The lowest temperature in °C at which a liquid will produce enough vapor to ignite, if the vapor is flammable. The lower the flashpoint, the higher the risk of fire. Biodiesel has an abnormally high flashpoint (for a fuel), making it very safe to handle and store. Where diesel #2's flashpoint is standardized at 60°-80° C, biodiesel's standard is 100°-170° C.
The temperature at which a liquid will give off enough flammable vapor to ignite. There are several flash point test methods, and flash points may vary for the same material depending on the method used, so the test method is indicated when the flash point is given.