In the early 1910s Corning Glass Works began looking for new products to feature its borosilicate glass, Nonex. At the suggestion of a Corning scientist’s wife, the company began investigating Nonex for bakeware. After removing lead from Nonex to make the glass safe for cooking, they named the new formula "Pyrex"—"Py" for the pie plate, the first Pyrex product.
Home economists and everyday cooks appreciated the new glass cookware for some of the same reasons scientists had long valued laboratory glass. It was durable and easy to clean thoroughly, and it allowed observation of a meal as it cooked.