Ke kumu: Hana ʻia ʻo Graphite petroleum coke GPC i ka coke petroleum kiʻekiʻe. ʻO ia keʻano o ka carburizing agent kiʻekiʻe, me ke kalapona paʻa kiʻekiʻe, ka sulfur haʻahaʻa, ka lehu haʻahaʻa, ka nui absorption kiʻekiʻe a me nā pono'ē aʻe. Hiki ke hoʻohana ʻia e hana i ke kila kiʻekiʻe, ka hao a me ka hao.
