Iron ore
In cast iron sulfur promotes the formation of white iron. As little as 0.5% can counteract the effects of slow cooling and a high silicon content . White cast iron is more brittle, but also harder. It is generally avoided, because it is difficult to work, except in China where high sulfur cast iron, some as high as 0.57%, made with coal and coke, was used to make bells and chimes . According to , good foundry iron should have less than 0.15% sulfur. In the rest of the world a high sulfur cast iron can be used for making castings, but will make poor wrought iron.
List of cast-iron cookware manufacturers
Milo is a Los Angeles based company that manufactures kitchen essentials. They launched in 2018 with a cast iron enameled Dutch Oven. They sell exclusively online from their website and have a lifetime warranty on their products.
Field Skillets are manufactured in Wisconsin and Indiana and the focus is on creating lighter weight cast iron. The pans have a smooth finish.
Several companies import cast-iron cookware of Chinese manufacture and market these products in America. Known American marketers of Chinese cast-iron cooking equipment include Bayou Classic, Camp Chef, Coleman, Old Mountain and Texsport.