| Synonyms | Pentapotassium tripolyphosphate |
| Potassium triphosphate |
| Potassium tripolyphosphate |
| Definition | |
| Chemical name | Pentapotassium triphosphate |
| Pentapotassium tripolyphosphate |
| Einecs | 237-574-9 |
| Chemical formula | K5O10P3 |
| Molecular weight | 448,42 |
| Assay | Content not less than 85 % on the anhydrous basis |
| P2O5 content | Not less than 46,5 % and not more than 48 % |
| Description | White, very hygroscopic powder or granules |
| Identification | |
A.Solubility | Very soluble in water |
B.Positive tests for potassium and for phosphate | |
C.pH of a 1 % solution | Between 9,2 and 10,5 |
| Purity | |
| Loss on ignition | Not more than 0,4 % (after drying at 105 oC, four hours, followed by ignition at 550 oC, 30 minutes) |
| Water-insoluble matter | Not more than 2 % |
| Fluoride | Not more than 10 mg/kg (expressed as fluorine) |
| Arsenic | Not more than 3 mg/kg |
| Cadmium | Not more than 1 mg/kg |
| Lead | Not more than 4 mg/kg |
| Mercury | Not more than 1 mg/kg |