Ammonium Dihydrogen Phosphate NH4H2PO4 Used as fertilizer, flame retardant, with enamel glaze, fire-resistant coating. Name:Ammonium ... .5). Applications and Usages: With highly effective nitrogen phosphorus compound fertilizer. Used as fire retardant of wood, paper and fabric; dispersant ... : 10 Zhongyaocun, Jiguanshi, Nan'an dist., Chongqing, China Ammonium Dihydrogen Phosphate