ICSC 0442 - DICHLOROSILANE

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DICHLOROSILANE	ICSC: 0442 (July 1997)
Chlorosilane Silicon chloride hydride

CAS #: 4109-96-0

UN #: 2189

EC Number: 223-888-3

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Extremely flammable. Gives off irritating or toxic fumes (or gases) in a fire. Gas/air mixtures are explosive.	NO open flames, NO sparks and NO smoking. Closed system, ventilation, explosion-proof electrical equipment and lighting.	Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out. In other cases extinguish with foam, powder. Combat fire from a sheltered position.

AVOID ALL CONTACT!
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Sore throat. Cough. Burning sensation. Shortness of breath. Laboured breathing. Symptoms may be delayed. See Notes.	Use ventilation, local exhaust or breathing protection.	Fresh air, rest. Half-upright position. Refer for medical attention.
Skin	Pain. Redness. Blisters. Skin burns. 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.	Wear 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 refer for medical attention.
Ingestion

SPILLAGE DISPOSAL	CLASSIFICATION & LABELLING
Evacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Ventilation.	According to UN GHS Criteria Transportation UN Classification UN Hazard Class: 2.3; UN Subsidiary Risks: 2.1 and 8
STORAGE
Fireproof. Keep in a well-ventilated room.
PACKAGING
Do not transport with food and feedstuffs.

DICHLOROSILANE

ICSC: 0442

PHYSICAL & CHEMICAL INFORMATION
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 ignite spontaneously on contact with air. Decomposes on heating and on burning. This produces toxic fumes including hydrogen chloride. Reacts with water and moist air. This produces hydrogen chloride. Attacks many metals in the presence of water.	Formula: Cl₂H₂Si Molecular mass: 101.01 Boiling point: 8°C Melting point: -122°C Solubility in water: reaction Vapour pressure, kPa at 20°C: 163.6 Relative vapour density (air = 1): 3.48 Flash point: -28°C c.c. Explosive limits, vol% in air: 4.1-99

PHYSICAL & CHEMICAL INFORMATION

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 ignite spontaneously on contact with air. Decomposes on heating and on burning. This produces toxic fumes including hydrogen chloride. Reacts with water and moist air. This produces hydrogen chloride. Attacks many metals in the presence of water.

Formula: Cl₂H₂Si
Molecular mass: 101.01
Boiling point: 8°C
Melting point: -122°C
Solubility in water: reaction
Vapour pressure, kPa at 20°C: 163.6
Relative vapour density (air = 1): 3.48
Flash point: -28°C c.c.
Explosive limits, vol% in air: 4.1-99

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation. Effects of short-term exposure Lachrymation. The substance is corrosive to the eyes, skin and respiratory tract. Inhalation may cause lung oedema. See Notes. Rapid evaporation of the liquid may cause frostbite. Exposure at high levels could cause death. The effects may be delayed. Medical observation is indicated.	Inhalation risk A harmful concentration of this gas in the air will be reached very quickly on loss of containment. Effects of long-term or repeated exposure

EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation.

Effects of short-term exposure
Lachrymation. The substance is corrosive to the eyes, skin and respiratory tract. Inhalation may cause lung oedema. See Notes. Rapid evaporation of the liquid may cause frostbite. Exposure at high levels could cause death. The effects may be delayed. Medical observation is indicated.

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

Effects of long-term or repeated exposure

OCCUPATIONAL EXPOSURE LIMITS

ENVIRONMENT

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 by an authorized person, should be considered.

ADDITIONAL INFORMATION

EC Classification

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