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TETRAETHYL SILICATE ICSC: 0333
Date of Peer Review: March 1998

Tetraethoxysilane
Ethyl silicate
Tetraethyl orthosilicate
CAS # 78-10-4 (C2H5O)4Si
RTECS # VV9450000 Molecular mass: 208.3
UN # 1292
EC Index # 014-005-00-0
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Flammable.
NO open flames, NO sparks, and NO smoking.
Water spray, foam, alcohol-resistant foam.
EXPLOSION Above 37C explosive vapour/air mixtures may be formed.
Above 37C 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.
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.
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 take to a doctor.
Ingestion Confusion. Vomiting. (Further see Inhalation).

Rinse mouth.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Ventilation. Remove all ignition sources. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Note: Reacts with water to form an adhesive mass. Personal protection: complete protective clothing including self-contained breathing apparatus.
EU Classification
Symbol: Xn
R: 10-20-36/37
S: (2-)
UN Classification
UN Hazard Class: 3
UN Pack Group: III
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H2; F2; R2;
Fireproof. Separated from acids, oxidants. Cool. Dry. Keep in a well-ventilated room.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
TETRAETHYL SILICATE ICSC: 0333
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

CHEMICAL DANGERS:
Reacts with acids, water and oxidants.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 10 ppm as TWA; (ACGIH 2004).
MAK: 10 ppm, 86 mg/m; Peak limitation category: I(1); Pregnancy risk group: IIc; (DFG 2004).
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 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes, the skin and the 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
Boiling point: 168C
Melting point: -77C
Relative density (water = 1): 0.93
Solubility in water: slowly hydrolyzes
Vapour pressure, Pa at 20C: 200
Relative vapour density (air = 1): 7.22
Relative density of the vapour/air-mixture at 20C (air = 1): 1.01
Flash point: 37C c.c.
Explosive limits, vol% in air: 1.3-23
ENVIRONMENTAL DATA

NOTES
Card has been partly updated in October 2005. See sections Occupational Exposure Limits, Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2005