1. M. F. : Ca3(PO4)2 ; Ca5OH(PO4)3; Ca10(OH)2(PO4)6
2. M. W. : Ca3(PO4)2 310.18
M. W. : Ca5OH(PO4)3 502.31
M. W. : Ca10(OH)2(PO4)6 1004.61
3. CAS: [7758-87-4]; CAS: [1306-06-5]; CAS: [62974-97-4]
4. Physical properties: Mixture of different phosphorus calcium, white powder, odorless, tasteless, relative density 3.18, difficultly soluble in water, easily soluble in dilute hydrochloric acid, nitric acid, steady in air.
5. Quality standard:( FCC-V,E 341 (iii)) | Name of index | FCC-V | E 341(iii) |
| Assay (On the ignited basis),≥% | 34.0-40.0(as Ca) | 90 |
| P2O5 Content(on the Anhydrous basis) ,% | -- | 38.5--48.0 |
| Description | White floating crystalline powder | a white, odourless powder which is stable in air |
| Identification | -- | Positive tests for calcium and for phosphate |
| Solubility tests | -- | Practically insoluble in water, insoluble in ethanol soluble in dilute hydrochloric and nitric acid |
| Arsenic ,≤mg/kg | 3 | 3 |
| Fluoride, ≤mg/kg | 75 | 50 |
| Lead,≤mg/kg | 2 | 4 |
| Cadmium, ≤mg/kg | -- | 1 |
| Mercury, ≤mg/kg | -- | 1 |
| Loss on ignition, (After ignition at 800ºC±25ºC, to constant weight) ≤% | 10.0 | 8 |
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