... , Mg, Cu and Fe Application: 1. Technical grade: Used in such industries as oil field, paper-making, textile, dyeing, petrochemical industry, tanning ... , high temperature agglomerant, detergent and soil analytical chemical reagent; 2. Food grade: Mainly used as additive agent, pH adjusting agent, fermenting agent ... %≤ 0.0039Water insoluble %≤0.050.06 SHMP Sodium Hexametaphosphate 68% food grade