APP, MAP and DAP are the first choice for modern fire protection solutions. Ammonium polyphosphate (APP) is a multifunctional flame retardant that is widely used in coatings, polymers, cellulose materials and composites. Its flame retardant principle is achieved through gas phase and condensed phase effects, including ammonia release, carbonized layer formation and expansion mechanism. Dry powder coats the burning surface, blocking oxygen, and melts  to form a glossy coating that prevents re-ignition They are widely used in dry powder or solution-based fire extinguishers.