I-graphite petroleum coke(GPC), njenge-carbon raiser, yinxalenye ebalulekileyo kwishishini lokwenza intsimbi.Isetyenziswe ngokuyinhloko njenge-carbon add-on ngexesha lokuvelisa isinyithi ukwandisa umxholo wekhabhoni, ukunciphisa ukungcola, kunye nokuphucula umgangatho wonke wensimbi.