Thee roj flammable txaus muaj xws li carbon monoxide thiab hydrogen, Lub tom kawg tsis nyob rau hauv cov roj explosive qeb ntawm hoob kawm IIC. Txawv ntawm tej nkev, Rau uas IIBT4 tawg-proof hluav taws xob khoom suffices, Thee roj necessitates siv IICT4.
Xav paub ntxiv txog kev ruaj ntseg ntxiv, kev ntsuam xyuas kis los yog yam tsawg kawg yog ignition tam sim no thwmsim yog advisable.