what is pyrex glass made of
TRUE: Pyrex, like all brands of glass bakeware, is subject to breakage due to thermal shock. TRUE: Pyrex glass bakeware was originally made from borosilicate glass and is now made from tempered soda lime glass. UNDETERMINED: Pyrex switched from using borosilicate glass to tempered soda lime glass only after Corning sold the brand to World Kitchen in 1998.