Zida: Waya wa Nichrome Cr20Ni80,Cr15Ni60.Cr20Ni35.Cr20Ni30
Kuwerengera kwa mauna: 2-100 mauna
Mawonekedwe: Kutalikira kwapamwamba, mphamvu yopondereza, kutha kwa pamwamba, kukana kwa okosijeni, kukana sulfure, permeability resistanee ndi ntchito zina.