These methods of test refer to solid electrical insulating materials and are intended to serve as a preliminary indication of their behaviour when exposed to an igniting source. The results make it possible to check the constancy of the characteristics of a material and provide an indication of the progress in the development of insulating materials and a relative comparison and classification of various materials. These methods are designed for quality control and product evaluation. They are not valid for determining the fire behaviour and the fire hazard of complete items of equipment, since the dimensions of the insulating systems, the design and heat transfer to adjacent metallic parts, etc., greatly influence the flammability of the electrical insulating materials used therein.