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Is there a difference between PYREX and Pyrex labels on cookware? Here's what we know

You may have heard that uppercase PYREX and lowercase pyrex labels on cookware indicate what materials the items are made of. Discover if this is true.
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Pyrex Isn't Just Regular Glass: Here's What It's Made Of

Baked lasagna is Pyrex casserole dishes on top of a stove. - Sal61/Getty Images Pyrex changed home cooking forever when it was developed in the early 20th century. The glass material used in the ...