Specifies the details of the glow-wire test when applied to specimens of solid electrical insulating materials or other solid combustible materials for flammability testing. Applies to materials only, is not valid for complete items of equipment and, hence, does not apply to determining fire behaviour and fire hazard of equipment. The test results make it possible to provide a relative comparison of various materials according to their ability to estinguish flames on removal of the heated glow-wire and their ability not to produce flaming or glowing particles capable of spreading fire to a layer of wrapping tissue placed below.