Indexes               Industrial Grade    Food Grade
Assay Na5P3O10 % ≥         94.0             94.0
P2O5 % ≥                   57.0             57.0
Water Insoluble Matter %≤  0.15             0.05
Iron(Fe) %≤                0.01             0.01
PH value(1% water solution) 9.2-10.0         9.5-10.0
Heavy Metal (as Pb) %≤     ----             0.001
Arsenic (As) %≤            ----             0.0003
Fluoride (F) %≤            ----             0.003
Whiteness %≥               90               90