Dichlorosilane

  • Silicon chloride hydride
  • Chlorosilane
Formula
Cl2H2Si
Structure
Description
Colorless gas with a characteristic, irritating odor.

Registry Numbers and Inventories.
CAS
4109-96-0
EC (EINECS/ELINCS)
223-888-3
RTECS
VV3050000
RTECS class
Other
UN (DOT)
2189
Beilstein/Gmelin
25407 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Cl2H2Si
Formula mass
101.01
Melting point, °C
-122
Boiling point, °C
8.2
Vapor pressure, mmHg
549 (0 C)
Vapor density (air=1)
3.52
Density
1.42 g/cm3 (-122 C)
Solubility in water
Decomposes
Dipole moment
1.17 D
Heat of vaporization
25.2 kJ/mol

Hazards and Protection.
Storage
Keep separated from incompatible substances. Avoid heat, flames, sparks and other sources of ignition.
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.
Protection
Wear appropriate chemical protective clothing.
Respirators
Wear positive pressure self-contained breathing apparatus.
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
May polymerize violently or explosively.
Incompatibilities
Reacts with water or moist air to form HCl. Attacks many metals in presence of water.
Decomposition
The substance may spontaneously ignite on contact with air. Decomposes on heating or on burning producing toxic and corrosive fumes including HCl.

Fire.
Flash Point,°C
-35
Autoignition, °C
58
Upper exp. limit, %
99
Lower exp. limit, %
4.1
Fire fighting
Do not extinguish fire unless flow can be stopped. Do not apply water to point of leak in tank car or container. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use alcohol foam, dry chemical or carbon dioxide.
Fire potential
Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air.
Hazards
Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. May polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Some of these materials may react violently with water. Containers may explode when heated. Ruptured cylinders may rocket. Runoff may create fire or explosion hazard.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
4
 
Flammability
4
 
 
Reactivity
2
 
 
Special
W

Health.
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
Causes burns.
   Inhalation
Csore throat, cough, burning sensation, shortness of breath, labored breathing.. Corrosive to the respiratory tract. May cause lung edema. Exposure to high levels may result in death. Symptoms may be delayed.
   Skin
Redness, pain, burns, blisters. Exposure to liquid can cause serious frostbite.
   Eyes
Pain, redness, severe deep burns, loss of vision. Tear drawing.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2189
Response guide
Hazard class
2.3
PRTC
T
Std. Transport #
4920398