descriptive term which implies that the described product, under accepted methods of test, will significantly: (a) reduce the rate of flame spread on the surface of a material to which it has been applied; (b) resist ignition when exposed to high temperatures; or (c) insulate a substrate to which it has been applied and prolong the time required to reach its ignition, melting, or structural weakening temperature, materjalile lisatud aine või materjali töötlus eesmärgiga takistada, oluliselt vähendada või aeglustada tule levimist