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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.
Though the pattern isn’t as rare, the condition and completeness of a set can boost its value, with well-kept sets selling for around $300. 6. Early American Cinderella Bowls (1962-1971)
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 ...
This keeps the lid at a lower temperature than the pot bottom. Further, little notches on the inside of the lid allow the moisture to collect and drop back into the food during the cooking. Although the Doufeu (literally, "gentlefire") can be used in an oven (without the ice, as a casserole pan), it is chiefly designed for stove top use.