IDENTITY AND AMOUNTS OF FLUORIDE CRYSTALS PRESENT IN ENAMELS*

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Abstract
A group of enamels containing fluorspar, cryolite, and sodium silicofluoride, added in various proportions, was prepared under carefully controlled conditions, including smelting in an electric resistor furnace. The only mill additions were clay and water; no opacifier was used. X‐ray diffraction patterns were made of all the fired enamels. Recrystallized cryolite (Na3AlF6), fluorite (CaF2), and villiaumite (NaF) were found in the fired enamels. Cryolite, the most important opacifier used in the enamels studied, was found to recrystallize whenever enough cryolite or sodium silicofluoride was added in the raw batch. The accuracy of the X‐ray method was found to be ±1/2% for villiaumite or fluorite and ± 1% for cryolite. A calculation of the unaccounted‐for fluorine showed it to be fairly constant at about 2.8%.

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