific occupational, transport, and environmental regulations for flammable organic silanes
