Product Identification

Product Name

Ethyltrichlorosilane

Synonyms

Trichloro(ethyl)silane
Trichloroethylsilane

CAS

115-21-9

Formula

C2H5Cl3Si

Molecular Weight

163.51

EINECS

204-072-6

RTECS

VV4200000

RTECS Class

Organometallic; Primary Irritant

Beilstein/Gmelin

1361384

Beilstein Reference

4-04-00-04227

Physical and Chemical Properties

Appearance

Colorless liquid.

Solubility in water

Reacts.

Melting Point

-105.6

Boiling Point

102

Vapor Pressure

43 (25 C)

Density

1.228 g/cm3 (19 C)

Partition Coefficient

4.72

Heat Of Vaporization

32.5 kJ/mol

Heat Of Combustion

-1633 kJ/mol

Usage

Chemical intermediate for silicones.

Vapor Density

5.6

Refractive Index

1.4233 (19.8 C)

First Aid Measures

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.

Handling and Storage

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.

Hazards Identification

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.

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.

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.

EC Risk Phrase

R 10 14 22 34

EC Safety Phrase

S 16 26 36/37/39 45

UN (DOT)

1196

Exposure Controls/Personal Protection

Personal 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).

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.

Poison Class

4

Fire Fighting Measures

Flash Point

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

Accidental Release Measures

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 and Reactivity

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.

Combustion Products

Combustion by-products include hydrogen chloride, other irritants, and toxic gases.

Transport Information

UN Number

1196

Hazard Class

3

Packing Group

II