Sodium Tripolyphosphate 1. Food grade 2. Purity:94%min, 3.White odorless powder 4.Over 50 years factory Sodium Tripolyphosphate ( ... STPP) Food GradeSpecificationFood grade Main content, %,≥96.0 ... such as Ca, Ba, Mg, Cu and Fe 3. Application: 1). Technical grade: Used in such industries as oil field, paper-making ...