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Soda lime glass, not borosilicate
on September 30, 2015
Confirmed from Pyrex (World Kitchen) that this is indeed soda lime glass, not borosilicate like the old Pyrex. Soda lime glass has been in the news because it can explode when going from one temperature extreme to the other. My research says that even taking a hot bowl from the microwave and setting it on a counter can be enough to set it off. Wanted to return it, but would have to pay shipping back so after spending almost $15 would only be refunded about $5. So, we'll keep it and just not use it for heating. Bummer, and all in the name of worshipping the bottom line over providing good product.