Product Name: Ethyl Silicate-40
Chemical Formula: Si(OCH2CH3)4
Description: Transparent liquid, colorless, with distinct odor
Recommended Use: Intermediate for silicic acid, binder in paints and coatings, cross-linking agent
Synonyms: Tetraethyl orthosilicate, TEOS, Ethyl polysilicate
Manufacturer/Supplier: Contact information provided on packaging
Emergency Contact Number: National Poison Center or local emergency services
GHS Classification: Flammable liquid (Category 3), Eye irritation (Category 2A), Specific target organ toxicity (Category 3, respiratory tract)
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: Keep away from heat, sparks, open flames. Use explosion-proof equipment. Wear protective gloves and eye protection. Avoid breathing vapor or mist.
Exposure Symptoms: Eye and skin irritation, coughing, headache, dizziness, difficulty breathing
Fire Hazard: Releases vapors which can accumulate, ignite easily
Chemical Name: Ethyl silicate, oligomeric (mixture)
CAS Number: 11099-06-2
Concentration: ≥ 98% (Ethyl silicate-40 represents a polymerized grade, 40% silica by mass, balance as ethyl silicate monomer or oligomer)
Impurities: Trace amounts of ethanol or higher ethyl silicates
Stabilizers: Typically none added
Inhalation: Move to fresh air right away. Keep calm and comfortable. Seek medical attention if symptoms appear.
Skin Contact: Remove any contaminated clothing. Rinse skin with plenty of water and soap for at least 15 minutes. Get medical help if irritation keeps going.
Eye Contact: Rinse open eyes with water for several minutes, lifting the upper and lower lids occasionally. Remove contacts. Get immediate medical attention.
Ingestion: Do not induce vomiting. Rinse mouth with water. Seek medical attention fast. Never give anything by mouth to an unconscious person.
Suitable Extinguishing Media: Use foam, dry chemical powder, or carbon dioxide. Water spray only in fog to avoid spreading flames.
Hazards from Combustion: Forms carbon oxides and silicon oxides. Vapors heavier than air, may travel to distant ignition sources.
Special Protective Equipment: Firefighters need self-contained breathing apparatus and full protective gear.
Fire-Fighting Procedures: Move containers from fire area if safe. Keep cool with water spray. Prevent firefighting run-off from entering drains.
Personal Precautions: Evacuate area if needed. Ventilate. Use proper PPE: gloves, goggles, and respirator.
Environmental Precautions: Prevent spill from entering drains, sewers, and waterways.
Methods for Cleanup: Absorb with earth, sand, or non-combustible materials; shovel into containers for disposal. Use spark-proof tools. Decontaminate area with detergent and water.
Disposal: Dispose according to local authority requirements.
Safe Handling: Work in well-ventilated area. Avoid breathing vapors or contact with skin and eyes. Ground containers during transfer. No smoking. Wash hands after use.
Storage Conditions: Store in cool, dry, well-ventilated place. Keep container tightly closed. Store away from oxidizers, acids, and moisture. Protect from direct sunlight.
Special Requirements: Use containers approved for flammable liquids. Label containers accurately.
OSHA/ACGIH Threshold Limits: 0.5 ppm as silicon compounds (recommendation, consult local rules)
Engineering Controls: Local exhaust ventilation or fume hood recommended.
Personal Protective Equipment (PPE): Chemical-resistant gloves (nitrile, butyl rubber), goggles or faceshield, long-sleeved clothing. Respirator with organic vapor cartridge if ventilation falls short.
Hygiene Measures: Wash hands before eating, drinking, or smoking. Remove contaminated garments and clean them.
Appearance: Clear to pale yellow liquid
Odor: Slightly fruity, distinctive
Odor Threshold: Not determined
pH: Not applicable
Melting Point/Freezing Point: -77 °C
Boiling Point: 168 - 176 °C
Flash Point: 47 - 52 °C (closed cup)
Evaporation Rate: Slower than ether
Flammability: Flammable
Explosion Limits: Lower: 1.3%, Upper: Not determined
Vapor Pressure: 2.7 hPa at 20°C
Vapor Density: About 8 (air=1)
Relative Density: 1.03 - 1.05 g/cm³
Solubility: Reacts slowly with water; miscible with many organic solvents
Partition Coefficient (n-octanol/water): Not available
Auto-Ignition Temperature: Approx. 220 °C
Decomposition Temperature: Not determined
Viscosity: 5 - 15 mPa.s at 20 °C
Chemical Stability: Stable under recommended storage and handling. Reacts slowly with water to form silica and ethanol.
Conditions to Avoid: Moisture, heat, flames, sparks, strong acids, and oxidizers
Incompatible Materials: Water, acids, strong bases, oxidizing agents
Hazardous Decomposition: Forms silicon oxides, carbon oxides, ethanol, and traces of other organic compounds.
Hazardous Reactions: Hydrolyzes slowly; may form gels that block lines or valves. Combines with moisture, releasing ethanol gas.
Acute Toxicity: Moderately toxic by inhalation, ingestion, and skin absorption. Oral LD50 (rat): ~2500 mg/kg; Dermal LD50 (rabbit): >2000 mg/kg.
Skin Corrosion/Irritation: Causes irritation, dryness, or cracking on prolonged contact.
Eye Damage/Irritation: Causes serious eye irritation and redness.
Respiratory or Skin Sensitization: May cause respiratory irritation on inhaling vapors.
Germ Cell Mutagenicity: Data limited, not enough evidence of mutagenic effect.
Carcinogenicity: No component classified as carcinogenic by IARC, ACGIH, NTP, or OSHA.
Reproductive Toxicity: Not enough evidence for reproductive harm.
Target Organ Toxicity: May affect nervous system on large exposures due to ethanol release.
Aquatic Toxicity: Harmful to aquatic life. Estimated LC50 (fish): 245 mg/L/96 h.
Persistence and Degradability: Hydrolyzes to silica and ethanol, both degrade in environment.
Bioaccumulation Potential: Low for primary chemical; breakdown product (ethanol) does not accumulate.
Mobility in Soil: Moderately mobile, but reacts with water forming solids.
Other Adverse Effects: Large spills may choke aquatic habitats by forming insoluble precipitates.
Waste Treatment Methods: Incinerate under controlled conditions or follow municipal regulations for hazardous waste.
Disposal of Containers: Empty containers may hold vapors. Rinse thoroughly and dispose of after puncturing or crushing.
Precautions: Do not dump into drains, surface water, or soil.
Regulatory Information: Disposal subject to local and national regulations. Consult agency guidelines.
UN Number: 1292
Proper Shipping Name: Tetraethyl silicate
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: III
Labels Required: Flammable liquid
Marine Pollutant: Not classified as such by most agencies
Special Precautions: Ship upright, away from sources of ignition, moisture, heat, and incompatible chemicals.
TSCA Inventory: Listed
EINECS: 203-852-7
REACH Registration: Registered or exempt
OSHA Hazard Communication: Flammable, hazardous chemical
SARA Title III: Not listed as extremely hazardous; subject to reporting for flammables
California Proposition 65: Not on the list
Other Information: Workers handling this product should have safety and health training, consistent periodic medical checks, and follow all regulatory guidelines regarding flammable chemical management.
