Product Identification

Product Name

Chlorodimethylsilane

Synonyms

Chlorodimethylhydrosilane
Dimethylchlorohydrosilane
Dimethylhydrosilyl chloride
Dimethylmonochlorosilane
Dimethylsilyl chloride
Silane, chlorodimethyl-

CAS

1066-35-9

Formula

C2H7ClSi

Molecular Weight

94.62

EINECS

213-912-0

Beilstein/Gmelin

1633434

Beilstein Reference

4-04-00-03991

EC Class

extremely flammable, irritant

Physical and Chemical Properties

Appearance

Clear, colorless liquid.

Solubility in water

Reacts

Melting Point

-111

Boiling Point

34.6

Vapor Pressure

143 (20 C)

Density

0.863 g/cm3 (20 C)

Heat Of Vaporization

26.3 kJ/mol

Refractive Index

1.38 (20 C)

First Aid Measures

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.

Handling and Storage

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.

Hazards Identification

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.

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.

EC Risk Phrase

R 11 34 37

EC Safety Phrase

S 16 23 26 36/37/39 45

UN (DOT)

2924

Exposure Controls/Personal Protection

Personal 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.

Exposure limit(s)

NIOSH TWA: 5 mg/m3

Fire Fighting Measures

Flash Point

-28

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.

Upper exp. limit

20

Lower exp. limit

3

Fire Potential

Flammable/combustible material. May be ignited by heat, sparks or flames.

Accidental Release Measures

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.

Stability and Reactivity

Disposal Code

24

Incompatibilities

Oxidizing agents

Stability

Stable under normal temperatures and pressures.

Decomposition

Hydrogen chloride, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, silicon oxide.

Combustion Products

Fire will produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2924

Hazard Class

3

Packing Group

I; II; III

HS Code

2931 00 95