Formula (NH4)2HPO4, MW 132.0, CAS 7783-28-0. White granular crystals, density 1.619, m.p. 155 degC, easily soluble in water and insoluble in alcohol. Mainly used as fire retardant for wood, paper and fabrics and as fire-retardant coating additive; also a raw material for high-polymerization ammonium polyphosphate. In agriculture it is a chlorine-free N-P binary compound fertilizer with total nutrients (N+P2O5) up to 74%, an excellent base material for NPK compound fertilizers. Packed in 25/50/1000 kg plastic-lined woven bags.
