Borosilicate glass is a type of glass with the main glass-forming constituents silica and boron trioxide. Borosilicate glasses are known for having very low coefficients of thermal expansion (~3 × 10−6 /°C at 20 °C), making them resistant to thermal shock, more so than any other common glass. Such glass is less subject to thermal stress and i...
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http://en.wikipedia.org/wiki/Borosilicate_glass
a glass containing 5 percent or more of BO, highly resistant to heat and shock, used esp. in making cookware and chemical glassware.
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https://www.infoplease.com/dictionary/borosilicate-glass
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