Dating pyrex

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What Is Pyrex?

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See all 4 reviews. Sullivan had learned about Schott's borosilicate glass as a doctoral student in Leipzig , Germany.

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Jesse Littleton of Corning discovered the cooking potential of borosilicate glass by giving his wife Bessie Littleton a casserole dish made from a cut-down Nonex battery jar. Corning removed the lead from Nonex and developed it as a consumer product. A Corning executive gave the following account of the etymology of the name "Pyrex": The word PYREX is probably a purely arbitrary word which was devised in as a trade-mark for products manufactured and sold by Corning Glass Works.

While some people have thought that it was made up from the Greek pyr and the Latin rex we have always taken the position that no graduate of Harvard would be guilty of such a classical hybrid. Actually, we had a number of prior trade-marks ending in the letters ex.

One of the first commercial products to be sold under the new mark was a pie plate and in the interests of euphonism the letter r was inserted between pie and ex and the whole thing condensed to PYREX. In the late s and s, Corning also introduced other products under the Pyrex brand, including opaque tempered soda-lime glass for bowls and bakeware, and a line of Pyrex Flameware for stovetop use; this borosilicate glass had a bluish tint caused by the addition of alumino-sulfate.

He redesigned the Pyrex ovenware and Flameware. Corning divested itself of the Corning Consumer Products Company now known as Corelle Brands in and production of consumer Pyrex products went with it. Its previous licensing of the name to Newell Cookware Europe remained in effect. Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass. According to the National Institute of Standards and Technology , borosilicate Pyrex is composed of as percentage of weight: According to glass supplier Pulles and Hannique, borosilicate Pyrex is made of Corning glass and is equivalent in formulation to Schott Glass glass sold under the "Duran" brand name.

Beginning in the s, production of Pyrex glass cookware manufactured by Corning and later Corelle Brands, after the consumer division was spun off and renamed was shifted to tempered soda-lime glass, like their opal bakeware. Also, it is cheaper to produce and more environmentally friendly.

However, its thermal shock resistance is lower than borosilicate's, leading to potential breakage from heat stress if used contrary to recommendations. European Pyrex is still made from borosilicate. The differences between Pyrex-branded glass products has also led to urban legends and the concern of safety issues—in , the Consumer Product Safety Commission reported it had received 66 complaints by users reporting that their Pyrex glassware had shattered over the prior ten years yet concluded that Pyrex glass bakeware does not present a safety concern.

The consumer affairs magazine Consumer Reports investigated the issue and released test results, in January , confirming that borosilicate glass bakeware was less susceptible to thermal shock breakage than tempered soda lime bakeware. However, they admitted their testing conditions were "contrary to instructions" provided by the manufacturer.

Because of its low expansion characteristics, Pyrex borosilicate glass is often the material of choice for reflective optics in astronomy applications. In , George Ellery Hale approached Corning with the challenge of fabricating the inch 5. The mirror was cast by Corning during — out of borosilicate glass.

The first blank now resides in the Corning Museum of Glass. From Wikipedia, the free encyclopedia. For the programming language, see Pyrex programming language. Archived from the original on January 4, Retrieved 5 June Archived from the original on 2 October