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: NO. Indexes Industrial Grade Food Grade 1 Assay Na5P3O10 % ????94.0 95.0 2 P2O5 % ???? 57.0 57.0 3 Water Insoluble Matter %????0.1 0.05 4 Iron(Fe) %???? 0.01 0.01 5 PH value(1%water solution)9.2-10.0 9.5-10.0 6 Heavy metal (as Pb) %???? 0.001 7 Arsenic (As)%???? 0.0003 8 Fluoride (F) %???? 0.003 9 Particle Size Power:Through 16 mesh sieve %???? Through 35 mesh sieve %???? Through 100mesh sieve %???? Fine power: Through 100 mesh sieve %???? 95 90 4090 95 90 40 90 10 Whiteness %???? 90.0 90.0