Obere dayameta, sitere na 75mm ruo 225mm, electrode graphite anyị bụ nke emebere ya iji gboo ihe ndị ụlọ ọrụ dị ka mgbaze carbide calcium, mmepụta carborundum, ncha ọcha corundum na-acha ọcha, ọla ndị na-adịghị ahụkebe, na mkpa refractory osisi Ferrosilicon.