Tetraethoxysilane
Ethyl silicate
Tetraethyl orthosilicate
(C2H5O)4Si
Molecular mass: 208.3
ICSC # 0333
CAS # 78-10-4
RTECS # VV9450000
UN # 1292
EC # 014-005-00-0
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Flammable.
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NO open flames, NO sparks, and NO smoking.
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Water spray,
foam,
alcohol-resistant foam.
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Explosion
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Above 37°C explosive vapour/air mixtures may be formed.
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Above 37°C use a closed system, ventilation, and explosion-proof electrical equipment.
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In case of fire: keep drums, etc., cool by spraying with water.
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Exposure
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•Inhalation
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Cough.
Dizziness.
Headache.
Sore throat.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
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•Skin
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Dry skin.
Redness.
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Protective gloves.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
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•Eyes
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Redness.
Pain.
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Safety spectacles
or
eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Confusion.
Vomiting.
(Further see Inhalation).
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Rinse mouth.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Personal protection: complete protective clothing including self-contained breathing apparatus.
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.
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Fireproof.
Separated from
acids,
oxidants
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Cool.
Dry.
Keep in a well-ventilated room.
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Xn symbol
R: 10-20-36/37
S: 2
UN Hazard Class: 3
UN Packing Group: III
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Important Data
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Physical State; Appearance:
COLOURLESS LIQUID
, WITH CHARACTERISTIC ODOUR.
Physical Dangers:
Chemical Dangers:
Reacts
with
acids
,
water
and
oxidants
.
Occupational Exposure Limits:
TLV: 10 ppm as TWA; (ACGIH 2004).
MAK: 10 ppm, 86 mg/m3
Peak limitation category: I(1); Pregnancy risk group: D;
(DFG 2006).
OSHA PEL: TWA 100 ppm (850 mg/m3)
NIOSH REL: TWA 10 ppm (85 mg/m3)
NIOSH IDLH: 700 ppm See: 78104
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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
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
.
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Physical
Properties
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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
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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
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Environmental
Data
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N O T E S
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Card has been partly updated in October 2005. See sections Occupational Exposure Limits, Emergency Response.
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H2; F2; R2;
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ADDITIONAL INFORMATION
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ICSC: 0333
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TETRAETHYL SILICATE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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