A short explanation of Pyrex glass:
Pyrex glass .
Pyrex is the registered trade name for borosilicate glass made by or on behalf of the Corning company of America. It has low thermal expansion which makes it heat resistant, and good mechanical strength which makes it suitable for many commercial products as well as the famous kitchenware range. It was invented by the research division of Corning Glassworks in the USA around 1908 and by 1915 it was making progress in the domestic kitchenware market, soon to become a world-wide product. The advertisement on the left is an early example offering a 34 piece dinner set in Corning's Pyrex glass. Corning offered a contract to make Pyrex under license to several UK glassworks, but only Greeners in the North East of England took up the option in 1921. At that time Greeners changed their name to James A Jobling and embarked on a new era of producing Pyrex kithenware and (quite separately) art deco pressed glass (see our page on Joblings glass).
Pyrex was also made under license in Australia, at the Crown Crystal Glassworks. Each company marked their Pyrex glassware with their own trademark, and to some extent developed separate product lines from the others.
There are some very helpful books on Pyrex glass.
Each of the books shown below has some excellent information about Pyrex. Click on any book cover to read more about that book.