Trimethylchlorosilane

  • Chlorotrimethylsilane
  • Trimethyl silyl chloride
  • Chlorotrimethylsilicane
Formula
(CH3)3SiCl
Structure
Description
A colorless fuming liquid with a pungent odor.
Uses
Intermediate for silicone fluids, as a chain terminating agent, imparting water repellency.

Registry Numbers and Inventories.
CAS
75-77-4
EC (EINECS/ELINCS)
200-900-5
EC Class
highly flammable, corrosive
R 11 14 21 34
S 16 26 36/37/39 45
RTECS
VV2710000
RTECS class
Tumorigen; Mutagen; Primary Irritant
UN (DOT)
1298
Beilstein/Gmelin
1209232
Beilstein Reference
4-04-00-04007
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H9ClSi
Formula mass
108.64
Melting point, °C
-58
Boiling point, °C
59
Vapor pressure, mmHg
220 (25 C)
Vapor density (air=1)
3.7
Density
0.8576 g/cm3
Solubility in water
Slightly soluble
Viscosity
0.34 cp (50 C)
Surface tension
17 g/s2 (20 C)
Refractive index
1.3870 (20 C)
Partition coefficient, pKow
2.18
Heat of vaporization
28.9 kJ/mol
Heat of combustion
-2362 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Flammables-area.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Do not ingest or inhale. Do not allow contact with water. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. Use a spark-proof tool.
Disposal code
24
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Acids, methanoic acid, oxalic acid), alcohols and glycols (e.g. butyl alcohol, ethanol, methanol, ethylene glycol), aldehydes (e.g. acetaldehyde, acrolein, chloral hydrate, formaldehyde), amides (e.g. butyramide, diethyltoluamide, dimethyl formamide), amines (aliphatic and aromatic, e.g. dimethyl amine, propylamine, pyridine, triethylamine), azo, diazo, and hydrazines (e.g. dimethyl hydrazine, hydrazine, methyl hydrazine), dithiocarbamates (e.g. ferbam, maneb, metham, thiram), esters (e.g. butyl acetate, ethyl acetate, propyl formate), halogenated organics (e.g. dibromoethane, hexachlorobenzene, methyl chloride, trichloroethylene), isocyanates (e.g. methyl isocyanate), ketones (e.g. acetone, ac
Decomposition
Hydrogen chloride, phosgene, carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
-18
Autoignition, °C
417
Upper exp. limit, %
6.0
Lower exp. limit, %
1.8
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Extremely flammable liquid. Water Reactive. Extinguishing media: Use carbon dioxide or dry chemical. DO NOT USE WATER! Contact professional fire-fighters immediately.
Fire potential
Dangerous fire hazard when exposed to heat or flame. Contact with water applied to adjacent fires produces irritating hydrogen chloride. Flammable liquid. Trichlorosilane is highly flammable. Trichlorosilane
Hazards
Violent reaction with water. Toxic and irritating hydrogen chloride and phosgene may be formed in fires. Difficult to extinguish, re-ignition may occur. Flashback along vapor trail may occur. Containers may explode in fire. Vapor may explode if ignited in enclosed area. When heated to decomposition or on contact with acids or acid fumes, chloride fumes are emitted. Reacts with surface moisture, releasing hydrogen chloride, which will corrode common metals and form flammable hydrogen gas. Avoid contact with water; it readily hydrolyzes, liberating hydrochloric acid.
Combustion products
Toxic and irritating hydrogen chloride and phosgene may be formed in fires.
Health
3
 
Flammability
3
 
 
Reactivity
2
 

Health.
Exposure effects
Prolonged or repeated skin contact may cause dermatitis.
   Ingestion
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns.
   Inhalation
May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema. Vapors may cause dizziness or suffocation.
   Skin
Contact with skin causes irritation and possible burns, especially if the skin is wet or moist. May be harmful if absorbed through the skin.
   Eyes
Causes severe eye burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Get medical aid immediately. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1298
Response guide
Hazard class
3
PRTC
T
Packing Group
II
 
USCG CHRIS Code
TMC
 
HS Code
2931 00 95
 
Std. Transport #
4907680