Product Name: Ethyl Silicate-32
Chemical Name: Tetraethyl orthosilicate
Synonyms: Tetraethoxysilane, Silicon tetraethoxide
CAS Number: 78-10-4
Recommended Use: Used in coatings, adhesives, and as a silica source in chemical synthesis
Manufacturer: Refer to product label for company name and address
Emergency Contact: National chemical emergency hotline and manufacturer’s emergency contact number appear on packaging
UN Number: 1292
Proper Shipping Name: Tetraethyl silicate
Recommended Restrictions: For industrial use only, keep out of reach of children
Physical Hazards: Highly flammable liquid and vapor, can form explosive mixtures with air
Health Hazards: Causes severe eye irritation, can lead to respiratory tract and skin irritation, central nervous system depressant in high concentrations
Label Elements: Flammable liquid (GHS02 Flame pictogram), irritant (GHS07 Exclamation Mark pictogram)
Signal Word: Danger
Hazard Statements: Causes serious eye irritation; may cause drowsiness or dizziness; highly flammable liquid and vapor
Precautionary Statements: Keep away from heat, sparks, open flames, and hot surfaces; avoid breathing vapors; wear protective equipment; wash hands thoroughly after handling
Chemical Name: Tetraethyl orthosilicate
Concentration: 98–100%
CAS Number: 78-10-4
Impurities: Ethanol — forms in presence of moisture, under storage or transport — concentration varies, listed as a secondary component
Other Components: No other significant hazardous substances present
Inhalation: Move victim to fresh air, keep warm and allow to rest, provide artificial respiration if breathing stops, seek medical attention for continued symptoms
Skin Contact: Remove contaminated clothing immediately, wash affected skin thoroughly with soap and water, get medical attention for redness or burns
Eye Contact: Rinse eyes cautiously with water for fifteen to twenty minutes, lift upper and lower eyelids occasionally, remove contact lenses if present and easy to do, continue rinsing and seek immediate medical attention
Ingestion: Do not induce vomiting, rinse mouth with water, never give anything by mouth to an unconscious person, seek medical advice immediately
Note for Physicians: Monitor for chemical pneumonitis, treat symptomatically and supportively, consider possibility of ethanol exposure due to hydrolysis
Suitable Extinguishing Media: Dry chemical, foam, carbon dioxide, alcohol-resistant foam
Unsuitable Extinguishing Media: Water jets may spread fire
Specific Hazards from Fire: Produces toxic gases under fire conditions, such as silicon oxides, carbon monoxide, and carbon dioxide
Protective Equipment for Firefighters: Self-contained breathing apparatus, full protective clothing, use caution around containers exposed to flames
Firefighting Instructions: Evacuate area, cool closed containers with water spray, prevent run-off from entering drains or waterways, keep upwind
Personal Precautions: Wear chemical splash goggles, chemical-resistant gloves, suitable protective clothing, keep unauthorized personnel away
Environmental Precautions: Prevent entry into drains, sewers, or waterways, contain spill
Methods for Clean Up: Stop leak if safe to do so, use absorbent non-combustible material (e.g. sand or earth), put absorbed material into suitable containers for disposal, ventilate area, wash spill site after material pickup
Additional Guidance: Notify environmental authorities if large quantities escape
Handling: Use with adequate ventilation or exhaust, avoid inhaling vapors or contact with skin and eyes, ground and bond containers and equipment, keep away from sources of ignition, do not smoke during use, avoid static discharge
Storage: Keep containers tightly closed in cool, dry, well-ventilated area, store away from heat, sparks, incompatible substances (like acids, bases, oxidizing agents, water/moisture), store in original containers if possible, control temperature to avoid hydrolysis or pressure build-up
Incompatible Materials: Water, moisture, acids, alkalis, and oxidizing agents
Occupational Exposure Limits: No established TLV for tetraethyl orthosilicate; ACGIH TLV for ethanol (byproduct) = 1000 ppm
Engineering Controls: Local exhaust ventilation, safety showers, eyewash stations
Respiratory Protection: Use NIOSH-approved respirator for organic vapors if exposure exceeds occupational limits or ventilation inadequate
Skin Protection: Chemical-resistant gloves, impervious clothing
Eye Protection: Safety goggles or face shield
Hygiene Measures: Wash hands and face thoroughly after handling, remove contaminated clothing and wash before reuse, avoid eating, drinking, or smoking during use
Appearance: Colorless, clear liquid
Odor: Sweet, alcohol-like
Odor Threshold: No data available
pH: Not applicable
Melting Point/Freezing Point: -77°C
Boiling Point/Range: 168–170°C
Flash Point: 46°C (closed cup)
Evaporation Rate: Slower than ether
Flammability: Highly flammable
Upper/Lower Flammability Limits: LEL: 1.5% (v/v), UEL: 23.5% (v/v)
Vapor Pressure: 1.3 hPa at 20°C
Vapor Density: 8.2 (air = 1)
Relative Density: 0.93 g/cm³ (20°C)
Solubility: Decomposes in water, soluble in common organic solvents
Partition Coefficient n-octanol/water: log Kow: 1.5–1.8
Auto-ignition Temperature: 215°C
Decomposition Temperature: Not available
Viscosity: 2.6 mPa·s (25°C)
Reactivity: Reacts with moisture forming ethanol and silicon dioxide, may build up pressure in closed tanks
Chemical Stability: Stable under dry, cool conditions; moisture contamination leads to hydrolysis
Hazardous Reactions: Polymerizes with water, risk of heat and gas release
Hazardous Decomposition Products: Ethanol, silicon oxides
Incompatibility: Strong acids, alkalis, oxidizing agents, water, and moisture
Conditions to Avoid: Moisture, heat, ignition sources, sunlight
Routes of Exposure: Inhalation, skin absorption, eye and oral contact
Acute Toxicity: Oral LD50 (rat) ~6270 mg/kg, Inhalation LC50 (rat, 4hr) >16.8 mg/L, low dermal toxicity
Irritation: Moderate to severe eye irritant, slight skin irritant
Sensitization: Not expected to cause skin sensitization
Chronic Effects: May cause adverse effects to central nervous system, repeated exposure can lead to headache, dizziness, narcosis
Target Organs: Respiratory tract, eyes, skin, central nervous system
Carcinogenicity: Not classified as carcinogenic by NTP, IARC, OSHA
Mutagenicity: No evidence in standard tests
Reproductive Toxicity: No data showing reproductive hazards
Ecotoxicity: Low acute toxicity to aquatic organisms; hydrolysis releases ethanol, which may cause environmental harm in larger quantities
Persistence and Degradability: Hydrolyzes rapidly in water forming silica and ethanol, silica precipitates, ethanol degrades readily
Bioaccumulation Potential: Ethyl silicate itself shows low potential, ethanol does not bioaccumulate
Mobility in Soil: Moves rapidly through soil before hydrolysis
Other Adverse Effects: Avoid release to environment, as hydrolysis byproducts and spills can reach groundwater
Disposal Methods: Dispose of in accordance with local, regional, national, and federal regulations; incineration under controlled conditions best suited
Waste Treatment: Chemical must not be poured down drain; contaminated containers and packaging treated as hazardous waste
Precautions: Wear protective equipment when handling waste; notify licensed chemical disposal contractor
Unused Product: Recycle or reclaim if possible; otherwise, incinerate with approved facilities
UN Number: 1292
UN Proper Shipping Name: Tetraethyl silicate
Transport Hazard Class(es): 3 (Flammable Liquids)
Packing Group: III
Environmental Hazards: Not a marine pollutant
Special Precautions for User: Avoid sources of ignition, keep containers upright and secure during transport; use DOT-approved packaging
Regulatory References: IMDG, IATA, ADR, DOT all regulate under flammable liquid classes; consult current versions for compliance
OSHA Classification: Hazardous, flammable, eye irritant
SARA Title III (Sections 311/312): Immediate (Acute) Health Hazard, Fire Hazard
TSCA Inventory: Listed
EINECS Number: 201-083-8
California Prop 65: Not listed as a carcinogen or reproductive toxicant
WHMIS: B2 (Flammable liquid), D2B (Toxic/eye or skin irritant)
Chemical Safety Assessment: Provided by supplier as per REACH requirements
