Isifudumezi se-coil sase-Spring senziwe nge-nickel chrome yokumelana nocingo olubekwe ngaphakathi kwityhubhu yentsimbi ye-nickel ezaliswe ngumgubo we-MgO. Isifudumezi se-coil yaseNtwasahlobo sikwabizwa ngokuba zizifudumezi eziphezulu ze-tubular okanye izifudumezi zentambo. Ukufudumala kwentwasahlobo kunokuveliswa kunye okanye ngaphandle kokwakhiwa kwe-thermocouples. I-heater coil yasentwasahlobo isetyenziswa ngokubanzi kubunjineli bokufudumeza, ukungunda, ishishini leplastiki, kubandakanya oomatshini bokudlulisa, inkqubo yokuphosa, ukuwelda, inkqubo yonyango lobushushu kunye namanye amashishini amaninzi kunye namasimi.