Definitions for "Flammability Limits"
Keywords:  ignition, combustion, ufl, lfl, flame
Minimum and maximum amounts of fuel (expressed as a percentage) in an air and fuel mixture within which combustion can take place.
The flammability range of a gas is defined in terms of its lower flammability limit (LFL) and its upper flammability limit (UFL). Between the two limits is the flammable range in which the gas and air are in the right proportions to burn when ignited. Below the lower flammability limit there is not enough fuel to burn. Above the higher flammability limit there is not enough air to support combustion.
means the range of concentrations of a flammable vapour in air at which a flame can be propagated or an explosion will occur, if a source of ignition is present. Normally expressed as upper and lower limits of this range, as percentage of the volume of vapour in air. The term 'explosive limits' means the same as 'flammability limits'.