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The lids of CorningWare are typically made of Pyrex. Though some early lids were made of Pyroceram, most subsequent covers have been made of borosilicate or tempered soda-lime glass. Unlike the cookware, these lids have a lower tolerance for thermal shock and cannot be used under direct heat.
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): 4.0% boron , 54.0% oxygen , 2.8% sodium , 1.1% aluminum , 37.7% silicon ...
The lids and bands are also shown. The two rightmost jars are quilted. The lids are made of metal with a ring of sealing compound which acts as a gasket against the jar's rim. New sealing compound is only good for about five years from date of manufacture, so older unused lids should be discarded. Lids may not be used more than once. [20]
According to TODAY, vintage Pyrex sets can sell for up to $1,800 online, with single bowls even retailing for a whopping $900. However, not all bowls can fetch such a handsome sum.
After Corning Glass Works introduced Pyrex in 1915, the name became synonymous with borosilicate glass in the English-speaking world (since the 1940s, a sizable portion of glass produced under the Pyrex brand has also been made of soda–lime glass). Borosilicate glass is the name of a glass family with various members tailored to completely ...
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