| http://www.w3.org/ns/prov#value | - Preferably the amount of the alkaline earth metal oxide, carbonate or hydroxide used is adjusted so as to give an amount of alkaline earth atoms in reactive form which is 0.49 to 4 times, especially 0.6 to 2 times, on a molar basis, the stoichiometry of fluoride ions contained in the hydrogen fluoride and/or hydrofluoric acid amine salt form
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