... alkaline, and PH of 1% solution is 12.5. Relative density of Na3PO4.12H2O is1.62, and ... weight of 25 Kg or 50 Kg, store at a cool, dry and well ventilated place. Specifications: No. ... 98.0 98.0 2 P2O5%≥ 39.5 39.5 18.3 18.3 3 Sodium oxide, as Na2O36-40 ... 36-40 15.5-19 15.5-19 4 Sulfate, as ... SO4 %≤ 0.25 0.5 0.5 5 Heavy metal, as ...