Ujeeddo: Graphite petroleum coke GPC waxa uu ka samaysan yahay kook shidaal oo tayo sare leh. Waa nooc ka mid ah wakiilka carburizing tayo sare leh, oo leh kaarboon go'an oo sarreeya, baaruud hooseeya, dambas hooseeya, heerka nuugista sare iyo faa'iidooyinka kale. Waxaa loo isticmaali karaa in lagu soo saaro bir tayo sare leh, bir shub ah iyo daawaha.
