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Modern Pyrex is ordinary glass, mostly, and sometimes strengthened glass.

Old Pyrex was borosilicate glass.



Pyrex the brand switched to soda lime glass in North America, but you can still find borosilicate glass kitchenware from different vendors.


> Modern Pyrex ... Old Pyrex

Most conveniently differentiated by the branding on the product.

All caps "PYREX" is the classic (high quality) borosilicate stuff.

Titlecased "Pyrex" is the modern ordinary glass stuff.




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