Assay (complexometric): 99.0 - 101.0 % Insoluble Matter: 0.005 % pH-value: 3.5 - 6.0 Sulfate (SO4): 0.005 % Heavy Metals (as Pb): 0.0005 % Ca (Calcium): 0.001 % Cu (Copper): 0.0005 % Fe (Iron): 0.0005 % K (Potassium): 0.001 % Mg (Magnesium): 0.005 % Na (Sodium): 0.005 % Pb (Lead): 0.0005 % Zn (Zinc): 0.001 % Packing 50 lb bag, 44 bags per pallet