[Ireallyapart]

weird. I never had a problem with pyrex. Must be something to do with the environment the glass in your specific case is exposed to.

[hinkley]

Pyrex is just tempered glass now. You have to trawl yard sales and antique shops to find the borosylicate version.

[ceejayoz]

There's actually two variants, confusingly differentiated via capitalization.

https://en.wikipedia.org/wiki/Pyrex

> The pyrex (all lowercase) trademark is now used for kitchenware sold in the United States, South America, and Asia. In Europe, Africa, and the Middle East, a variation of the PYREX (all uppercase) trademark is licensed by International Cookware for bakeware that has been made of numerous materials including borosilicate and soda-lime glass, stoneware, metal, plus vitroceramic cookware.