Calcined Petroleum Coke. graphitized petroleum coke. carbon raiser/additive. Calcined Petroleum Coke (CPC) is obtained by heating Raw Petroleum Coke (RPC) at temperatures as high as 1400°C. RPC is a by-product of the oil refining process. CPC is used in the Aluminum, Graphite Electrode, Steel, Titanium Dioxide and other carbon consuming industries.