Pyrex

A Pyrex measuring cup made around 1980

Pyrex is a brand of very durable glass products. They are used as laboratory glassware and kitchenware.

Pyrex is also used in telescopes because it does not expand much.

Pyrex Media

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  PYREX glassware from Corning Inc.

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  Newspaper ad showing PYREX bakeware from 1922

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  Pyrex casserole dish with the 'Toledo' pattern

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  A clear tempered pyrex soda–lime glass measuring cup produced by Instant Brands (left, differentiated by its different logo and bluish tint), and a clear borosilicate glass PYREX measuring cup produced by Corning (right)

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  Pyrex glass used on the mirror of the Hale Telescope