... Petroleum Coke, graphitized petroleum, calcined petroleum coke 1. Low density 2. High carbon content Graphitized petroleum coke, Calcined petroleum ... the following features: (1) It is characterized by less density, Loose texture and porous. (2) High carbon, a ... effect. (4)Friction material used petroleum coke can Lower density, Improve product porosity and compression performance. Thereby improving ...