Did You Know There Is an Actual Difference Between PYREX and Pyrex?

There was a lot of fear mongering about the dangerous Chinese Pyrex a few years back.

The Wirecutter did a detailed review and concluded that the differences only matter if you misuse your glass.

Tl:dr, turns out in most markets Pyrex switched off borosilicate glass, which is toxic & expensive to dispose of. And now uses tempered soda-lime glass, which is more succeptible to thermal shock breakage but still pretty ok.

PYREX all caps is supposed to mean the classic borosilicate. Lowercase is likely soda-lime.

Corning owns & licenses Pyrex trademark.