Cov roj av coke graphitized uas muaj purity siab yog ua los ntawm cov roj av coke zoo nyob rau hauv qhov kub ntawm 2,500-3,500 ℃. Ua cov khoom siv carbon uas muaj purity siab, nws muaj cov yam ntxwv ntawm cov pa roj carbon ruaj khov siab, cov sulfur tsawg, cov tshauv tsawg, cov porosity tsawg thiab lwm yam.
