I-coke ye-petroleum ene-calcined idla ngokuba nomxholo ophezulu wekhabhoni oqala kwi-98% ukuya kwi-99.5%. Lo mxholo uphezulu wekhabhoni uqinisekisa ukusebenza kakuhle kwizicelo ezinxulumene nekhabhoni, njengokuvelisa i-anode kunye nokwenza intsimbi.