Methyltrichlorosilane

  • Trichloromethylsilane
  • Trichloro(methyl)silane
Formula
CH3SiCl3
Structure
Description
A colorless fuming liquid with a pungent odor.
Uses
Intermediate for silicones.

Registry Numbers and Inventories.
CAS
75-79-6
EC (EINECS/ELINCS)
200-902-6
EC Index Number
014-004-00-5
EC Class
Reacts violently with water; Highly flammable; Irritant
R 11 14 36/37/38
RTECS
VV4550000
RTECS class
Primary Irritant
UN (DOT)
1250
Beilstein/Gmelin
1361381
Beilstein Reference
4-04-00-04212
Swiss Giftliste 1
G-3648
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH3Cl3Si
Formula mass
149.48
Melting point, °C
-90
Boiling point, °C
66
Vapor pressure, mmHg
167
Vapor density (air=1)
5.17
Odor Threshold Odor threshold as hydrochloric acid - 1 ppm
Density
1.27 g/cm3 (20 C)
Solubility in water
Decomposes
Surface tension
20.3 g/s2
Refractive index
1.412 (20 C)
Partition coefficient, pKow
4.19
Heat of vaporization
30.2 kJ/mol
Heat of combustion
-1014 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket. Flammables-area.
Handling
Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. Do not allow contact with water. Use only in a chemical fume hood.
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
Unstable.
Incompatibilities
Strong acids - strong bases - strong oxidizing agents - alcohols - chemically active metals (potassium, magnesium, sodium, zinc) - alkalis.
Decomposition
Hydrogen chloride, phosgene, carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
-15
Autoignition, °C
> 500
Upper exp. limit, %
10.4
Lower exp. limit, %
5.5
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Containers may explode in the heat of a fire. Extinguishing media: Use water spray to cool fire-exposed containers. Use foam, dry chemical, or carbon dioxide. DO NOT USE WATER!
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Toxic hydrogen chloride and phosgene gases may form in fires. Reacts with water or steam to form hydrochloric acid. Vapor forms flammable mixture with air. May form explosive mixture in air. Avoid contact with water or moist air.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
4
 
Flammability
3
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
3
Exposure effects
   Ingestion
Aspiration hazard. May be harmful if swallowed.
   Inhalation
Causes respiratory tract irritation. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin
Causes severe skin irritation. Harmful if absorbed through the skin. Substance is rapidly absorbed through the skin. Causes redness and pain.
   Eyes
Causes severe eye irritation. May cause blindness. Causes redness and pain.

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. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1250
Response guide
Hazard class
3
PRTC
T
Packing Group
I
 
USCG CHRIS Code
MTS
 
HS Code
2931 00 95
 
Std. Transport #
4907630