Level of flame retardant plastic has a lot of, are based on the raw material preparation by modification, such as flame retardant ABS, HIPS, flame retardant PP, PE, flame retardant PET, PBT, flame retardant PC, flame retardant PC/ABS alloy, etc., is now mainly a halogen flame retardant, halogen-free flame retardant research a lot, but the product stability and flame retardant effect remains to be improved. Flame retardant materials testing methods mainly include: the commonly used flame retardant materials testing methods, including horizontal and vertical burning method, oxygen index method, NBS smoke box method and thermal analysis method, cone calorimeter, and so on. The simplest is direct combustion, intuitive see is away from the fire that is quenched or continue to burn, burning time, etc.