... quality certification TUV,UL lower price 1.Performace and use :Quartz heating elements do not paint, radiation rate stability, high temperature ... -chromium alloy wire Cr20Ni80) as the heating body, high-quality quartz glass tube as an insulator and thermal conductor, both end with nickel ... -corrosion, small thermal inertia , high thermal conversion efficiency . Economical electric quartz heating tube