ICSC 0284 - HYDROGEN SELENIDE

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HYDROGEN SELENIDE	ICSC: 0284 (April 2017)
Selenium hydride

CAS #: 7783-07-5

UN #: 2202

EC Number: 231-978-9

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Extremely flammable. 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 powder, carbon dioxide. In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.

STRICT HYGIENE!
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Burning sensation. Cough. Sore throat. Metallic taste. Laboured breathing. Nausea. Weakness. Garlic odour.	Use closed system or ventilation.	Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.
Skin	ON CONTACT WITH LIQUID: FROSTBITE.	Cold-insulating gloves.	ON FROSTBITE: rinse with plenty of water, do NOT remove clothes.
Eyes	Redness. Pain.	Wear safety goggles or face shield.	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: complete protective clothing including self-contained breathing apparatus. Ventilation. NEVER direct water jet on liquid.	According to UN GHS Criteria DANGER Extremely flammable gas Contains gas under pressure; may explode if heated Fatal if inhaled Causes eye irritation May cause respiratory irritation Transportation UN Classification UN Hazard Class: 2.3; UN Subsidiary Risks: 2.1
STORAGE
Fireproof. Separated from strong oxidants. Keep in the dark. Cool.
PACKAGING

HYDROGEN SELENIDE

ICSC: 0284

PHYSICAL & CHEMICAL INFORMATION
Physical State; Appearance COLOURLESS COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR. Physical dangers The gas is heavier than air and may travel along the ground; distant ignition possible. Chemical dangers Decomposes above 100°C . This produces toxic and flammable products including selenium (ICSC 0072) and hydrogen (ICSC 0001). The substance is a strong reducing agent. It reacts violently with oxidants. This generates fire and explosion hazard. Contact with air generates toxic and corrosive fumes of selenium dioxide (see ICSC 0946).	Formula: H₂Se Molecular mass: 81.0 Boiling point: -41°C Melting point: -66°C Relative density (water = 1): 2.1 (liquid) Solubility in water, ml/100ml at 22.5°C: 270 Vapour pressure, kPa at 21°C: 878 Relative vapour density (air = 1): 2.8 Flash point: Flammable gas

PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR.

Physical dangers
The gas is heavier than air and may travel along the ground; distant ignition possible.

Chemical dangers
Decomposes above 100°C . This produces toxic and flammable products including selenium (ICSC 0072) and hydrogen (ICSC 0001). The substance is a strong reducing agent. It reacts violently with oxidants. This generates fire and explosion hazard. Contact with air generates toxic and corrosive fumes of selenium dioxide (see ICSC 0946).

Formula: H₂Se
Molecular mass: 81.0
Boiling point: -41°C
Melting point: -66°C
Relative density (water = 1): 2.1 (liquid)
Solubility in water, ml/100ml at 22.5°C: 270
Vapour pressure, kPa at 21°C: 878
Relative vapour density (air = 1): 2.8
Flash point: Flammable gas

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation. Effects of short-term exposure The substance is irritating to the eyes and respiratory tract. Inhalation of this gas may cause pneumonitis. Exposure at high levels could cause death.	Inhalation risk A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. 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
The substance is irritating to the eyes and respiratory tract. Inhalation of this gas may cause pneumonitis. Exposure at high levels could cause death.

Inhalation risk
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C.

Effects of long-term or repeated exposure

OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.05 ppm as TWA. MAK: 0.02 mg/m³, 0.006 ppm; peak limitation category: II(8); carcinogen category: 3; pregnancy risk group: C. EU-OEL: 0.07 mg/m³, 0.02 ppm as TWA; 0.17 mg/m³, 0.05 ppm as STEL

ENVIRONMENT

NOTES
The odour warning when the exposure limit value is exceeded is insufficient. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.

ADDITIONAL INFORMATION

EC Classification
Symbol: T, N; R: 23/25-33-50/53; S: (1/2)-20/21-28-45-60-61; Note: A

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