The Pyrex Glass Controversy That Won’t Die

Corning licensed the Pyrex brand to a company called World Kitchen—now known as Corelle Brands—in 1998, and by nearly all accounts, all Pyrex cookware sold in the United States after that year has been made of tempered soda-lime glass. Resistance to thermal shock is part of why Pyrex became so popular for cookware; you could move a hot glass pan into a cool spot without worrying about it cracking or shattering. However, when Consumer Reports conducted an investigation into the issue of shattering cookware in 2010, a Corning spokesperson told the magazine that several of its factories were producing Pyrex out of both borosilicate and soda-lime glass up until Corning licensed the brand to World Kitchen in 1998.

Source: gizmodo.com