Fire Point Definition

What Does Fire Point Mean?

Fire point is the temperature at which the vapor of a fuel will burn for 5 seconds.
Fire point is the temperature at which the vapor of a fuel will burn for 5 seconds. Steve Bronstein, Getty Images

Fire Point Definition

Fire point is the lowest temperature where the vapor of a liquid will initiate and sustain a combustion reaction. By definition, the fuel must continue to burn for at least 5 seconds following ignition by an open flame for the temperature to be considered the fire point.

Fire Point vs Flash Point

Contrast this with the flash point, which is a lower temperature at which a substance will ignite, but may not continue to burn.

The fire point for a specific fuel is not typically listed, while flash point tables are readily available. Generally, the fire point is about 10 C higher than the flash point, but if the value must be known, it should be determined experimentally.