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 ... oil field, paper-making, textile, dyeing, petrochemical industry, tanning industry, metallurgical industry and building material industry, and used as a water softening agent in ...