Sodium tripolyphosphate (stpp)---tech grade Assay na5p3o10 % : 94.0 min P2 o 5 % : 57.0 min Water insoluble matter % : 0.15 max Iron(fe) % : 0.015 max Ph value (1% water solution): 9.2-10.0 Whiteness % : 90 min Ignition loss: 1.0 Density (g/cm3) 0.35-0.9 Phase i :10-30 Sodium tripolyphosphate (stpp)---food grade Assay na5p3o10 % : 94.0 min P2 o 5 % : 57.0 min Water insoluble matter % :0.05 max Iron(fe) % : 0.015 max Ph value (1% water solution) :9.5-10.0 Heavy metal (as pb) % : 0.001 max Arsenic (as) %: 0.0003 max Fluoride (f) %: 0.003 max 25kg/pp pe bag