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TETRAETHYL SILICATEICSC: 0333
March 1998
CAS #: 78-10-4Tetraethoxysilane
Ethyl silicate
Tetraethyl orthosilicate
UN #: 1292
EINECS #: 201-083-8

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable.  Above 37°C explosive vapour/air mixtures may be formed.  NO open flames, NO sparks and NO smoking.  Above 37°C use a closed system, ventilation and explosion-proof electrical equipment.  Use water spray, foam, alcohol-resistant foam.  In case of fire: keep drums, etc., cool by spraying with water. 

   
  SYMPTOMS ACUTE HAZARDS FIRST AID
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 CLASSIFICATION & 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. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 3; UN Pack Group: III 

STORAGE
Fireproof. Separated from acids and oxidants. Cool. Dry. Keep in a well-ventilated room. 
PACKAGING
 
TETRAETHYL SILICATE ICSC: 0333
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
 

Chemical dangers
Reacts with acids, water and oxidants. 

Formula: (C2H5O)4Si
Molecular mass: 208.3
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 


EXPOSURE & HEALTH EFFECTS

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

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

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

Effects of long-term or repeated exposure
The substance defats the skin, which may cause dryness or cracking. The substance may have effects on the kidneys. 


Occupational exposure limits
TLV: 1 ppm as TWA.
MAK: 86 mg/m3, 10 ppm; peak limitation category: I(1); pregnancy risk group: D.
EU-OEL: 44 mg/m3, 5 ppm as TWA 

ENVIRONMENT
 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
Symbol: Xn; R: 10-20-36/37; S: (2) 

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    See Also:
       Toxicological Abbreviations