| Identification | Positive for calcium |
| Assay, percent CaCO3 |
Not less than 98.0 Not more than 100.5 |
| Acid Insoluble Substances, percent | Not more than 2.5 |
| Arsenic (as As), mg/kg | Not more than 3 |
| Fluoride, percent | Not more than 0.005 |
| Heavy Metals (as Pb), percent | Not more than 0.002 |
| Lead, mg/kg | Not more than 3 |
| Loss on Drying, percent | Not more than 2.0 |
| Magnesium and Alkali Salts, percent | Not more than 3.5 |
| Mercury, mg/kg | Not more than 0.5 |
| Median Diameter, microns | 15 |