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
Whiteness % : 90 Min