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| 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 |