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METHANE ICSC: 0291
Date of Peer Review: October 2000

Methyl hydride
(cylinder)
CAS # 74-82-8 CH4
RTECS # PA1490000 Molecular mass: 16.0
UN # 1971
EC Index # 601-001-00-4
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 water spray, powder, carbon dioxide.
EXPLOSION Gas/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Use non-sparking handtools.
In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.
EXPOSURE


Inhalation Suffocation. See Notes.
Ventilation. Breathing protection if high concentration.
Fresh air, rest. 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. Refer for medical attention.
Eyes ON CONTACT WITH LIQUID: FROSTBITE.
Safety goggles.
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. Remove all ignition sources. Personal protection: self-contained breathing apparatus. NEVER direct water jet on liquid.
EU Classification
Symbol: F+
R: 12
S: (2-)-9-16-33
UN Classification
UN Hazard Class: 2.1

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20G1F
NFPA Code: H 1; F 4; R 0;
Fireproof. Cool. Ventilation along the floor and ceiling.
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
METHANE ICSC: 0291
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS, COMPRESSED OR LIQUEFIED GAS, WITH NO ODOUR.

PHYSICAL DANGERS:
The gas is lighter than air.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: Simple asphyxiant (ACGIH 2000).
MAK not established.
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
On loss of containment this gas can cause suffocation by lowering the oxygen content of the air in confined areas.

EFFECTS OF SHORT-TERM EXPOSURE:
Rapid evaporation of the liquid may cause frostbite.

PHYSICAL PROPERTIES
Boiling point: -161C
Melting point: -183C
Solubility in water, ml/100 ml at 20C: 3.3
Relative vapour density (air = 1): 0.6
Flash point: Flammable Gas
Auto-ignition temperature: 537C
Explosive limits, vol% in air: 5-15
Octanol/water partition coefficient as log Pow: 1.09
ENVIRONMENTAL DATA

NOTES
Density of the liquid at boiling point: 0.42 kg/l. High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death. Check oxygen content before entering area. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. After use for welding, turn valve off; regularly check tubing, etc., and test for leaks with soap and water. The measures mentioned in section PREVENTION are applicable to production, filling of cylinders, and storage of the gas. Other UN number: 1972 (refridgerated liquid), Hazard class: 2.1. Card has been partly updated in October 2005. See section 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
See Also:
        Methane (CHEMINFO)