Corning Ware, also written CorningWare, was originally a brand name for a unique glass-ceramic (Pyroceram) cookware resistant to thermal shock. It was first introduced in 1958 by Corning Glass Works (later Corning Inc.) in the United States. The brand was later spun off with the sale of the Corning Consumer Products Company subsidiary (now known as Corelle Brands of Rosemont, Illinois). Glass-ceramic based Corning Ware can be taken from the refrigerator or freezer and used directly on the stovetop, in an oven or microwave, under a broiler, for table / serving use, and when ready for cleaning put directly into a dishwasher. CorningWare is sold worldwide, and it is popular in North America, Asia, and Australia.
In 1953 S. Donald Stookey of the Corning Research and Development Division discovered Pyroceram, a white glass-ceramic material capable of withstanding a thermal shock of up to 450 K (840 °F), by accident. He was working with photosensitive glass and placed a piece into a furnace planning on heating it to 600 degrees Fahrenheit. When he checked on his sample, the furnace was at 900 degrees and the glass had turned milky white. He reached into the furnace with tongs to discard the sample, and it slipped and hit the floor without shattering.
Originally manufactured primarily in the USA, production of Pyroceram-based Corning Ware ceased in the States with the closure of the Martinsburg, West Virginia plant. While production continued in France, the product was temporarily unavailable in the USA and the brand was relaunched as a line of stoneware-based bakeware in 2001.
Corelle Brands' (then known as "World Kitchen") 2001 annual report indicated that the stovetop and dinnerware product lines were halted at the end of the century "as part of a program designed to reduce costs through the elimination of under-utilized capacity, unprofitable product lines, and increased utilization of the remaining facilities."
In December 2008, the Pyroceram-based line of CorningWare was reintroduced in the USA as CorningWare StoveTop. It continues to be manufactured by Keraglass/Eurokera (a partnership between Corning and Saint-Gobain specializing in vitroceramics for cooktop panels and equipment for laboratories) in Bagneaux-sur-Loing, France. This is one of the only factories in the world still manufacturing Pyroceram-based cookware. One of the benefits of modern Pyroceram production is Keraglass/Eurokera's ability to manufacture cookware without the use of arsenic.
As of early 2022, sales Pyroceram-based CorningWare were again discontinued in the USA but it continues to be sold in other regions of the world.
Corning Ware's range/oven-to-table cookware first featured the 'Blue Cornflower' pattern designed by Joseph Baum, an artist at the Charles Brunelle Advertising Agency in Hartford, Connecticut. It became the trademark of Corning consumer products for three decades. Beyond the Blue Cornflower pattern, dozens of additional styles have been offered over the years such as 'Floral Bouquet', 'Spice O' Life', 'French White', and "Shadow Iris".
Currently, Pyroceram-based Corning Ware is popular in the Asia–Pacific region. Additional patterns have been created specifically for this market, including Bliss, Blue Elegance, Cool Pansies, Country Rose, Dainty Flora, Dandy Blossoms, Elegant City, European Herbs, Herb Country, Lilyville, Lush, Petite Trio, Plum, Salad Seasons and Warm Pansies among others.
The lids of CorningWare are typically made of Pyrex. Though some early lids were made of Pyroceram, most subsequent covers have been made of borosilicate or tempered soda-lime glass. Unlike the cookware, these lids have a lower tolerance for thermal shock and cannot be used under direct heat.
More than 750 million pieces of Corning Ware's range/oven-to-table service have been manufactured since its inception. A partial product list includes: browning skillets, cake pans, casserole dishes, coffee pots (percolator,drip), dinner service (Centura by Corning), Dutch ovens, frying pans, Grab-It bowls, loaf pans, percolators, pie plates, ramekins, restaurant ware (Pyroceram), roasters, sauce pans, skillets, soufflé dishes, and teapots.
Corelle Brands sells similar looking products under the CorningWare brand name that are made of glazed stoneware, rather than Pyroceram. The packaging for this type of CorningWare bakeware specifically that they are not for stovetop use.
Visions, a brand of transparent stove top cookware originally created by Corning France and still being produced today,[when?] is made of a transparent version of Pyroceram. It features thermal traits very similar to Corning Ware plus improved resistance to staining and the detrimental effects of acids and detergents.
Corelle, a brand name for break-resistant glass dishware also originally created by Corning Glass Works, has offered matching designs to many Corning Ware patterns. Care must be made to distinguish between Corning Ware cookware and tableware marketed under the Corelle and Pyrex brand names, as the thermal properties of the products are quite different.
Arc International, France, sells cookware that is equivalent to Corning Ware under various brand names including Arcoflam, Luminarc, and Arcoroc. Their Octime line of glass-ceramic products was rebadged for Princess House and sold as Nouveau cookware in the USA and other select regions.
When I came back, the temperature gauge was stuck on 900 degrees, and I thought I had ruined the furnace ... When I opened the door to the furnace, I saw the glass was intact and had turned a milky white. I grabbed some tongs to get it out as fast as I could, but the glass slipped out of the tongs and fell to the floor. The thing bounced and didn’t break. It sounded like steel hitting the floor. ...
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