Sodium TripolyPhosphate(STPP) Food GradeItemsUnitAnhydrous Standard ValueMain content≥%95P2O5≥%57Insoluble≤%0.05PH 9.5-10.0Sulfate≤%0.4Chloride≤%0.025As≤%0.0003Heavy metal(as Pb)≤%0.001Fluoride≤%0.003Whiteness≥%90 Use: Used as quality improver of cans, beverage, dairyproducts, bean curd; also as softener and thickener.