LS : What is Flash Point (FP)?

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Topic: Chemical Safety 

Flash Point (FP)

Minimum temperature at which a llammable mixture of gas or vapor in air will momentarily flash when a source of ignition (spark) is introduced.

Auto ignition temperature (AIT)

Minimum temperature required to initiate self-sustained combustion of a solid, liquid or gas in the absence of a source of ignition,

LEL/LFL and UEL/UFL

Lower Explosive Limit (LEL) : or (Lower Flammable Limit)

Minimum concentration of vapor or gas in air which will burn when a source of ignition (spark) is introduced.

Upper Explosive Limit (UEL): or (Upper Flammable Limit)

Maximum vapor/gas to air concentration above which flame propagation will not occur, i.e. the mixture is “too rich” to bum.

Note-1: Flammable Gas Detectors (Meters) measure % LEL, hence actual LEL means 100% of full-scale reading of the meter. Below LEL (100% ol meter reading), a mixture is “low- rich" to bum,

Note-2: LEL of airborne combustible dust: If the dust obscures vision al a distance of 5 feel (1.52 m) or less it is considered as at LEL (ex. Sulfur or coke).