Cov lus qhia tseem ceeb ntawm graphite roj coke yog raws li nram no: cov dej noo hauv qab 0.5%, sulfur hauv qab 0.05%, phosphorus ntawm 0.04-0.01, hydrogen nitrogen hauv qab 100% ppm. Cov pa roj carbon ntau ntawm cov khoom me me yog qhov nruab nrab, porosity yuav loj dua, qhov ceev nqus tau sai, thiab nws cov tshuaj lom neeg yog qhov huv, qhov nrawm nqus tau yuav siab. Cov khoom me me 0-5 hli, 1-5 hli, 0-10 hli, thiab lwm yam, tuaj yeem ua tiav raws li cov neeg siv khoom xav tau.
