Note on the Rate of Melting and Refining of Alkali–Lime–Silica Glasses containing both Soda and Potash
JSGT 1934 V18 T286-T289
Experiments based on a glass of composition 75% SiO2, 10CaO, 15(Na2O+K2O) indicate that the glasses containing a mixture of the two alkaline oxides melt more quickly than those in which either alkali alone is present. The rate of refining of the mixed alkali glasses, however, is not quicker than that of the glass containing soda only. The glass containing potash only required in covered pots a temperature approaching 1500° for its satisfactory melting and certainly a temperature of 1500° for satisfactory' refining. The glasses containing a mixture of the alkalis work better than those containing either alkali alone, the best of the five glasses tested in this respect being that in which equal proportions by weight of soda and potash were present.
W. Maskill & W. E. S. Turner
