| Name of index | GB25558-2010 | FCC-V |
| Appearance | white floating, amorphous powder | |
| content(Ca),% | 34.0-40.0 | 34.0-40.0 |
| As,≤ % | 0.0003 | 0.0003 |
| F,≤ % | 0.0075 | 0.0075 |
| Heavy metals(Pb),≤% | 0.001 | - |
| Pb,≤ % | 0.0002 | 0.0002 |
| Loss on Ignition (800ºC) ≤ % | 10.0 | 10.0 |
| Clear grade | Slightly turbid | - |
| Size | 95%min thru 325 mesh | 95%min thru 325 mesh |