| Item | index |
|
appearance |
fine white powder; soluble in methylbenzene, ethyl alcohol and other organic solvent |
| calcium content, % | 6.0-7.1 |
| Ash content,% | 9.0-10.0 |
| free acid, % | ≤0.5 |
| loss on drying, % | ≤3.0 |
| melting point, ºC | 145.0~158.0 |
| *fineness, % | 325 mesh ≥99.0 |