... with luster, melting point at 622 C, easily soluble in water, with remarkable chelating ability to some me STPP tech / ... month to many countries. It is used in detergent builder: soap synergistic agent, as soft syner agent, dye auxiliary agent, water softener, ... 0 94.0 2 P2O5 %≥ 57.0 57.0 3 Water insoluble %≤ 0.1 0.05 4 Iron, as Fe ... %≤ 0.015 0.01 5 pH of 1% water solution 9.2-10.0 9.5-10.0 6 ...