Upper Flammable Limit (UFL) | AIChE

Upper Flammable Limit (UFL)

The highest concentration of a vapor or gas (the highest percentage of the substance in air) that will produce a flash of fire when an ignition source (heat, arc, or flame) is present. See also Lower Flammable Limit. At concentrations higher than the UFL, the mixture is too rich to burn. Also known as the Upper Explosive Limit (UEL)

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