American Cookware built-up to last a Lifetime! Granite Ware has been part of American kitchens for nearly 150 years. Granite Ware is made by fusing porcelain to a steel core at 1500°F. The steel core provides strength and even heat distribution while the porcelain surface is inert and naturally non-stick. Porcelain is all-natural and will not alter the color, taste, or nutritional value of your food. There is no PTFE, PFOA, or other unhealthy chemicals in Granite Ware.