International Chemical Safety Cards

HYDROGEN SELENIDE ICSC: 0284
World Health Organization (WHO) International Labour Organization (ILO) United Nations Environmental Programme (UNEP) European Commission National Institute for Occupational Safety and Health (NIOSH)
Selenium hydride
H2Se
Molecular mass: 81.0
(cylinder)
2 Flammable Gas placard 2 Poison Gas placard ICSC #    0284
CAS #     7783-07-5
RTECS # MX1050000
UN #        2202
EC #         034-002-00-8
September 20, 1993 Validated
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 STORAGE 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.
Fireproof. Separated from strong oxidants. Cool.

Note: A
T symbol
N symbol
R: 23/25-33-50/53
S: 1/2-20/21-28-45-60-61
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 (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards

HYDROGEN SELENIDE ICSC: 0284
I

M

P

O

R

T

A

N

T


D

A

T

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 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).
OSHA PEL: TWA 0.05 ppm (0.2 mg/m3)
NIOSH REL: TWA 0.05 ppm (0.2 mg/m3)
NIOSH IDLH: 1 ppm See: 7783075


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

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. Card has been partly updated in October 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response.
Transport Emergency Card: TEC (R)-20G2TF
ADDITIONAL INFORMATION


ICSC: 0284 HYDROGEN SELENIDE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, 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. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.