
I have confirmed with the manufacturer that the Pyrex sold in the US is no longer borosilicate but soda lime. like that . Read the instructions, it's not the Pyrex you knew when Corning made it. see link: Wikipedia topic Pyrex If you understand this and are not exposed to direct temperature changes, then this product is excellent. It takes a lot to break them, but it can be done. In other words, when you switch from the freezer to the oven or microwave. Make a stop in the water first to reduce heat stroke.

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