I-calcined needle coke ihluke kakhulu kune-sponge coke ngesakhiwo sayo, inobuningi obukhulu, ubumsulwa obuphezulu, amandla aphezulu, okuqukethwe kwe-sulfur okuphansi, amandla aphansi okushisa, i-coefficient yokwanda kokushisa okuphansi kanye nokumelana okuhle nokushaqeka kokushisa.
