Bakin karfe dumama sandar lantarki (lantarki dumama tube) ne karfe tube a matsayin harsashi, kuma karkace lantarki dumama gami wayoyi (nickel-chromium, baƙin ƙarfe-chromium gami) an uniformly rarraba tare da tsakiyar axis na tube. An cika gibin da aka haɗa tare da foda na magnesium oxide tare da ingantaccen rufi da haɓakar thermal. Dukkanin ƙarshen an rufe su da gel silica ko yumbu. Wannan karfe sulke lantarki dumama kashi za a iya yadu amfani da dumama ruwa, mai, iska, nitrate bayani, acid bayani, alkali bayani da kuma low narkewa batu karafa (aluminum, tutiya, tin, babbitt gami) , Yana da abũbuwan amfãni daga mai kyau dumama yadda ya dace. , uniform zafin jiki, high zafin jiki juriya, lalata juriya, da kuma mai kyau aminci yi.