International Chemical Safety Cards

HYDROGEN SELENIDE ICSC: 0284
HYDROGEN SELENIDE
Selenium hydride
(cylinder)
H2Se
Molecular mass: 81.0
CAS # 7783-07-5
RTECS # MX1050000
ICSC # 0284
UN # 2202
EC # 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 if indicated. 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 STORAGE PACKAGING & LABELLING
    Evacuate danger area! Consult an expert! Ventilation. NEVER direct water jet on liquid (extra personal protection: complete protective clothing including self-contained breathing apparatus).
    Fireproof. Separated from strong oxidants. Cool.

    T symbol
    R: 23/25-33
    S: 20/21-28-44
    Note: A
    UN Hazard Class: 2.3
    UN Subsidiary Risks: 2.1
    SEE IMPORTANT INFORMATION ON BACK
    ICSC: 0284 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

    International Chemical Safety Cards

    HYDROGEN SELENIDE ICSC: 0284

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    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 (OELs):
    TLV (as Se): 0.05 ppm; 0.16 mg/m3 (as TWA) (ACGIH 1992-1993).


    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 irritates 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

    N O T E S
    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.
    Transport Emergency Card: TEC (R)-20G12
    ADDITIONAL INFORMATION


    ICSC: 0284 HYDROGEN SELENIDE
    © IPCS, CEC, 1993
    IMPORTANT LEGAL NOTICE: Neither the CEC or 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. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.