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NIOSH

METHYL SILICATE

ICSC: 1188

Tetramethyl silicate
Tetramethyl orthosilicate
Tetramethoxy silane
C4H12O4Si / (CH3O)4Si
Molecular mass: 152.3
ICSC # 1188 		CAS # 681-84-5
RTECS # VV9800000
UN # 2606
October 10, 1997 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Flammable.
NO open flames, NO sparks, and NO smoking.
Powder, water spray, foam, carbon dioxide.
EXPLOSION Above 20°C explosive vapour/air mixtures may be formed.
Above 20°C use a closed system, ventilation, and explosion-proof electrical equipment.

EXPOSURE
PREVENT GENERATION OF MISTS! STRICT HYGIENE!

•INHALATION Burning sensation. Cough. Shortness of breath. Sore throat. Symptoms may be delayed (see Notes).
Local exhaust or breathing protection.
Fresh air, rest. Half-upright position. Refer for medical attention.
•SKIN Redness. Pain.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse and then wash skin with water and soap.
•EYES Redness. Pain. Loss of vision.
Safety goggles, 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 Abdominal pain.
Do not eat, drink, or smoke during work.
Rinse mouth. Do NOT induce vomiting. Rest. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Collect leaking and spilled liquid in sealable containers as far as possible. Carefully collect remainder, then remove to safe place. (Extra personal protection: chemical protection suit including self-contained breathing apparatus).
Fireproof. Separated from food and feedstuffs.
Do not transport with food and feedstuffs.
UN Hazard Class: 6.1
UN Subsidiary Risks: 3
UN Packing Group: I
ICSC: 1188 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

METHYL SILICATE

ICSC: 1188

I

M

P

O

R

T

A

N

T


D

A

T

A

PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID.

PHYSICAL DANGERS:


CHEMICAL DANGERS:


OCCUPATIONAL EXPOSURE LIMITS:
TLV: 1 ppm; 6 mg/m3 (ACGIH 1997).
OSHA PEL†: none
NIOSH REL: TWA 1 ppm (6 mg/m3)
NIOSH IDLH: N.D. See: IDLH INDEX


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 can be reached very quickly on evaporation of this substance at 20°C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates severely the eyes, the skin and the respiratory tract. Inhalation of vapour may cause lung oedema (see Notes). The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the kidneys and liver.

PHYSICAL
PROPERTIES

Boiling point: 121°C
Melting point: -2°C
Relative density (water = 1): 1.02
Solubility in water: none
Vapour pressure, kPa at 20°C: 2.2
Relative vapour density (air = 1): 5.3
Flash point: 20°C c.c.

ENVIRONMENTAL
DATA


N O T E S

Other melting points: -8°C. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential.
Transport Emergency Card: TEC (R)-61G60

NFPA Code: H3; F3; R1;

ADDITIONAL INFORMATION



ICSC: 1188 METHYL SILICATE
(C) IPCS, CEC, 1994
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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