Embed Notice

@sickburnbro @Shannon14850 I looked into this and the story I found was that for cookware Corning generally switched from borosilicate to soda–lime glass, but did a really good job of manufacturing it (and now having bought some more old Pyrex and looked at all of it closely I can see careful design too).

When the Pyrex brand was sold in 1998 the company that got it for the US of course dropped the careful manufacturing.