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Pyrex Vs PYREX: The Major Differences, Explained By Bobby Lewis Sept. 28, 2025 2:39 pm EST

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You may have grown up hearing about the legendary strength of PYREX cookware, which reportedly had enough thermal shock resistance to go straight from the freezer into a hot oven. But if you tried the freezer-to-oven pyrex trick yourself only for the glass to shatter, then you unfortunately discovered one of the main differences between PYREX and pyrex.

PYREX (stylized with uppercase letters) is the name brand for Corning's line of lab-made borosilicate glass, known for its excellent resistance to rapid temperature changes that occur frequently in lab work. It's also resistant to impacts and chemical reactions. On the other hand,

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