| ITEM | STANDARD |
| Appearance | White or whitelike powder |
| Assay | >=2.0% |
| Loss on Drying | =<6.0% |
| Seive Analysis | >=95% through No. 20 (US) |
| WATER (%) | =< 1.5 TEST METHOD Karl Fisher |
| Heavy metals | =<10mg/kg |
| Arsenic | =<2mg/kg |
| Pb | =<2mg/kg |
| Cadmium | =<2mg/kg |
| Mercury | =<2mg/kg |