... °C,it may lose crystal water, convert to anhydrous.5,Packing: 25kg net paper bag or 1mt ... (as dry base),≥%98.098.0 P2O5 Content(Anhydrous basis) ,%--49.0-51.0Lead, ≤%0.00040 ... 20.2Fluoride, ≤%0.0050.001Loss on drying,1,Anhydrous:≤5.0%;2,Dihydrate:18.0%-22.0%. ... (120°C,4h)1,Anhydrous ≤5.0%,2,Dihydrate ≤22.0%3,Heptahydrate ... .00030.0003Cadmium ≤%--0.0001Mercury ≤%--0.0001 disodium phosphate