... , high temperature agglomerant, detergent and soil analytical chemical reagent; 2. Food grade: Mainly used as additive agent, pH adjusting agent, fermenting ... , as P2O5%≤7.57.53Iron, as Fe %≤0.050.054Ph value (1% solution) %≤5.8-7.35.8-6.55SolubilityQualifiedQualified6Heavy metals ... %≤ 0.0039Water insoluble %≤0.050.06 SHMP Sodium Hexametaphosphate 68% food grade