... .SGS,BV certificate 3.COA available 4.Free sample available STPP sodium tripolyphosphatePROPERTIES White powder,melting point 622 deg C. Easily soluble ... I : 25-40PARTICLE SIZE(RETENTION ON 20 MESH) ≤ 0.5%STPP Sodium Tripolyphosphate: Na5P3O10,% ,Min.94P2O5,% ,Min.57Insolubles, % Max.0.05PH Value ... .4Bulk density, g/l650-990White degree %,Min.93Phase I10-30 stpp sodium tripolyphosphate STTP