We supply ceramic grade STPP with good and stable quality at resonable price. The specification is as follows:1.PhysicalAppearance: White Powder2.Composition: Sodium Tri Poly Phosphates3.Na5P3O10: 94%4.P2O5:57%5.Fe: 100 ppm max6.Water insoluble: 5.00%7.Whiteness: 90%8.PH in 1% aqueous solution:9-10