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
Borough Furnace is based in Syracuse, NY. All of their products are designed by John Truex and produced in their sustainable facility, powered by renewables. Borough Furnace was also the first cookware company to season their products with flax seed oil and to advertise their usage of recycled materials.FINEX is based in Portland, Oregon and manufactures cast-iron cookware in the US. FINEX Cast Iron Cookware Company is a small team dedicated to making heirloom quality cast-iron cookware in the US.Nest Homeware is a small company based in Providence, RI, specializing in beautifully designed cast iron cookware. Nest is managed by its founder and principal designer, Matt Cavallaro.TAKU manufactures cast-iron cookware (pan, pots, teapots...) in Taichung, Taiwan. TAKU also uses local artists to create unique cast-iron cookware.Stargazer Cast Iron is based in Allentown, Pennsylvania, and produces cookware in the US. They are an e-commerce retailer, and their products can only be purchased direct via the company's website. Stargazer Cast Iron's cookware is available bare or seasoned.Marquette Castings designs investment cast-iron cookware in Royal Oak, Michigan, and manufactures in the US and China.