Sodium Hexametaphosphate (SHMP) 1,Manufacturer 2,Free sample 3,68%,white powder 4,High ... P2O5%<=7.57.53Iron, as Fe %<=0.050.054Ph value (1% solution) %<=5.8-7.35.8-6.55SolubilityQualifiedQualified6Heavy metals, as Pb ... .06Uses: Tech Grade used as a water softening agent in solution for printing,dyeing, and boiler; diffusant in papermaking;slow corrodent ...