Qhov laj thawj yog vim li cas cov qhov rooj ntoo hluav taws tuaj yeem tiv thaiv hluav taws thiab cov pa taws yog vim lub luag haujlwm ntawm cov khoom siv refractory siv hauv qhov rooj hluav taws. Lub qhov rooj hluav taws ntoo yog tsim los ntawm cov khoom siv hluav taws kub-retardant ntoo raws li lub qhov rooj thav duab, lub qhov rooj nplooj ncej, lub qhov rooj nplooj vaj huam sib luag, thiab lub qhov rooj nplooj ntawv yog ntim nrog cov khoom tsis muaj tshuaj lom, tsis muaj mob, txuag hluav taws xob thiab ib puag ncig tiv thaiv hluav taws thiab kub- cov ntaub ntawv insulating, thiab yog tsim los ntawm cov khoom siv hluav taws kub-pov thawj thiab cov iav tiv thaiv hluav taws, uas tuaj yeem ua tau raws li qee qhov yuav tsum tau ua. hluav taws kub.