Products by our R & D Carbon agent. With carbon, sulfur, low nitrogen and harmful impurities and less good features, the product is casting industry to improve technology, improve the quality of hot metal to a new material, as in recent years the Mexican foundry smelting ball iron castings, gray iron castings, low nitrogen steel, steel cord, bead wire of high strength steel and other production preferred by charring agent, but also widely used in brake pads and friction materials.