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Freezer-to-oven is the worst offender. Even vintage borosilicate Pyrex, tougher than today’s tempered soda-lime versions, can only take so much. Let frozen meals thaw fully, or move them to a different pan before baking. In the end, the rule is simple: respect the temperature change. Treat Pyrex like durable glass, not indestructible armor, and it will quietly outlast trends, gadgets, and maybe even you.