Pyrex is a brand name of borosilicate glass, which was introduced by Corning Glass Works in 1924. Though borosilicates had been produced before, the name Pyrex is has since become a synonym for the material. Pyrex is created by adding boron to the traditional glassmaker's combination of silicate sand, soda, and ground lime. Pyrex more resistant to heat and is also less dense than ordinary glass.

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