Dodecyltrichlorosilane

  • Trichloro(dodecyl)silane
Formula
C12H25Cl3Si
Structure
Description
Dodecyltrichlorosilane is a colorless to yellow liquid with a pungent odor.
Uses
Intermediate for silicones.

Registry Numbers and Inventories.
CAS
4484-72-4
EC (EINECS/ELINCS)
224-769-9
S 26 36/37/39 45
RTECS
VV3940000
UN (DOT)
1771
Beilstein/Gmelin
1758004
Beilstein Reference
4-04-00-04255
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C12H25Cl3Si
Formula mass
303.77
Boiling point, °C
293
Vapor pressure, mmHg
0.004 (25 C)
Density
1.03 g/cm3 (20 C)
Solubility in water
Reacts
Refractive index
1.455 (20 C)
Partition coefficient, pKow
10.0
Heat of vaporization
50.7 kJ/mol
Heat of combustion
-7762 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
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 protective gloves and clothing and safety goggles.
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
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. 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
No data.
Incompatibilities
Keep away from oxidizing agents.

Fire.
Flash Point,°C
141
Fire fighting
Use dry chemical, dry sand, or carbon dioxide. 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. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Contact with metals may evolve flammable hydrogen gas.
Combustion products
Hydrochloric acid and phosgene fumes may form in fires.

Health.
Exposure effects
   Ingestion
Gastrointestinal tissue corrosion was observed in animals given single oral doses and may occur in humans following ingestion.
   Inhalation
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 irritation.

First aid
 
   Ingestion
If victim is conscious, give large amounts of water, then milk or milk of magnesia.
   Inhalation
Remove from exposure; support respiration; call physician if needed.
   Skin
Flush with water; obtain medical attention if skin is burned.
   Eyes
Flush with water for 15 min.; obtain medical attention immediately.

Transport.
UN number
1771
Response guide
Hazard class
8
Packing Group
II
 
USCG CHRIS Code
DTC
 
Std. Transport #
4934240