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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 ...
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related to: ebay pyrex 8100 lid cover pattern guide book