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HYDROGEN SELENIDE ICSC: 0284
Date of Peer Review: September 1993

Selenium hydride
(cylinder)
CAS # 7783-07-5 H2Se
RTECS # MX1050000 Molecular mass: 81.0
UN # 2202
EC Index # 034-002-00-8
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.
Closed system and 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.
Safety goggles or face shield.
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. NEVER direct water jet on liquid. Personal protection: complete protective clothing including self-contained breathing apparatus.
EU 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

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20G2TF
Fireproof. Separated from strong oxidants. Cool.
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
HYDROGEN SELENIDE ICSC: 0284
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:
The substance decomposes on heating above 100C producing toxic and flammable products including Selenium (ICSC 0072) and Hydrogen (ICSC 0001). The substance is a strong reducing agent and reacts violently with oxidants causing fire and explosion hazard. On contact with air it emits toxic and corrosive fumes of selenium dioxide (ICSC 0946).

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.05 ppm as TWA; (ACGIH 2004).
MAK: 0.015 ppm, 0.05 mg/m; Peak limitation category: I(2); Carcinogen category: 3B; 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 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes and the respiratory tract. Inhalation of the gas may cause pneumonitis. Exposure at high levels may result in death.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the liver.
PHYSICAL PROPERTIES
Boiling point: -41C
Melting point: -66C
Relative density (water = 1): 2.1 (as liquid)
Solubility in water, ml/100 ml at 22.5C: 270
Vapour pressure, kPa at 21C: 878
Relative vapour density (air = 1): 2.8
Flash point: Flammable Gas
ENVIRONMENTAL DATA

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


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