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Borosilicate glass is a particular type of glass, better known under the brand names Pyrex and Kimax. Corning Glass Works developed the glass in 1924.
In addition to the quartz, sodium carbonate, and calcium carbonate traditionally used in glassmaking, boron is used in the manufacture of borosilicate glass. Though somewhat more difficult to make than traditional glass due to its higher melting point, its superior durability and heat resistance finds excellent use in chemical laboratory equipment, as a beaker or flask made of the glass may be heated without the need of excessive insulation.
Borosilicate glass also has a very low thermal expansion coefficient, making it a popular material for objects like [[telescope] mirrors, where it is essential to have very little deviation in shape.
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