Abstract
Field Covered.—A typical porcelain glaze formula: was used. The RO was held constant, the Al2O3 was varied between 0.8 and 1.6 equivalents, and the SiO2 between 6 and 16 equivalents. Firing Test.— the galzes were applied to green porcelain dises and fired to cone 173/4 down, and cones, 18, 19, and 20 down in commercial kilns. Representation of Results.—The glazes are plotted according to batch weights and empirical formula. The diagrams show the location of the best glazes at each temperature better than would statements of limits. Best Compositions.—Under conditions similar to those used, the best glazes for temperatures between cones 17 and 20 have the following range of composition:
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