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HYDROGEN SELENIDEICSC: 0284
Selenium hydrideApril 2017
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

flam;flamecylinder;gasskull;toxic
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 


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: 3B; 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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       Toxicological Abbreviations