Flammable gas and vapours

Depending on the minimum ignition energy of the gas,
the gases are classified in gas groups.
GROUP I        Methane (mining)
GROUP IIA     Gases with minimum ignition energy more than 80μJ. (e.g. Propane)
GROUP IIB   Gases with minimum ignition energy from 45 to 80μJ. (e.g. Ethylene)
GROUP IIC    Gases with minimum ignition energy less than 45μJ.(e.g. Hydrogene)


View safety characteristics of flammable gas and vapours here