Historical
NFPA 255-1996
NFPA 255: Standard Method of Test of Surface Burning Characteristics of Building Materials, 1996 Edition
Describes a method of test of surface burning characteristics of building materials that is applicable to any type of building material that, by its own structural quality or the manner in which it is applied, is capable of supporting itself in position or may be supported in the test furnace to a thickness comparable to its recommended use.
National Fire Protection Association [nfpa]