Combustible 12
Combustible 12 : A term used by NFPA, DOT, and others to classify certain liquids that will burn, on a basis of flash points. Both NFPA and DOT generally define combustible liquids as having a flash point of 100oF (37.8oC) or higher. See also: Flammable. Nonliquid substances such as wood and paper are classified as ordinary combustibles by NFPA