... Cu and FeUse: 1. Technical grade: Used in such industries as oil field, paper-making, textile, dyeing, petrochemical industry ... agglomerant, detergent and soil analytical chemical reagent;2. Food grade: Mainly used as additive agent, pH adjusting agent ... , fermenting agent, and nourishment, etc.Industrial and Food Grade Specifications: Index nameFood GradeIndustrial gradeMain content (based on P2O5 ...