Chemical Name: Vinylmethyldimethoxysilane
Synonyms: Dimethoxy(vinyl)methylsilane
CAS Number: 16881-77-9
Recommended Use: Coupling agent, surface modifier, crosslinking agent in plastics and rubber production
Supplier Details: Manufacturer contact, address, and emergency telephone information provided by supplier
Emergency Telephone: Chemtrec and manufacturer’s 24/7 emergency helpline
Hazard Classification: Flammable liquid (Category 3), Acute Toxicity (Category 4, Oral/Dermal/Inhalation), Eye Irritation (Category 2A), Specific Target Organ Toxicity—Single Exposure (STOT SE, Category 3, Narcotic effects)
Label Elements: Flame, Exclamation mark symbols
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor. Harmful if swallowed, in contact with skin, or if inhaled. Causes serious eye irritation. May cause respiratory irritation and drowsiness or dizziness.
Precautionary Statements: Keep away from sources of ignition/no smoking. Avoid breathing vapors/spray. Wash thoroughly after handling. Use only outdoors or in a well-ventilated area. Wear eye/face protection, gloves, and suitable protective clothing.
Other Hazards: Vapor may form explosive mixtures with air. Hydrolysis may produce methanol.
Substance: Vinylmethyldimethoxysilane
Chemical Formula: C5H12O2Si
CAS Number: 16881-77-9
Concentration: 98% or greater
Impurities: Trace levels of water, methanol, and other organosilicon compounds may be present
Inhalation: Move person to fresh air immediately. If breathing is difficult, provide oxygen. If not breathing, perform artificial respiration. Seek medical advice.
Skin Contact: Remove contaminated clothing. Wash contact area with soap and plenty of water. Get medical attention if irritation develops.
Eye Contact: Rinse affected eyes cautiously with water for at least 15 minutes. Remove contact lenses if present and easy to do. Get medical attention.
Ingestion: Rinse mouth with water. Do not induce vomiting unless directed. Obtain medical advice. If vomiting occurs, keep head low to prevent aspiration.
Most Important Symptoms: Headache, nausea, drowsiness, skin and eye irritation
Indication of Immediate Medical Attention: Symptoms of respiratory distress or unconsciousness require immediate emergency care.
Suitable Extinguishing Media: Dry chemical, carbon dioxide, foam, or water spray (fog).
Unsuitable Media: Water jet can spread burning liquid.
Hazardous Combustion Products: Carbon oxides, silicon oxides, formaldehyde, and possibly methanol
Special Protective Equipment: Firefighters require full protective gear and self-contained breathing apparatus.
Special Precautions: Cool exposed containers with water spray to prevent rupture from heat. Evacuate area if vapor explosion risk exists.
Personal Precautions: Evacuate unprotected personnel. Ensure adequate ventilation. Wear chemical-resistant gloves, goggles, and suitable respiratory protection.
Environmental Precautions: Prevent spills from entering drains, sewers, and waterways. Notify local authorities if significant environmental discharge occurs.
Methods for Clean-Up: Remove all ignition sources. Stop leak if it is safe. Absorb spill with inert material (sand, earth, vermiculite). Place in a suitable, sealed container for disposal. Wash spill area with water and detergent.
Additional Advice: Use non-sparking tools.
Safe Handling: Handle in a fume hood or well-ventilated area. Wear proper personal protection. Keep away from sparks and open flames. Prevent static buildup with proper grounding.
Hygiene Practices: Wash hands after handling, before eating or drinking. Remove contaminated clothing and wash before reuse.
Storage Conditions: Store in a tightly closed container in a cool, well-ventilated area away from incompatible materials such as strong acids or oxidizers. Keep container upright and away from moisture.
Incompatible Materials: Acids, strong oxidizers, bases, water, strong reducing agents.
Storage Temperature: Suggested temperature ranges given by the manufacturer, typically below 25°C.
Exposure Limits: No OSHA PEL or ACGIH TLV for this compound. Observe limits for methanol (produced during hydrolysis): ACGIH TLV 200 ppm (TWA).
Engineering Controls: Use of local exhaust ventilation or airborne capture. Enclose processes to control exposure.
Personal Protective Equipment:
Respiratory—NIOSH/MESA approved respirator if exposure cannot be controlled.
Skin—Chemical-resistant gloves (nitrile or neoprene) and protective clothing.
Eyes—Chemical splash goggles and face shield.
Environmental Exposure Controls: Emissions should be controlled to meet workplace and regional requirements. Use spill containment if necessary.
Appearance: Colorless, clear liquid
Odor: Characteristic, ether-like
Odor Threshold: Not established
pH: Not applicable
Melting Point: -81°C
Boiling Point: 101°C
Flash Point: 21°C (closed cup)
Evaporation Rate: Not established
Flammability: Flammable liquid
Vapor Pressure: ~40 mmHg (20°C)
Vapor Density: 3.9 (air = 1)
Relative Density: 0.94 g/cm³ (20°C)
Solubility: Reacts slowly with water; soluble in most organic solvents
Partition Coefficient (n-octanol/water): 1.1 estimated
Auto-ignition Temperature: 255°C
Decomposition Temperature: Not specified
Viscosity: 0.65 mPa·s (20°C)
Chemical Stability: Stable under recommended storage conditions. Reacts with moisture.
Reactivity: Undergoes hydrolysis with water, releasing methanol.
Hazardous Reactions: Contact with strong acids or bases accelerates hydrolysis. Polymerization under certain conditions.
Conditions to Avoid: Heat, sources of ignition, contact with water and moisture during storage.
Incompatible Materials: Strong acids, bases, oxidizers, some metals.
Hazardous Decomposition Products: Methanol, formaldehyde, silicon oxides, carbon oxides.
Acute Toxicity: Harmful if swallowed, in contact with skin, or if inhaled. Oral LD50 (rat): 2100 mg/kg; Dermal LD50 (rabbit): 3400 mg/kg. Inhalation LC50 (rat, 4h): 12 mg/L.
Skin Corrosion/Irritation: May cause irritation and redness.
Eye Damage/Irritation: Causes serious eye irritation.
Respiratory Effects: May cause respiratory irritation, drowsiness, dizziness.
Chronic Effects: Prolonged or repeated exposure may cause dermatitis or liver effects due to methanol formation.
Sensitization: No current evidence of skin sensitization.
Carcinogenicity, Mutagenicity, Reproductive Toxicity: No classification based on available data, methanol is suspected of reproductive toxicity.
Target Organs: Eyes, skin, respiratory tract, central nervous system, liver, kidneys.
Ecotoxicity: Harmful to aquatic life with long-lasting effects. LC50 (96h, fish): >100 mg/L. EC50 (48h, daphnia): ~80 mg/L.
Persistence and Degradability: Product hydrolyzes and degrades in the environment. Methanol generated is readily biodegradable.
Bioaccumulative Potential: Low potential for bioaccumulation.
Mobility in Soil: Expected to have moderate to high mobility before hydrolysis.
Other Adverse Effects: Avoid uncontrolled release to the environment. Methanol breakdown products can be toxic to aquatic organisms.
Waste Treatment Methods: Dispose of contents/container in accordance with local, regional, and national regulations.
Incineration: Allowed at authorized facilities.
Disposal of Contaminated Packaging: Empty containers may contain hazardous residues. Triple rinse then offer for recycling or proper disposal.
Precautions: Do not discharge into surface water or drains. Seek advice from licensed waste disposal contractor.
Regulatory Requirements: Waste code determined by local regulations. Listed as hazardous under RCRA in the US if applicable.
UN Number: UN1993
UN Proper Shipping Name: Flammable liquids, n.o.s. (includes Vinylmethyldimethoxysilane)
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: II
Labels: Flammable liquid
Marine Pollutant: Not classified as a marine pollutant
Special Precautions: Keep away from heat and open flame during transport. Secure containers to prevent tipping or breakage.
IMDG, IATA, ADR: Classified as dangerous goods for international transport by all standard modes.
Safety, Health, Environmental Standards: Complies with OSHA hazard communication, EU REACH, and CLP regulations.
SARA Title III (Sections 311/312): Fire hazard, acute health hazard
SARA Title III (Section 313): Methanol (hydrolysis product) subject to reporting
TSCA Inventory Status: Listed
EINECS/ELINCS: 240-914-7
California Proposition 65: Methanol recognized as a hazard
Other International Requirements: Subject to additional labeling or exposure regulations in some countries
Workplace Classification: Classified as hazardous under GHS criteria
