Product Name: Ethyl Polysilicates-32
Chemical Family: Silicon ester
Synonyms: Tetraethyl orthosilicate, Polyethoxy siloxane
CAS Number: 11099-06-2
Recommended Use: Used as a crosslinking agent, binder for coatings, and in the production of silica gels
Supplier: Industrial chemical distributors with specialization in raw materials
Contact Information: Address and phone number of supplier, available 24 hours for emergencies
Classification: Flammable liquid (Category 3), Acute toxicity (Category 4), Eye irritation (Category 2A)
Label Elements: Signal word: Warning, Hazard symbols: Flame and exclamation mark
Hazard Statements: Flammable liquid and vapor. Harmful if inhaled, swallowed, or absorbed through skin. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: Keep away from heat, sparks, and open flames. Use non-sparking tools. Avoid breathing vapors. Wear protective gloves, goggles, and face protection.
Other Hazards: Prolonged exposure may cause central nervous system effects like drowsiness, dizziness, and nausea
Ingredient: Ethyl Polysilicates-32
Chemical Formula: (C2H5O)4Si (mixture of oligomers)
Content: >90% by weight
Impurities: Ethanol present as hydrolysis product (≤3% by weight)
Other Ingredients: Minor organosilicon compounds formed during manufacturing processes
Inhalation: Move person to fresh air immediately. If not breathing, start artificial respiration. Get medical attention for difficulty in breathing.
Skin Contact: Remove contaminated clothing and shoes. Wash skin thoroughly with soap and water. Seek medical help if irritation or redness develops.
Eye Contact: Rinse cautiously with water for at least 15 minutes holding eyelids open. Seek medical attention because eye exposure carries risk of damage.
Ingestion: Rinse mouth, do not induce vomiting. Give water to conscious person. Immediate medical attention required due to ethanol release risk.
Note to Physician: Treat symptomatically, monitor for effects of hydrolyzed ethanol and risk of aspiration into lungs
Suitable Extinguishing Media: Use dry chemical, alcohol-resistant foam, carbon dioxide, or water spray (fog)
Unsuitable Media: Direct water jet increases risk of spread
Hazards from Combustion: Emits silicon oxides, carbon oxides, and ethanol vapors when burning
Firefighter Protection: Wear positive pressure self-contained breathing apparatus (SCBA) and full protective clothing
Specific Hazards: Containers exposed to heat or fire may burst due to buildup of ethanol vapor. Dangerous vapors may flow along surfaces to distant ignition sources.
Personal Protection: Eliminate ignition sources. Ventilate area. Wear protective gloves, chemical splash goggles, and apron.
Environmental Precautions: Prevent liquid from entering drains, sewers, or waterways. Use sand or vermiculite to absorb spilled liquid.
Cleanup Methods: Cover spill with inert, absorbent material. Collect residue with non-sparking equipment into containers for safe disposal.
Special Note: Washed surfaces may become slippery. Remove contaminated clothing and clean before reuse.
Handling: Avoid contact with eyes, skin, and clothing. Prevent inhalation of vapors. Use only in well-ventilated areas. Ground and bond containers during transfer to reduce fire risk. Keep away from sources of ignition, static discharge, and oxidizing agents.
Storage: Store in a tightly closed original container. Keep in a cool, dry, well-ventilated area away from heat and sunlight. Segregate from incompatible materials such as acids, alkalis, and oxidizers.
Storage Conditions: Protect from moisture as hydrolysis can form ethanol. Store at temperature between 5°C and 30°C. Use explosion-proof electrical fixtures.
Exposure Limits: Ethanol (OSHA PEL: 1000 ppm TWA)
Engineering Controls: Use only with adequate ventilation. Provide local exhaust at points of emission.
Personal Protective Equipment: Respiratory protection (organic vapor cartridge or SCBA for high levels), chemical-resistant gloves (butyl rubber or nitrile), safety goggles, face shield, and flame-resistant clothing. Emergency showers and eye wash stations should be close to the work area.
Hygiene Measures: Do not eat, drink or smoke in areas with chemical use. Wash hands and face thoroughly after handling.
Appearance: Clear, colorless to pale yellow liquid
Odor: Slightly alcoholic, characteristic
Odor Threshold: Not established
pH: Not applicable (reacts with water)
Melting/Freezing Point: Not established; below -80°C for component silicates
Boiling Point: Range between 170°C and 250°C depending on oligomer content
Flash Point: 39°C to 45°C (closed cup)
Evaporation Rate: Slower than ether, variable
Flammability: Flammable liquid and vapor
Vapor Pressure: 4-15 mmHg at 20°C
Vapor Density: Greater than air
Solubility: Decomposes in water to form silica gel and ethanol
Partition Coefficient (n-octanol/water): Not available
Auto-ignition Temperature: About 265°C
Decomposition Temperature: Not determined specifically; hydrolysis occurs with moisture
Viscosity: 3 to 5 mPa.s at 25°C
Density: Approximately 1.004 g/mL at 20°C
Chemical Stability: Stable under normal storage and handling. Moisture-sensitive material. Hydrolyzes slowly in presence of water.
Reactivity: Reacts with acids, bases, and water with release of ethanol
Conditions to Avoid: Exposure to moisture, elevated temperatures, sources of ignition, and incompatible substances
Incompatible Materials: Water, strong oxidizers, acids, bases, amines
Hazardous Decomposition: Silicon oxides, carbon oxides, ethanol
Hazardous Polymerization: Will not occur
Acute Toxicity: Oral LD50 (rat): >2000 mg/kg; Dermal LD50 (rabbit): >2000 mg/kg
Inhalation: High vapor concentrations may cause dizziness, drowsiness, and irritation to respiratory system
Skin: May cause mild skin irritation and dryness
Eyes: Causes burning, pain, redness, and blurred vision
Chronic Effects: No evidence of long-term carcinogenicity, mutagenicity, or reproductive toxicity in available animal studies
Target Organs: Central nervous system (from ethanol), skin, eyes, respiratory tract
Other Studies: Long-term exposure data limited, focus remains on solvent ethanol risk and temporary irritation
Ecotoxicity: Harmful to aquatic life at high concentrations due to ethanol and organosilicate fractions
Aquatic Toxicity: LC50 (Fish, 96 hr): >100 mg/L (low hazard); EC50 (Daphnia, 48 hr): >50 mg/L
Persistence and Degradability: Hydrolyzes in water to non-volatile, non-mobile silica and ethanol that degrades rapidly
Bioaccumulation: Likelihood of bioaccumulation is low for hydrolysis products
Mobility in Soil: Binds to soil rapidly forming insoluble silica
Other Adverse Effects: Reduces dissolved oxygen if large spill occurs in aquatic systems
Waste Disposal Methods: Dispose by incineration in approved chemical disposal facility. Do not pour into sewers or septic systems. Follow local, state, and federal disposal regulations.
Container Disposal: Empty containers may hold flammable vapors and residues. Do not cut, weld, or reuse drums unless thoroughly cleaned. Triple rinse and puncture before recycling or disposal.
Special Precautions: Store waste in properly labeled containers. Keep away from ignition sources pending disposal.
UN Number: UN1292
Proper Shipping Name: Tetraethyl silicate or Ethyl Polysilicates-32
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: III
Labels Required: Flammable liquid
Transportation Details: Ship in tightly sealed containers. Protect from physical damage and heat. Comply with federal and international transport regulations (DOT, IATA, IMDG). Emergency Response Guide Number 129.
US TSCA Inventory: All components listed
OSHA: Classified as hazardous (flammable, toxic by ingestion)
SARA Title III Sections 302/313: Not listed as extremely hazardous
RCRA Status: Not RCRA hazardous waste as sold; ethanol byproduct may trigger local limits
California Proposition 65: Contains no chemicals known to the State of California to cause cancer or reproductive toxicity
European Regulation (REACH): Registered under REACH
Other National Inventory Status: Listed in Australia, Canada, Japan, China, Korea, Philippines chemical inventories
Worker Health and Safety Guidance: Comply with workplace exposure limits, label requirements, and safety training for flammable chemicals
