Molecular formula: (NaPO3)n No. Of standard: HG/T 2519-2007 ItemSpecificationsPhosphorus pentoxide(P2O5), % ≥68.0Inactive phosphate(P2O5), % ≤7.5Water insoluble, % ≤0.04Iron (Fe) ,% ≤0.03pH(10g/L)5.8~7.0SolubilityPassAppearanceWhite Powder, granula or flake