Product Name: Poly-Methyltriethoxysilane
Chemical Formula: (C2H5O)3SiCH3
Synonyms: Methyltriethoxysilane-based polymers
Uses: Applied in surface coatings, sealants, water repellents, adhesives, and protective treatments for building materials
Manufacturer Contact: Refer to specific supplier—usually listed on packaging or relevant commercial documentation
Emergency Phone Number: Access through local poison control or manufacturer's emergency contact
Hazard Class: Flammable liquid, Irritant to eyes and respiratory tract
Pictograms: Flame, exclamation mark
Signal Word: Warning
Hazard Statements: Causes eye and skin irritation, may cause drowsiness or dizziness, can be harmful if inhaled or swallowed, highly flammable vapor possible
Precautionary Statements: Avoid breathing mist or vapor, keep away from open flames and sparks, use in a well-ventilated area, avoid contact with eyes and skin, keep container tightly sealed
Chemical Identity: Poly-Methyltriethoxysilane
CAS Number: 3049-71-6 (for monomeric form)
Concentration: Typically above 80% for technical grade
Other Components: Ethanol (less than 5%), water (less than 2%), trace siloxanes
Impurities: Unreacted monomers, possible solvent residues from production process
Eye Contact: Flush with plenty of running water for at least 15 minutes, seek medical attention if irritation persists
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with soap and water, medical aid recommended if redness or irritation continues
Inhalation: Move to fresh air immediately, keep person calm and rested, medical supervision recommended if symptoms like coughing or dizziness appear
Ingestion: Do not induce vomiting, rinse mouth with water, seek urgent medical attention
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, foam for larger fires, water spray to cool surrounding materials
Unsuitable Media: Water jets may spread burning liquid
Special Hazards: Vapors can spread along surfaces, flashback possible, combustion produces silicon oxides and toxic gases
Protective Equipment: Full protective clothing, self-contained breathing apparatus
Firefighting Instructions: Approach fire from upwind, stay clear of low-lying vapors
Personal Precautions: Wear chemical resistant gloves, protective goggles, and respirator if needed
Environmental Precautions: Prevent spillage into drains or waterways, avoid soil contamination
Cleanup Methods: Absorb with inert material such as sand or earth, transfer to labeled waste containers, wash area with detergent and water, ventilate space
Handling: Use only in areas with adequate ventilation, ground containers when transferring, keep away from sources of ignition, do not breathe vapor or mist, avoid contact with skin or clothing
Storage: Store in tightly closed containers, keep in a dry, cool, well-ventilated area, protect from humidity, ensure proper labeling, keep away from oxidizing agents and acids
Occupational Exposure Limits: No established limit for the polymer, but use ACGIH or OSHA guidelines for ethanol and similar solvents as a reference
Engineering Controls: Install local exhaust ventilation where vapor concentrations may be high, use explosion-proof equipment
Personal Protective Equipment: Chemical-resistant gloves (nitrile or neoprene), safety goggles, flame retardant lab coat, suitable respirator for high concentrations
Hygiene Measures: Wash hands before eating, drinking, or smoking, remove contaminated clothing before entering shared spaces
Appearance: Colorless to pale yellow transparent liquid
Odor: Mild, characteristic
Boiling Point: Estimated around 150–160°C (varies with chain length)
Flash Point: 42–48°C
Vapor Pressure: Low at room temperature
Solubility: Hydrolyzes slowly in water, soluble in alcohols and most organic solvents
Density: Around 0.95–1.01 g/cm³
Viscosity: Varies, generally low to moderate based on degree of polymerization
Chemical Stability: Stable under recommended storage conditions
Reactivity: May react with strong acids, alkalis, and oxidizing agents
Decomposition Products: Ethanol, silicon oxides, carbon oxides under high heat or fire
Conditions to Avoid: Moisture, heat, flames, incompatible materials like strong acids or oxidizers
Acute Toxicity: Low acute toxicity by oral and dermal routes, moderate respiratory and eye irritation
Skin Sensitization: Prolonged or repeated contact may cause dryness or cracking
Eye Effects: Redness, tearing, stinging sensation
Inhalation Effects: Cough, headache, dizziness in poorly ventilated spaces
Chronic Effects: No known evidence of carcinogenicity or mutagenicity based on polymer data
Medical Conditions Aggravated: Pre-existing skin, lung, or eye disorders
Ecotoxicity: Limited data, but organosilanes often hydrolyze slowly, breakdown products may be less harmful to aquatic life
Persistence and Degradability: Hydrolyzes in moisture-rich environments, forms ethanol and silicic acid
Bioaccumulation: Unlikely to bioaccumulate due to rapid environmental breakdown
Mobility: Liquid may penetrate soil, breakdown likely to limit impact
Aquatic Toxicity: Ethanol produced in hydrolysis can affect aquatic organisms if released in bulk quantities
Waste Disposal Methods: Dispose of product and contaminated packaging through licensed chemical waste disposal contractor
Container Handling: Triple rinse containers, puncture and offer for recycling or proper landfill disposal
Incineration: Suitable for incineration under controlled conditions, with proper pollution control equipment
Do Not: Pour down the drain or mix with household waste streams
UN Number: UN1993
Proper Shipping Name: Flammable Liquid, N.O.S. (contains Methyltriethoxysilane polymers)
Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Labels: Flammable liquid
Transport Conditions: Keep upright, secure loads to prevent tipping, avoid cargo with oxidizers or strong acids
OSHA: Classified as hazardous under the Hazard Communication Standard
TSCA: Listed (United States Toxic Substances Control Act Inventory)
REACH: Registered or pre-registered in Europe, additional restrictions may apply for consumer uses
DSL/NDSL: Canadian Domestic Substances List: Check for current status
Other Regulations: Subject to labeling, reporting, and transportation rules for flammable chemicals in most jurisdictions
