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A PYREX measuring cup manufactured c. 1980, featuring graduations in both U.S. and metric units. Pyrex (trademarked as PYREX and pyrex) is a brand introduced by Corning Inc. in 1915, initially for a line of clear, low-thermal-expansion borosilicate glass used for laboratory glassware and kitchenware.
Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass.
Eventually, Pyrex began using tempered soda-lime opal glass to make its dishes instead of the much-stronger borosilicate glass, a change which made original Pyrex dishes even more valuable and ...
Corelle, a brand name for break-resistant glass dishware also originally created by Corning Glass Works, has offered matching designs to many CorningWare patterns. [6] Care must be made to distinguish between Corning Ware cookware and tableware marketed under the Corelle and Pyrex brand names, as the thermal properties of the products are quite ...
Pyrex & Corningware. ... Crystal will have a clear ring to it, while glass will make more of a thud sound. Crystal, in the light, will also show off a little rainbow-y prism, and is also a much ...
Online shoppers who bought certain Pyrex measuring cups in recent years may be eligible for a refund. The Federal Trade Commission announced it is issuing a total of $88,000 in refunds to ...