Product Name: N-Hexadecylmethyldimethoxysilane
Chemical Formula: C19H42O2Si
Chemical Family: Alkylalkoxysilanes
Synonyms: 1-Hexadecyl-1-methyl-1,1-dimethoxysilane
CAS Number: 18794-84-8
Recommended Use: Surface treatment, hydrophobic coatings, chemical intermediate
Supplier Name: Chemical supply chain companies and manufacturers
Contact Information: Refer to supplier’s emergency phone and address
GHS Classification: Flammable liquids (Category 3), Skin irritation (Category 2), Eye irritation (Category 2A), Specific target organ toxicity – single exposure (Category 3)
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor, causes skin irritation, causes serious eye irritation, may cause respiratory irritation
Pictograms: Flame, exclamation mark
Routes of Exposure: Inhalation, eye contact, skin contact
Potential Health Effects: May irritate skin or eyes, may cause coughing and discomfort if inhaled, ingestion may lead to gastrointestinal distress
Environmental Impact: Harmful to aquatic organisms in concentrated spillage
Chemical Name: N-Hexadecylmethyldimethoxysilane
Common Name: Not widely used
Concentration: 100% (pure substance)
Impurities: Traces of methanol possible from hydrolysis
Additives: No known additives
Inhalation: Move person to fresh air, keep at rest, support breathing if necessary, seek medical attention for symptoms like coughing, dizziness, or difficulty breathing
Skin Contact: Wash with soap and plenty of water, remove contaminated clothes, seek medical help if rash, redness, or irritation develops
Eye Contact: Rinse gently with water for at least 15 minutes, remove contact lenses, avoid rubbing eyes, consult an ophthalmologist if irritation persists
Ingestion: Rinse mouth, do not induce vomiting, give water if conscious, get immediate medical care for large ingestion or if symptoms appear
Key Symptoms: Stinging, burning sensation, nausea, headache, difficulty breathing, persistent coughing
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, do not use water jet directly
Specific Hazards: Vapors may form explosive mixture with air, combustion can generate toxic fumes like silicon oxides and carbon oxides
Protective Equipment: Wear self-contained breathing apparatus, chemical-resistant suit, avoid direct smoke inhalation
Other Information: Cool exposed containers with water spray, remove ignition sources nearby, evacuate area as needed
Personal Precautions: Wear suitable protective gear including gloves, splash goggles, and respirator if ventilation is inadequate, prevent contact with skin and eyes
Environmental Precautions: Prevent entry into waterways, drains, and soil, notify authorities if spill causes significant contamination
Methods for Cleanup: Absorb with non-combustible material like sand or vermiculite, collect in suitable containers for disposal, ventilate area well, avoid creating dust or vapor clouds
Handling: Work in well-ventilated places, avoid breathing vapors, avoid spill and splashes, do not eat, drink, or smoke during use, wash hands thoroughly after handling
Storage: Store in tightly closed containers in a cool, dry, well-ventilated spot, keep away from heat, sparks, open flames, prevent static discharge, segregate from oxidizers and strong acids
Special Considerations: Do not store in aluminum or galvanized containers, keep container labels visible and readable at all times
Occupational Exposure Limits: No specific limits established, use industry standards for similar organosilanes
Engineering Controls: Use local exhaust ventilation, enclosure techniques where possible, maintain eyewash stations and safety showers
Personal Protective Equipment (PPE): Wear chemical-resistant gloves made of nitrile or neoprene, safety goggles, chemical apron, and in case of inadequate ventilation, use a vapor respirator
Environmental Exposure Controls: Collect rinsate and spillage for disposal, avoid emissions into the environment by using closed systems when possible
Appearance: Colorless to pale yellow liquid
Odor: Mild, characteristic
Odor Threshold: Not available
pH: Not applicable
Melting/Freezing Point: -
Boiling Point: Approx. 325°C (617°F)
Flash Point: About 120°C (closed cup)
Evaporation Rate: Slow
Flammability: Flammable liquid
Upper/Lower Flammability Limits: Data not determined
Vapor Pressure: Low at 20°C
Vapor Density: Higher than air
Relative Density: About 0.83–0.85 g/cm³
Solubility: Insoluble in water
Partition Coefficient n-octanol/water: Not available
Autoignition Temperature: Not specified
Decomposition Temperature: Not specified
Viscosity: Not available
Chemical Stability: Stable under recommended handling and storage conditions
Reactivity: Hydrolyzes in presence of water or moisture to release methanol
Conditions to Avoid: Contact with strong acids, strong oxidizing agents, extreme heat, open flames, and moisture
Hazardous Decomposition Products: Methanol, silicon oxides, carbon oxides
Polymerization: No hazardous polymerization expected
Routes of Entry: Inhalation, skin contact, eye contact, ingestion
Acute Toxicity: No detailed LD50 or LC50 data for pure substance is widely published; comparable alkylsilanes have LD50 (oral, rat) above 2000 mg/kg
Chronic Effects: Repeated skin exposure may cause dryness or cracking, inhalation of vapors may affect the respiratory system
Skin Sensitization: Possible with repeated or prolonged contact
Mutagenicity/Carcinogenicity: No data available
Other Health Effects: Methanol released by hydrolysis is toxic through ingestion, skin, or inhalation
Ecotoxicity: Based on structural analogy, likely to be harmful to aquatic life at high concentrations, limited biodegradability in natural environments
Bioaccumulation: Potential for bioaccumulation is considered low but cannot be excluded
Mobility in Soil: May adsorb to soil components due to hydrophobic character
Persistence and Degradability: Slow degradation; forms stable silanols and methanol
Other Adverse Effects: Spilled materials may persist in sediments for extended periods
Waste Treatment Methods: Incinerate under controlled conditions, follow all local, regional, and federal regulations for disposal
Container Disposal: Do not reuse containers, triple rinse, puncture to prevent reuse, send to authorized waste facility
Environmental Precautions for Disposal: Avoid release to land, waterways, and sewers
Other Disposal Recommendations: Consult with registered waste disposal expert for large quantities or contaminated material
UN Number: 1993
Transport Name: Flammable liquid, n.o.s. (contains N-Hexadecylmethyldimethoxysilane)
Transport Hazard Class: 3 (Flammable Liquid)
Packing Group: III
Marine Pollutant: Not classified as a marine pollutant
Special Precautions: Protect containers during transport, keep away from ignition sources, labeled and documented under hazardous material regulations
OSHA Status: Regulated as hazardous by OSHA
TSCA Inventory: Listed or exempted
REACH Status: Components comply or are exempt
SARA Title III: Not listed as extremely hazardous, but methanol byproduct is regulated
California Proposition 65: Methanol produced during decomposition is listed as a reproductive toxin
WHMIS (Canada): Classified under flammable liquids
Labeling Requirements: Signal word “Warning”; applicable hazard and precautionary statements
Other Local Regulations: Check requirements in region of use or storage for compliance and reporting
