The fire point of a fuel is the temperature at which it will continue to burn after ignition for at least 5 seconds. Fuel is any material that is burned or altered in order to obtain energy At the flash point, a lower temperature, a substance will ignite, but vapor might not be produced at a rate to sustain the fire. The flash point of a flammable liquid is the lowest Temperature at which it can form an ignitable mixture in air Fire point and autogenous ignition are additional considerations when selecting fire resistant greases. Industrially, fire point is the lowest temperature at which industrial greases produce sufficient vapors to form a mixture in air that continuously supports combustion after ignition.