| ITEM | STANDARD | |
| Appearance | White Powder | |
| Assay | 99.0 ~ 100.5% | |
| Loss on Drying | =< 4% | |
| Acidity and Alkalinity | =< 0.1% | |
| PH (10%Solution ) | 7.0-9.0 | |
| Insoluble in Water | =< 0.15% | |
| Heavy Metals (as Pb) | =< 10 ppm | |
| Arsenic (as As) | =< 3 ppm | |
| Lead | =< 2 ppm | |
| Mercury | =< 1 ppm | |
| Iron | =< 5 ppm | |
| Fluoride | =< 3 ppm | |
| Magnesium | =< 0.4% | |