Calcium Carbide, Graphite Electrode, Cac2 manufacturer / supplier in China, offering Graphitized Petroleum Coke GPC Directly Supplied by The Manufacturer, High-Temperature Purification Quality Assurance, Better Price for Large Quantities., High-Carbon, Low-Sulfur Additive Improves Casting Quality, Reduces Costs, Graphitized Petroleum Coke (GPC) - a High-Carbon and Low-Sulfur Carbon Additive, a Good Choice to Improve The Performance of Castings and so on.