Pyrex Storage Containers

Pyrex is a brand name for glassware, introduced by Corning Incorporated in 1915. According to Carroll Gantz, Dr. Jesse Littleton of Corning discovered its cooking potential by presenting his wife with a makeshift casserole made from a cut down Nonex (a low expansion glass developed in 1908 by Dr. Eugene Sullivan) battery jar. Corning then removed the lead that was present at the time, and Pyrex was born.
Originally, Pyrex was made from thermal shock resistant borosilicate glass. In 1998, Corning sold its consumer products division which subsequently adopted the name World Kitchen. Pyrex kitchen glassware manufactured and licensed for sale in the United States is now made of tempered soda lime glass at the World Kitchen facility in Charleroi, Pennsylvania. Pyrex products for the European Union continue to be made of borosilicate glass in France. Pyrex laboratory glassware is also still made of borosilicate glass.