calcium bis(metaphosphate);calcium dimetaphosphate (ca(po3)2);calcium phosphate (ca(po3)2);metaphosphoric acid (hpo3), calcium salt;Metaphosphoric acid, calcium salt;Metaphosphoric acid,calcium salt;Bis(phosphooxy)calcium;Calcium metaphosphate, with A fluorine content of less than 0,005 % by weight on the dry anhydrous product