Graphite petroleum coke(GPC), sida kaarboon-qaade ahaan, waa qayb muhiim ah oo ka mid ah warshadaha samaynta birta.Waxa ugu horrayn loo isticmaalaa kaarboon-kordhin inta lagu jiro wax-soo-saarka birta si loo kordhiyo maadada kaarboonka, loo yareeyo wasakhda, loona wanaajiyo tayada guud ee birta.