A basic hydrated or a normal hydrated magnesium carbonate or a mixture of the two.
| Item | IP | USP | BP |
|---|---|---|---|
| Assay | NLT 40.0% and NMT 45.0% Of Mgo | 40.0% - 45.0% Calculated as Mgo | NLT 40.0% and NMT 43.5% Of Mgo |
| Identification | Positive | Positive | Positive |
| Volume | 15 gm occupies 180 ml volume | Passes the test | |
| Color of solution | Passes the test | Passes the test | Passes the test |
| Arsenic | 2PPM Max | 2 PPM Max | 4 PPM Max |
| Chlorides | 0.1% Max | 700PPM Max | |
| Calcium | 0.75% Max | 0.75% Max | 0.45% Max |
| Copper | Passes the test | ||
| Iron | 400PPM Max | 400PPM Max | 0.02% Max |
| Soluble substances | 1.0% Max | 1.0% Max | 1.0% Max |
| Heavy metals | 1 PPM Max As Pb | 20 PPM Max | 0.003% Max |
| Sulphate | 0.3% Max | 0.3% Max | |
| Bulk density | 15 gm / 180 ml | 150 gm / lit. |