Before diving into the specific features of the Pyrex 508 measuring cup, it’s important to understand the brand’s legacy. Introduced in 1915 by Corning Glass Works, Pyrex was revolutionary in its use of borosilicate glass, a material known for its thermal resistance. This innovation allowed Pyrex products to withstand high temperatures and sudden changes, making them ideal for both oven and stovetop use. Over the years, Pyrex has expanded its product line, but the measuring cup remains one of its most popular offerings.