halogen free flame retardant  Ammonium polyphosphate ,It can be used in intumescent fireproof coatings, such as polyurethane, UP resin and epoxy resin. It can also be used in the retardant of fiber, wood and plastic products.  Due to its high molecular weight(n>1000) and good heat stability, APP can be used as main ingredient of expanding retardant thermoplastic. Especially used in the PP achieving UL94-V0 for electronic unit.