Ammonium polyphosphate (APP) is a kind of Non-halogen environmental friendly fire retardant with the structure of phosphor and Nitrogen, this product has high degree of polymerization, nice heat stability and lower hygroscopic. 1. With the advantages of low smoke, innocently, high content of P N, good thermal stability (paralysis temperature at 290°C), small water-solubility, near neutral, good dispersive flame retardant, it is widely used as a safe environmental protection halogen-free flame retardant.2. As a flame-proof agent, it is mainly applied to flame-proof coatings, plastic, rubbers, wood paper etc., besides it can also be used as a highly concentrated NP fertilizer feed additive.