Assay (Na2HPO4) after drying, not less than................................... 98,0 %

pH of 1% solution.......................................................................... 8,4-9,6

Arsenic (as As), not more than........................................................ 3 ppm

Fluoride, not more than................................................................. 10 ppm

Loss on drying, not more than......................................................... 5,0 %

P2O5 content a.d.s........................................................................49-51 %

Insoluble substances a.d.s., not more than..................................... 0,2 %

Cadmium, not more than................................................................ 1 ppm

Lead, not more than........................................................................ 4 ppm

Mercury (Hg), not more than........................................................... 1 ppm