I-coke yepetroleum ecocekileyo kakhulu eyenziwe nge-coke yepetroleum esemgangathweni ophezulu phantsi kobushushu obuyi-2,500-3,500℃. Njengezinto zekhabhoni ezicocekileyo kakhulu, ineempawu zomxholo wekhabhoni ozinzileyo ophezulu, isalfure ephantsi, uthuthu oluphantsi, ukubola okuphantsi njl.njl.