Tri-Basic Magnesium Phosphate
| Grade | USP |
| Acid-insoluble Substances | 0.2% Max. |
| Identification | Positive to tests of Magnesium & Phosphates |
| Description | White, amorphous powder; odourless or almost odourless. |
| Water-Soluble Substances | 1.5% Max |
| Solubility | Practically insoluble in water and in ethanol (95%). It dissolves in dilute hydrochloric acidandin nitric acid. |
| Arsenic | 3 ppm Max |
| Heavy Metals | Max. 0.003% (30ppm) |
| Calcium | No Turbidity for 5 mins |
| Dibasic and Magnesium oxide | 14.8 to 15.4 ml of 1 N hydrochloric acid |
| Carbonate | No Effervescence |
| Nitrates | Blue colour persists for 5 mins |
| Barium | No Turbidity within 15 mins |
| Lead | Max. 5 ppm |
| Arsenic | Max. 3 ppm |
| Chlorides | 0.14% Max. |
| Sulphates | 0.6% Max. |
| Loss on Ignition | 20.0% to 27.0% |
| Assay as Mg3(PO4)2 | 98.0% to 101.5% |
| Microbial Test | No E. Coli Present |