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HYDROGEN
(cylinder)
ICSC: 0001
Peer-Review Status: 11.04.2014 Validated
CAS #: 1333-74-0 RTECS #: MW8900000
UN #: 1049
EC #: 001-001-00-9
EINECS #: 215-605-7
    Formula: H2
Molecular mass: 2.0

TYPES OF HAZARD
/ EXPOSURE
ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE-FIGHTING
FIRE Extremely flammable. Many reactions may cause fire or explosion.  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 water spray, powder, carbon dioxide. 
EXPLOSION Gas/air mixtures are explosive.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Use non-sparking handtools. Do not handle cylinders with oily hands.  In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position. 
 
EXPOSURE   Use appropriate engineering controls.   
Inhalation Dizziness. Headache. Lethargy. Suffocation.  Use ventilation.  Fresh air, rest. 
Skin ON CONTACT WITH GAS: FROSTBITE.  Cold-insulating gloves.  ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer immediately for medical attention. 
Eyes ON CONTACT WITH GAS: FROSTBITE.  Wear face shield.  ON FROSTBITE: rinse with plenty of water. Refer immediately for medical attention. 
Ingestion      

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. Remove vapour with fine water spray.   
EC Classification
Symbol: F+; R: 12; S: (2)-9-16-33 
UN Classification
UN Hazard Class: 2.1 
GHS Classification
Signal: Danger
Extremely flammable gas
Contains gas under pressure; may explode if heated 
flam;flamecylinder;gas

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H0; F4; R0.  Fireproof. Cool. Ventilation along the floor and ceiling. Separated from oxidizing materials. 

IMPORTANT DATA
Physical State; Appearance
ODOURLESS COLOURLESS COMPRESSED GAS. 

Physical dangers
The gas mixes well with air, explosive mixtures are easily formed. The gas is lighter than air. 

Chemical dangers
Heating may cause violent combustion or explosion. Reacts violently with halogens, oxidizing materials and greases. This generates fire and explosion hazard. Metal catalysts, such as platinum and nickel, greatly enhance these reactions. 

Occupational exposure limits
TLV (SIMPLE-ASPHYXIANT): (ACGIH 2002). 

Routes of exposure
Exposure mainly occurs via inhalation. 

Inhalation risk
On loss of containment this substance can cause suffocation by lowering the oxygen content of the air in confined areas. 

Effects of short-term exposure
Asphyxiation. See Notes. Exposure to cold gas could cause frostbite. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: -253°C
Melting point: -259°C
Relative vapour density (air = 1): 0.07
Flash point: Flammable gas
Auto-ignition temperature: 560°C
Explosive limits, vol% in air: 4-75
Vapour pressure, kPa at 25°C: 165320
Solubility in water, mg/l at 21°C: 1.62 (very poor) 
 

NOTES
High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death.
Check oxygen content before entering the area.
Measure hydrogen concentrations with suitable gas detector (a normal flammable gas detector is NOT suitable for the purpose). 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.
    See Also:
       Toxicological Abbreviations