Ethyldichlorosilane

  • Dichloroethylsilane
  • Silane, dichloroethyl
Formula
C2H6Cl2Si
Structure
Description
A colorless fuming liquid with a pungent odor.
Uses
Chemical intermediate for silicones.

Registry Numbers and Inventories.
CAS
1789-58-8
EC (EINECS/ELINCS)
217-255-0
UN (DOT)
1183
Beilstein/Gmelin
1731680
Beilstein Reference
4-04-00-04147
Canada DSL/NDSL
NDSL
US TSCA
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H6Cl2Si
Formula mass
129.06
Melting point, °C
-107
Boiling point, °C
75.5
Vapor pressure, mmHg
50 (6 C)
Vapor density (air=1)
4.45
Density
1.092 g/cm3 (20 C)
Solubility in water
Reacts
Surface tension
21.7 g/s2 (20 C)
Refractive index
1.4188 (20 C)
Heat of vaporization
29.9 kJ/mol
Heat of combustion
-1866 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Keep refrigerated. Store in a tightly closed container. Keep under a nitrogen blanket. Flammables-area. Do not store in metal containers.
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 protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
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. Do not use water on material itself. Neutralize spilled material with crushed limestone, soda ash, or lime.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Keep away from water, alcohols, acids, oxidizers, platinum, platinum and iron salts.
Decomposition
Irritating fumes of HCl and organic acid vapors may develop if this material is exposed to water or open flame.

Fire.
Flash Point,°C
-9.4
Fire fighting
Do not extinguish fire unless flow can be stopped. Use alcohol foam, dry chemical or carbon dioxide. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Difficult to extinguish; re-ignition may occur. Contact with water applied to adjacent fires produces irritating hydrogen chloride fumes and flammable hydrogen gas.
Combustion products
Toxic hydrogen chloride and phosgene gases may be formed.
Health
3
 
Flammability
3
 
 
Reactivity
2
 

Health.
Exposure effects
   Ingestion
Gastrointestinal tissue corrosion was observed in animals given single oral doses and may occur in humans following ingestion.
   Inhalation
Three cases of permanently disabling reactive airway syndrome have been reported in adults exposed for several hours to fumes of sodium hydroxide, trichlorosilane, and silicon tetrachloride.
   Skin
The application of chlorosilanes to shaved rabbit skin produced various degrees of irritation. Complete denaturation and tissue sloughing occurred within one minute after exposure to dichlorodimethylsilane, within two to three minutes after exposure to methyltrichlorosilane, ethyltrichlorosilane, and dichlorodiethylsilane, and within 10 minutes after exposure to tetrachlorosilane.
   Eyes
May cause burns.

First aid
 
   Ingestion
Dilution: immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 4 ounces/120 ml in a child). Do not induce vomiting.
   Inhalation
Remove to fresh air; give artificial respiration if required.
   Skin
Flush with water.
   Eyes
Flush with water for 15 min.

Transport.
UN number
1183
Response guide
Hazard class
4.3
Packing Group
I
 
USCG CHRIS Code
ECS
 
Std. Transport #
4916356