| M | 110.98 |
|---|

| White to off-white solid | Complying |
| Assay (on dry basis) | >= 95.0% |
| Alkalinity [as Ca(OH)2] | <= 5.0% |
| Arsenic (As) | <= 0.0003% |
| Heavy metals (as Pb) | <= 0.002% |
| Magnesium and Alkaline earth metals | <= 0.05% |
| Sulfate (SO4) | <= 0.01% |
| pH (5% in water) | 4.5-9.2 |