I-high-purity graphitized petroleum coke(GPC) yenziwe kumgangatho ophezulu wepetroleum coke phantsi kobushushu obuyi-2,500-3,500°C. Njengomgangatho ophezulu wekhabhoni ococekileyo, uneempawu eziphezulu zekhabhoni ezisisigxina, i-sulphur ephantsi, i-ash ephantsi, i-porosity ephantsi njl kunye nerabha njengesongezo.