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TETRAETHYL SILICATE
ICSC: 0333
Peer-Review Status: 25.03.1998 Validated
Tetraethoxysilane
Ethyl silicate
Tetraethyl orthosilicate 
CAS #: 78-10-4 RTECS #: VV9450000
UN #: 1292
EC #: 014-005-00-0
EINECS #: 201-083-8
    Formula: (C2H5O)4Si
Molecular mass: 208.3

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Flammable.  NO open flames, NO sparks and NO smoking.  Use water spray, foam, alcohol-resistant foam. 
EXPLOSION Above 37°C explosive vapour/air mixtures may be formed.  Above 37°C use a closed system, ventilation and explosion-proof electrical equipment.  In case of fire: keep drums, etc., cool by spraying with water. 
 
EXPOSURE      
Inhalation Cough. Dizziness. Headache. Sore throat.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. 
Skin Dry skin. Redness.  Protective gloves.  Remove contaminated clothes. Rinse skin with plenty of water or shower. 
Eyes Redness. Pain.  Wear safety spectacles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Confusion. Vomiting. Further see Inhalation.    Rinse mouth. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. Remove all ignition sources. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Note: Reacts with water to form an adhesive mass.   
EC Classification
Symbol: Xn; R: 10-20-36/37; S: (2) 
UN Classification
UN Hazard Class: 3; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30GF1-III.
NFPA Code: H2; F2; R2. 
Fireproof. Separated from acids and oxidants. Cool. Dry. Keep in a well-ventilated room. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
 

Chemical dangers
Reacts with acids, water and oxidants. 

Occupational exposure limits
TLV: 10ppm as TWA; (ACGIH 2004).
MAK: 10 ppm, 86 mg/m³; Peak limitation category: I(1); Pregnancy risk group: D; (DFG 2006). 

Routes of exposure
The substance can be absorbed into the body by inhalation of its vapour and by ingestion. 

Inhalation risk
A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. Exposure could cause lowering of consciousness. 

Effects of long-term or repeated exposure
The liquid defats the skin. The substance may have effects on the kidneys. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 168°C
Melting point: -77°C
Relative density (water = 1): 0.93
Solubility in water: slowly hydrolyzes
Vapour pressure, Pa at 20°C: 200
Relative vapour density (air = 1): 7.22
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01
Flash point: 37°C c.c.
Explosive limits, vol% in air: 1.3-23 
 

NOTES
Card has been partly updated in October 2005.
See sections Occupational Exposure Limits, Emergency Response.
Card has been partially updated in July 2007: see Occupational Exposure Limits. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations