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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A

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 100°C 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 20°C.

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: -41°C
Melting point: -66°C
Relative density (water = 1): 2.1 (as liquid)
Solubility in water, ml/100 ml at 22.5°C: 270

Vapour pressure, kPa at 21°C: 878
Relative vapour density (air = 1): 2.8
Flash point: Flammable Gas

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.