Ntoo qhov rooj hluav taws yog ib hom hluav taws kub qhov rooj, kuj yog cov khoom siv hluav taws xob, cov khoom siv ntoo. Tab sis cov ntoo siv los ntawm lub qhov rooj tua hluav taws tau ua tiav tshwj xeeb, thiab cov ntoo tau raug kho hluav taws, uas yog cov khoom siv refractory, thiab tuaj yeem ua tau raws li cov xwm txheej ntawm cov rwb thaiv tsev kub thiab hluav taws kub.

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