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HYDROGEN SELENIDE
(cylinder)
ICSC: 0284
Peer-Review Status: 20.09.1993 Validated
Selenium hydride 
CAS #: 7783-07-5 RTECS #: MX1050000
UN #: 2202
EC #: 034-002-00-8
EINECS #: 231-978-9
    Formula: H2Se
Molecular mass: 81.0

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Extremely flammable.  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 powder, carbon dioxide. 
EXPLOSION Gas/air mixtures are explosive.  Closed system, ventilation, explosion-proof electrical equipment and lighting.  In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position. 
 
EXPOSURE   STRICT HYGIENE!   
Inhalation Burning sensation. Cough. Laboured breathing. Nausea. Sore throat. Weakness.  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
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. NEVER direct water jet on liquid.   
EC Classification
Symbol: T, N; R: 23/25-33-50/53; S: (1/2)-20/21-28-45-60-61; Note: A 
UN Classification
UN Hazard Class: 2.3; UN Subsidiary Risks: 2.1 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-20G2TF.  Fireproof. Separated from strong oxidants. Cool. 

IMPORTANT DATA
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). 

Occupational exposure limits
TLV: 0.05ppm as TWA; (ACGIH 2004).
MAK: 0.015 ppm, 0.05 mg/m³; Carcinogen category: 3B; Peak limitation category: I(2); Pregnancy risk group: C; (DFG 2004). 

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

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

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. 

Effects of long-term or repeated exposure
The substance may have effects on the liver. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
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 
 

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.
Card has been partly updated in October 2005.
See sections Occupational Exposure Limits, EU classification, Emergency Response. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.
    See Also:
       Toxicological Abbreviations