Old Bridge Chemicals, Madison Industries and Madison Chemicals were established in 1962 and are major suppliers of copper and ... zinc compounds and solutions, serving a variety of chemical-related industries and focusing on a select number of products. Old Bridge concentrates on copper chemicals, Madison Industries on zinc chemicals and Madison Chemicals on USP and FCC grades for food and pharmaceutical applications. We are the largest manufacturer of copper sulfate and copper carbonate in the United States and are a major supplier of zinc sulfate, zinc chloride and other chemical compounds containing copper and zinc. Our basic strategy is to focus our expertise on a handful of products while producing a variety of grades. This allows us to provide the excellent service and consistent quality our customers demand. read more