... Food grade 2. Purity:94%min, 3.White odorless powder 4.Over 50 years factory Sodium Tripolyphosphate (STPP) Food GradeSpecificationFood grade Main ... , Mg, Cu and Fe 3. Application: 1). Technical grade: Used in such industries as oil field, paper-making, textile ... agglomerant, detergent and soil analytical chemical reagent; 2). Food grade: Mainly used as additive agent, pH adjusting agent, fermenting ...