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Borosilicate Glass is Much More Resistant to Thermal Shock. It's for this reason that all high quality cookware is made from borosilicate glass. This has the round 1950’-1960’s PYREX logo on the bottom.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.