... synthetic wash 4, good quality at competitive price. STPP Sodium Tripolyphosphate high purity 94% white powderPacking:25kg pp bagSpecification: Na5P3O10,% ,Min.94P2O5 ... .5-10.0Iron (Fe), %, Max.0.015Fluoride (F), %, Max.0.003Chloride (Cl), %, Max.0.025Sulphate (as SO4), %, Max.0.4Bulk density, g/l650-990White ...