Inhloso: I-Graphite petroleum coke GPC yenziwe nge-coke yekhwalithi ephezulu ye-petroleum. Iwuhlobo lwe-ejenti yekhwalithi ephezulu ye-carburizing, enekhabhoni engaguquki ephezulu, isibabule esiphansi, umlotha ophansi, izinga lokumuncwa okuphezulu nezinye izinzuzo. Ingasetshenziselwa ukukhiqiza izinga okusezingeni eliphezulu steel, cast iron kanye ingxubevange.