Sodium Tripoly Phosphate (STPP) Name SODIUM TRIPOLY PHOSPHATE (STPP) Chemical Formula Na5P3O10appearance WHITE POWDER SPECIFICATIONs TESTING ITEM standard Assay Na5P3O10 ≥ 94.0 P205 %≥57wATER INSOLUBLE MATTER%≤ 0.15 PH VALUE 9.2-10.0IRON(Fe), % ≤ 0.01 WHITENESS % ≥ 90