The Influence of Boric Oxide on the Rate of Melting and on the Thermal Expansion and Resistance to Weathering of Soda–Lime–Silica Sheet Glasses

JSGT 1934 V18 T013-T018

The influence on the melting rate, thermal expansion, and resistance to water of the progressive addition of small amounts of boric oxide up to a maximum of 1·5% has been determined in reference to soda–lime–(magnesia)–silica glasses of the type employed for sheet glass. Melting determinations on some fifty glasses show that the rate of melting is definitely accelerated. Based on the examination of twenty glasses it is found that the thermal expansion is, in general, slightly reduced and therefore improved. The improvement in resistance to water is either slight or inappreciable.

Violet Dimbleby, Michael Parkin, Eric Seddon, W. E. S. Turner & Francis Winks