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Borosilicate Glass is a specialized form of glass that uses boric acid as a component in its fabrication. The result of the addition of the element boron is a type of glass that is very resistant to thermal shock and exhibits a much lower coefficient of thermal expansion than that of common silicate glass. In this article, a review of borosilicate glass will be presented, including its development, properties, and uses.


Development of Borosilicate Glass

Back in 1882, a German chemist named Otto Schott was interested in experimenting with ways to create glass that had the ability to withstand sudden changes in temperature or exposure to uneven temperatures without shattering. In that year, he made the discovery that ushered in the creation of the Borosilicate Glass Tube. Schott discovered that the addition of the element Boron to the glass fabrication process resulted in a heat-resistant form of glass.

Later work by chemists W.C. Taylor and Eugene Sullivan at Corning Glass refined the efforts of Otto Schott and expanded the temperature resistant properties of borosilicate glass. As a result of these innovations, customized glass fabrication grew, where there is now over a million different formulations of glass that can be customized for specific product needs by enhancing the desired physical and mechanical properties of glass.

Perhaps the most well-known application for borosilicate glass grew from further research at Corning Glass. After joining the company in 1914, physicist Jesse Littleton was given the task of testing and evaluating the physical properties of the newly created glass formulation. After his wife’s ceramic casserole dish accidentally broke, she suggested that perhaps this newly developed heat resistant glass might prove to be a useful product for baking. After she tested the notion by baking a cake in a sample glass container that Littleton had brought home, a new use for Borosilicate Glass Rod was born – glass cookware. Corning Glass introduced a line of products known as Pyrex®[1], which was for many years of its manufacturing run produced using borosilicate glass.

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