Assay (Na3PO4) calc. on ignited basis, not less than...................... 92,0 %

pH of 1% solution...................................................................... 11,5-12,0

P2O5 content (a.a.s.)................................................................40,5-43,5 %

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

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

Loss on ignition......................................................................45,0-57,0 %

Insoluble substances, not more than............................................... 0,2 %

Heavy metals (as Pb), not more than............................................ 10 ppm

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

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

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