Lub qhov rooj steel fireproof yog tsim los ntawm steel ncej thiab steel qhov rooj nplooj kom ntseeg tau tias nws tsis yooj yim rau kev cuam tshuam, deformed thiab puas los ntawm sab nraud quab yuam, thiab tuaj yeem siv tau ntev ntev yam tsis muaj kev hloov. Cov txheej txheem kho saum npoo ntawm steel fireproof qhov rooj nplooj yog hmoov txau lossis PVC txheej, uas yog txheej txheem kev tiv thaiv ib puag ncig.