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Combustion temperatures of gases, vapours and
groups

Combustible gases and vapours are divided into classes according to their ignition temperature and into groups according to their explosive capacity. Motors and other electrical equipment are marked with the symbols used to indicate the protection mode, the enclosure group, and the temperature class, indicate the zone in which such equipment can be installed.


CLASSIFICATION OF THE MORE COMMON COMBUSTIBLE GASES AND VAPOURS
ACCORDING TO TEMPERATURE CLASS AND GROUP
Group Temperature classes
T1 T2 T3 T4 T5 T6
I Methane (firedamp)          
IIA Acetic acid
Acetone
Ammonia
Benzole
Benzene
Butanone
Carbon monoxide
Ethane
Ethyl acetate
Ethyl Chloride
Methane
Methanol
Methyl acetate
Methyl alcohol
Methyl Chloride
Naphthalene
Propane
Toluene
Xylene
Acetic anhydride
I amyl acetate
n butane
n butyl alcohol
Amylic alcohol
Butyl acetate
Cyclohexanon
Ethyl alcohol
Iso butylic alcohol
Liquefied gas
Natural gas
Propyl acetate
Cyclohexane
Cyclohexanol
Decane
Diesel fuels
Gasoline
Heating oil
Heptane
Hexane
Jet fuels
Pentane
Petroleum*
Acetaldehyde
Ether
   
IIB Coke-oven gas
Water gas
(carburetted)
1,3 - butadiene
Ethylene
Ethylbenzene
Ethylene oxide
Hydrogen sulphide
Isoprene
Petroleum*
Ethyl ether    
IIC Hydrogen Acetylene       Carbon disulphide
Ethyl nitrate
* depending on composition