Wamba wodula waya amapunduka chifukwa cha kufewa kwake pamene ntchito, ndipo mbali yake kutalika kumakhala ofewa, zomwe zimakhudza kulondola ndi liwiro la kudula ndondomeko.Waya wa iron-chromium-aluminium ndi wovuta, koma wonyezimira komanso wosavuta kuthyoka.Waya waku Germany wodulira woyambirira sadzakhala wofewa, sudzapunduka pa kutentha kwambiri, ndipo ndi wokhazikika.Ndiwo waya wodula bwino kwambiri.
Waya wodula wotumizidwa kuchokera ku Germany ali ndi kukana kwa okosijeni pamtunda komanso kulimba kwa kutentha kwambiri.The pazipita amakokedwe mphamvu ya wamba zoweta kudula waya ndi 780, ndi kunja kudula waya akhoza kufika 1800, amene ali bwino processing ntchito.Zotsatira zabwino kwambiri zodulira zimatha kutheka mwa kusintha kutentha ndi liwiro la kudula, ndipo mtundu ndi kachulukidwe kazinthuzo zidzakhudza liwiro lodula.