Ethyltrichlorosilane

  • Trichloroethylsilane
  • Trichloro(ethyl)silane
Formula
C2H5Cl3Si
Structure
Description
Colorless liquid.
Uses
Chemical intermediate for silicones.

Registry Numbers and Inventories.
CAS
115-21-9
EC (EINECS/ELINCS)
204-072-6
R 10 14 22 34
S 16 26 36/37/39 45
RTECS
VV4200000
RTECS class
Organometallic; Primary Irritant
UN (DOT)
1196
Beilstein/Gmelin
1361384
Beilstein Reference
4-04-00-04227
Swiss Giftliste 1
G-2156
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H5Cl3Si
Formula mass
163.51
Melting point, °C
-105.6
Boiling point, °C
102
Vapor pressure, mmHg
43 (25 C)
Vapor density (air=1)
5.6
Critical temperature
286.8
Critical pressure
32.9
Density
1.228 g/cm3 (19 C)
Solubility in water
Reacts.
Surface tension
25 g/s2
Refractive index
1.4233 (19.8 C)
Partition coefficient, pKow
4.72
Heat of vaporization
32.5 kJ/mol
Heat of combustion
-1633 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated location. Separate from acids, alkalies, oxidizing materials, and water. Protect containers against physical damage. Outdoor or detached storage with containers sealed tightly is preferred. Indoor storage should be in a standard flammable liquid storage room.
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
Those who have to handle chlorosilanes should wear goggles and if necessary a gas mask. Handling should be done as far as possible under suitably ventilated hoods. Chlorosilanes wear special protective clothing and positive pressure self-contained breathing apparatus. Acid-vapor-type respiratory protection; rubber gloves; chemical worker's goggles; other equipment as necessary to protect skin and eyes.
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
No data.
Incompatibilities
Reacts with water to produce hydrogen chloride. Reacts violently with a broad range of materials. Reacts with surface moisture to form hydrogen chloride, which is corrosive to common metals.
Decomposition
Dangerous when heated to decomposition, it emits highly toxic fumes of phosgene. Readily decomposes with evolution of hydrochloric acid gas.

Fire.
Flash Point,°C
20
Fire fighting
Enter fire areas with extreme care. Full protective clothing must be worn including self-contained breathing apparatus, rubber gloves, boots, and bands around arms, legs, and waist. No skin surface should be exposed. Isolate for 1/2 mile in all directions if tank car or truck is involved in fire.(Caution: reacts with water to produce heat and toxic and corrosive fumes.) Use dry chemical, alcohol foam, or carbon dioxide; water may be ineffective, but water should be used to keep fire-exposed containers cool. If a leak or spill has not ignited, use water spray to disperse the vapors and to protect men attempting to stop a leak. Water spray may be used to flush spills away from exposure and to dilute spills to non-flammable mixtures.
Fire potential
Flammable liquid
Hazards
Trichloroethylsilane may form explosive mixtures with air. Its vapors are heavier than air and may travel a considerable distance to a source of ignition and flash back. Form toxic and corrosive fumes including phosgene when heated to decomposition and hydrochloric acid in presence of water. Will react with water or steam to produce heat and toxic and corrosive fumes. Will react vigorously with oxidizing materials. Unstable, avoid decomposing heat.
Combustion products
Combustion by-products include hydrogen chloride, other irritants, and toxic gases.
Health
3
 
Flammability
3
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
4
Exposure effects
Circulatory collapse, and weak and rapid pulse may follow ingestion and possibly exposure by other routes. No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation.
   Ingestion
Nausea, vomiting, and epigastric pain may result from ingestion. Burns, strictures, and stenosis may develop. Gastrointestinal tissue corrosion was observed in animals given single oral doses.
   Inhalation
Dyspnea and pulmonary edema may develop. Rats exposed to vapors of chlorosilanes developed shallow and difficult respiration.
   Skin
Severe burns, with complete denaturation and tissue sloughing, may occur within two to three minutes after exposure.
   Eyes
Trichloroethylsilane is irritating to the eyes, nose, and throat. Corrosion of oral membranes, with gray- to white discoloration of tissue, may occur with ingestion. Rats exposed to vapors of chlorosilanes developed nasal discharge, tearing, salivation, and pulmonary irritation.

First aid
 
   Ingestion
Do not induce vomiting - following ingestion and/or prior to gastric evacuation, immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 15 ml/kg in a child).
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing, wash exposed area with copious amounts of water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
1196
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
ETS
 
Std. Transport #
4907620