Product Identification

Product Name

Dichlorodimethylsilane

Synonyms

Dichloro(dimethyl)silane
Dichlorodimethylsilane

CAS

75-78-5

Formula

C2H6Cl2Si

Molecular Weight

129.06

EINECS

200-901-0

RTECS

VV3150000

RTECS Class

Primary Irritant

Beilstein/Gmelin

605287

Beilstein Reference

4-04-00-04111

EC Index Number

014-003-00-X

EC Class

Highly flammable; Irritant

Physical and Chemical Properties

Appearance

A colorless fuming liquid with a pungent odor.

Solubility in water

Insoluble

Melting Point

-76

Boiling Point

70

Vapor Pressure

144 (25 C)

Density

1.0745 g/cm3 (20 C)

Partition Coefficient

3.18

Heat Of Vaporization

29.9 kJ/mol

Heat Of Combustion

-1792 kJ/mol

Usage

In ethchlorvynol assay.

Vapor Density

4.4

Refractive Index

1.3998 (20 C)

First Aid Measures

Ingestion

Do NOT induce vomiting. 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

Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.

Skin

Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated 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 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

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Use spark-proof tools and explosion proof equipment. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Take precautionary measures against static discharges. Do not ingest or inhale. Do not allow contact with water. Use only in a chemical fume hood. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.

Hazards Identification

Ingestion

May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May be harmful if swallowed.

Inhalation

May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.

Skin

Causes skin burns.

Eyes

Causes eye burns. Lachrymator.

Hazards

Vapor may explode if ignited in an enclosed area. Reacts vigorously with water to generate hydrogen chloride. Hydrogen chloride and phosgene gases may be formed upon heating or in fire. Runoff to sewer may create fire or explosion hazard.

EC Risk Phrase

R 11 36/37/38

UN (DOT)

1162

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 a chemical apron. 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.

Poison Class

1

Fire Fighting Measures

Flash Point

-12

Autoignition

425

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Reacts violently with water. Contact with metals may evolve flammable hydrogen gas. Extinguishing media: DO NOT USE WATER! Do NOT get water inside containers. For large fires, use water spray, fog or alcohol-resistant foam. For small fires, use carbon dioxide, dry chemical, dry sand, or alcohol-resistant foam. Cool containers with flooding quantities of water until well after fire is out.

Upper exp. limit

40

Lower exp. limit

3.1

Fire Potential

HIGHLY FLAMMABLE: Will be easily 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. Clean up spills immediately, using the appropriate protective equipment. Scoop up with a nonsparking tool, then place into a suitable container for disposal. Remove all sources of ignition. Do not expose spill to water. Do not get water inside containers.

Stability and Reactivity

Disposal Code

24

Incompatibilities

Acids, alcohols, amines, strong bases, esters, ketones, aldehydes, acetone, ammonia, and strong oxidizing agents. Reacts violently with water to liberate an acidic gas which in contact with metal surfaces can generate flammable or explosive hydrogen gas.

Stability

Stable under normal temperatures and pressures.

Decomposition

Hydrogen chloride, chlorine, phosgene, 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

1162

Hazard Class

3

Packing Group

II

HS Code

2931 00 95