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DICHLOROSILANE ICSC: 0442
Date of Peer Review: April 1997

Chlorosilane
Silicon chloride hydride
(cylinder)
CAS # 4109-96-0 Cl2H2Si
RTECS # VV3050000 Molecular mass: 101.01
UN # 2189
EC Index #
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Extremely flammable. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames, NO sparks, and NO smoking.
Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with foam, powder.
EXPLOSION Gas/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting.
Combat fire from a sheltered position.
EXPOSURE
AVOID ALL CONTACT!

Inhalation Sore throat. Cough. Burning sensation. Shortness of breath. Laboured breathing. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Half-upright position. Refer for medical attention.
Skin Pain. Redness. Blisters. Skin burns. Serious frostbite.
Cold-insulating gloves. Protective clothing.
Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Pain. Redness. Severe deep burns. Loss of vision.
Safety goggles or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion


SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Personal protection: chemical protection suit including self-contained breathing apparatus.
Do not transport with food and feedstuffs.
EU Classification
UN Classification
UN Hazard Class: 2.3
UN Subsidiary Risks: 2.1 and 8

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20G2TFC
NFPA Code: H3; F4; R2; W
Fireproof. Keep in a well-ventilated room.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
DICHLOROSILANE ICSC: 0442
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS GAS, WITH CHARACTERISTIC ODOUR.

PHYSICAL DANGERS:
The gas is heavier than air and may travel along the ground; distant ignition possible.

CHEMICAL DANGERS:
The substance may spontaneously ignite on contact with air. The substance decomposes on heating or on burning producing toxic fumes including hydrogen chloride. Reacts with water or moist air to form hydrogen chloride. Attacks many metals in presence of water.

OCCUPATIONAL EXPOSURE LIMITS:
TLV not established.
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE:
Tear drawing. The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of this substance may cause lung oedema (see Notes). Rapid evaporation of the liquid may cause frostbite. Exposure at high levels may result in death. The effects may be delayed. Medical observation is indicated.

PHYSICAL PROPERTIES
Boiling point: 8C
Melting point: -122C
Solubility in water: reaction
Vapour pressure, kPa at 20C: 163.6
Relative vapour density (air = 1): 3.48
Flash point: -28C c.c.
Explosive limits, vol% in air: 4.1-99
ENVIRONMENTAL DATA

NOTES
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered. Card has been partly updated in October 2005. See section Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2005