Idi: Graphite petroleum coke GPC jẹ ti koki epo epo ti o ga julọ. O jẹ iru oluranlowo carburizing didara ti o ga, pẹlu erogba ti o wa titi giga, sulfur kekere, eeru kekere, oṣuwọn gbigba giga ati awọn anfani miiran. Le ṣee lo lati ṣe agbejade irin to gaju, irin simẹnti ati alloy.
