Chlorodimethylsilane

  • Chlorodimethylhydrosilane
  • Dimethylchlorohydrosilane
  • Dimethylhydrosilyl chloride
  • Dimethylmonochlorosilane
  • Dimethylsilyl chloride
  • Silane, chlorodimethyl-
Formula
(CH3)2SiH(Cl)
Structure
Description
Clear, colorless liquid.

Registry Numbers and Inventories.
CAS
1066-35-9
EC (EINECS/ELINCS)
213-912-0
EC Class
extremely flammable, irritant
R 11 34 37
S 16 23 26 36/37/39 45
UN (DOT)
2924
Beilstein/Gmelin
1633434
Beilstein Reference
4-04-00-03991
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H7ClSi
Formula mass
94.62
Melting point, °C
-111
Boiling point, °C
34.6
Vapor pressure, mmHg
143 (20 C)
Density
0.863 g/cm3 (20 C)
Solubility in water
Reacts
Refractive index
1.38 (20 C)
Heat of vaporization
26.3 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. 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. Provide ventilation. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Disposal code
24
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents
Decomposition
Hydrogen chloride, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
-28
Upper exp. limit, %
20.0
Lower exp. limit, %
3.0
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. Containers may explode in the heat of a fire. Will be easily ignited by heat, sparks or flame. Containers may explode when heated. Extinguishing media: Use water spray to cool fire-exposed containers. For fires involving chlorosilanes a aqueous film forming foam (AFFF) may be used. DO NOT USE dry chemicals, soda ash, or lime on chlorosilane fires as they may release large quantities of hydrogen gas which may explode.
Fire potential
Flammable/combustible material. May be ignited by heat, sparks or flames.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
NIOSH TWA: 5 mg/m3
Exposure effects
   Ingestion
The toxicological properties of this substance have not been fully investigated.
   Inhalation
Vapors may cause dizziness or suffocation.
   Skin
No information regarding skin irritation and other potential effects was found.
   Eyes
No information regarding eye irritation and other potential effects was found.

First aid
 
   Ingestion
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
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
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
2924
Response guide
Hazard class
3
Packing Group
I; II; III
 
HS Code
2931 00 95
 
Std. Transport #
4907631