Melamine (MEL), bis (trimethylsilyl) amine-modified MEL, ammonium polyphosphate (APP) and their ultra-high molecular weight polyethylene composite board manufacturers, these types of non-halogen flame retardants can be given to the whole water issue Bubble rigid polyurethane foam (PUR) certain flame resistance, but have declined foam compressive strength, compressive strength which modified water-blown MEL prepared a non-halogen flame retardant PUR decline least ultrahigh polyethylene sheet In MEL and APP modified to mass ratio 1:5 complex and the mass fraction of 10. 7%, the flame retardant properties of the resulting water-blown PUR best. The development of nature-type flame retardant products. Temperature group structure introduced in the polyurethane molecule chain, such as aromatic polyester polyols, using a catalyst of the molecule chains to form poly isocyanurate, polyimide-based, polyethylene oxazolone structure. These are high temperature polymer polyethylene sheet Buy ultrahigh can improve the flame resistance of polyurethane material itself. Compared with the conventional flame-retardant polyurethane, flame retardant nature volatile flame retardant polyurethane does not exist, dissolution, migration issues Supply of high polyethylene plate, high flame retardant efficiency and long lasting. Especially while introducing polymer molecules in such a variety of fire-retardant elements can produce a synergistic effect intramolecular retardant, flame-retardant effect better than adding more physical mixing flame produced.