1 | Description | White crystalline powder. | White, crystalline powder, shining plates, or crystalline fragments. |
2 | Solubility | Passes | Freely soluble in water; insoluble in alcohol. |
3 | Identification by Chemical test | Complies | A solution (1 in 10) responds to the tests for aluminium and sulphate |
4 | pH | 3.15 | Not less than 2.9 |
5 | Water | 43.46% | Not less than 41.0% and not more than 46.0% |
6 | Heavy metals | NMT 20 ppm | 20ppm max |
7 | Limit of alkalies and alkaline earths | NMT 0.4% | 0.4% max |
8 | Limit of ammonium salts | Complies | The odor of ammonia is not perceptible. |
9 | Iron (Fe) | Complies | No blue color is produced immediately |
10 | Assay | 55.40% | Not less than 54.0% and not more than 59.0% of Al2O3 |