Bakin karfe farantin yana da m surface, high plasticity, tauri da kuma inji ƙarfi, kuma yana da resistant zuwa lalata ta acid, alkaline gas, mafita da sauran kafofin watsa labarai.Karfe ne da ba ya yin tsatsa cikin sauki, amma ba shi da tsatsa kwata-kwata.Bakin karfe yana nufin farantin karfe mai juriya da lalata ta hanyoyin sadarwa masu rauni kamar yanayi, tururi da ruwa, yayin da farantin karfe mai juriya na acid yana nufin farantin karfe wanda ke jure lalata ta hanyar sinadarai masu lalata kamar acid, alkali. da gishiri.