Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
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Tetramethoxysilane(681-84-5)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

Product Identification

Product Name
Tetramethoxysilane
Synonyms
Methyl silicate
Tetramethyl orthosilicate
CAS
681-84-5
Formula
C4H12O4Si
Molecular Weight
152.22
EINECS
211-656-4
RTECS
VV9800000
RTECS Class
Other
Beilstein/Gmelin
1699658
Beilstein Reference
4-01-00-01266
EC Class
flammable, very toxic, irritant

Physical and Chemical Properties

Appearance
Clear colorless liquid.
Solubility in water
Insoluble
Melting Point
-2
Boiling Point
121
Vapor Pressure
18 (25 C)
Density
1.02 g/cm3 (20 C)
Partition Coefficient
2.97
Heat Of Vaporization
37.1 kJ/mol
Heat Of Combustion
-2906 kJ/mol
Usage
In coating picture screens of television picture tubes.
Vapor Density
5.3
Saturation Concentration
16000 ppm (1.6%) at 25 C (calculated)
Refractive Index
1.3683 (20 C)

First Aid Measures

Ingestion
Do not induce vomiting. Give copious amounts of water and seek immediate medical attention.
Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Handling and Storage

Storage
Store in closed container in a dry location. Keep away from sources of ignition and heat.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Ingestion
See Inhalation.
Inhalation
Corrosive. Causes burns. Highly destructive to skin, eyes, mucous membranes and upper respiratory tract. Ingestion or inhalation could prove fatal. Spasms, inflammation and edema of the lungs.
Skin
See Inhalation.
Eyes
See Inhalation.
Hazards
Vapors form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.
EC Risk Phrase
R 10 23 34 37 41
EC Safety Phrase
S 26 28 36/37/39 45
UN (DOT)
2606

Exposure Controls/Personal Protection

Personal Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Exposure limit(s)
TLV: 1 ppm; 6 mg/m3 (ACGIH 1997). NIOSH REL: TWA 1 ppm (6 mg/m3)
Poison Class
2

Fire Fighting Measures

Flash Point
26
Autoignition
240
Fire Fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may be ineffective. Cool all affected containers with flooding quantities of water. Use foam, dry chemical, or carbon dioxide. Keep run-off water out of sewers and water sources.
Fire Potential
HIGHLY FLAMMABLE.

Accidental Release Measures

Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors. Disperse vapors using fans or blowers. Land spill: Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash, cement powder, or commercial sorbents. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Remove trapped material with suction hoses.

Stability and Reactivity

Stability
No data.
Incompatibilities
Oxidizers, hexafluorides of rhenium, molybdenum & tungsten.
Decomposition
Carbon monoxide, hydrogen cyanide and oxides of nitrogen.
Combustion Products
Fire will produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number
2606
Hazard Class
6.1
Packing Group
I
HS Code
2920 90 85
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