Product Name: 3-Acetoxypropyl Methyl Dichlorosilane
Synonyms: Acetoxypropylmethyldichlorosilane
Chemical Formula: C6H12Cl2O2Si
CAS Number: 17865-08-4
Manufacturer: Provided upon request
Recommended Use: Synthesis of silicon-based intermediates, production of specialty polymers, surface treatment agents
Emergency Contact: Refer to local safety contacts or Chemtrec hotline
Supplier Contact: Business phone and address included in regulatory paperwork
GHS Classification: Acute Toxicity (Oral, Inhalation), Skin Corrosive (Category 1B), Eye Damage (Category 1)
Signal Word: Danger
Hazard Statements: Harmful if swallowed. Causes severe skin burns and eye damage. Toxic if inhaled. Reacts with water to release hydrochloric acid.
Pictograms: Corrosive, Exclamation mark
Precautionary Statements: Avoid breathing vapors. Use only outdoors or in well-ventilated area. Wash thoroughly after handling. Wear protective gloves, protective clothing, eye protection, and face protection.
Substance: 3-Acetoxypropyl Methyl Dichlorosilane
CAS Number: 17865-08-4
EC Number: 241-077-3
Concentration: 95% or higher
Impurities and Stabilizing Additives: Acetic acid (trace), methyltrichlorosilane (trace, less than 1%)
Inhalation: Remove to fresh air immediately. Seek medical attention. Provide artificial respiration or oxygen if required. Symptoms include difficulty breathing, cough, and irritation of respiratory tract.
Skin Contact: Flush skin with copious amounts of water for at least 15 minutes. Remove contaminated clothing. Continue rinsing even under clothing. Immediate medical assistance needed due to risk of severe burns.
Eye Contact: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Keep eyelids open during rinsing, obtain immediate medical attention.
Ingestion: Do not induce vomiting. Rinse mouth with water. Never give anything by mouth to an unconscious person. Seek professional medical attention without delay.
Most Important Symptoms: Severe irritation, pain, chemical burns, risk of permanent tissue damage or blindness if not promptly treated.
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, alcohol-resistant foam. Water spray (do not use water jet directly on spill).
Specific Hazards: Releases hydrogen chloride gas, silicon oxides, and possibly acetic acid vapors when burned. Thermal decomposition may generate hazardous gases.
Protective Equipment: Firefighters should wear self-contained breathing apparatus and complete body protection.
Firefighting Instructions: Contain runoff to prevent environmental contamination. Approach from upwind, isolate area if possible.
Personal Precautions: Close access to spill area to unauthorized personnel, ventilate area, avoid breathing vapors, wear proper personal protection including chemical-resistant suits and goggles.
Environmental Precautions: Prevent product from entering drains, water courses, or soil. Notify authorities if a large spill contaminates government-regulated water.
Methods for Clean-up: Absorb with inert material, place in chemical waste container. Neutralize residues with sodium bicarbonate solution or dilute water spray followed by neutralization. Decontaminate clean-up tools and contaminated surfaces.
Handling: Work only in properly ventilated areas. Avoid all contact with skin, eyes, and clothing. Keep away from water, alcohols, bases, oxidizing agents. Always use tools and containers that are compatible with strong corrosives.
Storage: Store in tightly sealed original container in a cool, dry, well-ventilated chemical storage area. Keep away from direct sunlight, sources of moisture, heat, and sparks. Store away from incompatible materials such as acids, alkalies, or water.
Engineering Controls: Use chemical fume hoods or local exhaust ventilation. Emergency showers and eyewash stations must be accessible in work area.
Occupational Exposure Limits: No national OEL established for this compound, but control exposure using OHSA standards for hydrochloric acid gas or acetic acid as guides.
Personal Protective Equipment: Impermeable gloves (nitrile, butyl rubber), tightly fitted chemical safety goggles, full-face shield, chemical-resistant clothing, and OSHA or NIOSH-approved respirators.
Hygiene Measures: Wash hands and face thoroughly after handling. Remove and wash contaminated clothing before reuse. Do not eat, drink, or smoke inside work area.
Appearance: Clear, colorless to pale yellow liquid
Odor: Sharp, slightly acetic odor
pH: Not applicable (reacts with water)
Melting Point/Freezing Point: Data not available
Boiling Point: Approximately 177°C
Flash Point: 75°C (closed cup, estimated)
Evaporation Rate: No data available
Flammability: Combustible liquid
Vapor Pressure: Approximately 5 mmHg (20°C, estimated)
Solubility: Reacts with water. Soluble in organic solvents (ether, toluene)
Density: About 1.18 g/cm³ (20°C)
Partition Coefficient (n-octanol/water): No data available
Viscosity: Not determined
Reactivity: Highly reactive with water, alcohols, and other protic substances to produce hydrochloric acid and acetic acid. Polymerizes in presence of strong bases or acids.
Chemical Stability: Stable in sealed containers kept dry and cool. Decomposes rapidly with moisture.
Hazardous Reactions: Water, organic acids, oxidizers, and bases trigger violent reactions.
Decomposition Products: Hydrogen chloride, acetic acid, silicon dioxide (at high temperature or in fire).
Conditions to Avoid: Exposure to moisture, high temperatures, open flames, and incompatible substances.
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion.
Acute Effects: Severe chemical burns to skin, eyes, respiratory tract. Ingestion will lead to pain, burns, and possible perforation of GI tract.
Chronic Effects: Prolonged or repeated exposure may cause dermatitis or chronic respiratory damage.
LD50 / LC50: No specific animal data; structurally similar organosilanes have oral LD50 (rat) of 200-500 mg/kg.
Irritation/Corrosivity: Causes major tissue damage on contact.
Carcinogenicity, Mutagenicity, Reproductive Toxicity: No data for this substance; not listed by NTP, IARC, or OSHA as carcinogen.
Sensitization: May sensitize skin upon repeated exposure.
Toxicity: Toxic to aquatic organisms due to release of hydrochloric acid and acetic acid; disrupts pH and ecosystem balance.
Persistence and Degradability: Reacts rapidly with moisture producing silanols and organic acids. Degradation products persist, affecting local water chemistry.
Bioaccumulation: Not expected to bioaccumulate due to rapid hydrolysis.
Mobility in Soil: Mobile before hydrolysis, binds to soil particles after transformation.
Other Adverse Effects: Can trigger local corrosion of infrastructure and aquatic habitats if not fully contained.
Disposal Methods: Dispose in accordance with local, regional, and national regulations. Neutralize liquid residue before disposal using dilute carbonate solution or weak alkali.
Contaminated Packaging: Triple rinse containers before disposal, or puncture and send to authorized landfills if allowed by regulations.
Special Precautions: Do not dispose of down drain or natural environment. Avoid unregulated incineration or landfill if possible.
Waste Codes: Contact local environmental authorities.
UN Number: UN 3265
Proper Shipping Name: Corrosive Liquid, Acidic, Organic, N.O.S. (contains 3-Acetoxypropyl methyl dichlorosilane)
Transport Hazard Class: 8 (Corrosive)
Packing Group: II
Label: Corrosive
Special Precautions: Keep containers upright, secured in transport vehicles. Use secondary containment and protect from physical damage, water, and heat.
TSCA Status: Listed in US EPA Toxic Substances Control Act list.
DSL/NDSL (Canada): Listed or meets requirements.
EU Registration: REACH registration or exemption to be confirmed by manufacturer.
SARA Title III (Section 302/304/311/312/313): Contains hazardous components subject to reporting.
California Proposition 65: Not known to contain components listed by State of California.
Other Regulations: Subject to reporting, handling, and disposal requirements under workplace safety and hazardous material laws in many jurisdictions.
