Industrial Borate Glasses
One of the first factory produced boro-silicate glasses was made by Maës in Clichy, France around 1850. It was a glass one would call today a “boro-silicate crown” and its composition, according to an analysis reported by E. Zschimmer , was 56% silica, 7% boric acid, 17% potassia, 2% calcia, 14% zinc oxide, 4% lead oxide. Articles made of this glass included hollow ware and most likely optical elements. Although there appears to be no direct connection between this early boro-silicate glass and today’s wide variety of boron containing glasses, optical elements and hollow ware for special applications are still articles produced commonly from them.
KeywordsGlass Composition Borate Glass Boron Oxide Optical Glass Chromatic Aberration
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