Graphite pas nrig (round) yog Nrog cov ntsiab lus siab carbon thiab tshwj xeeb kub thiab hluav taws xob conductivity, nws tau dhau los ua cov khoom siv tsis raug hauv kev lag luam tsheb thauj mus los, kev tswj hwm hluav taws xob, thiab lwm yam tseem ceeb.