Increasingly being specified, particularly in silvery metallic finish for roofing applications (standing seam and sandwich panels). Gives exceptionally long life. Field experience of silvery metallic coated 55% Al-Zn in most environments indicates a life on roofs of over 30 years before major maintenance. Corrosion resistance in marine, industrial and rural environments is 2-4 times better than that of hot-dip galvanised steel. Cut edge protection is also substantially better than that of galvanised, 5% Al-Zn or aluminised coated steel sheets. Resists temperatures up to 315ºC without damage or discolouration of the surface. The 55% Al-Zn coating gives excellent paint adhesion for both pre-painting (continuous coil coating) and post-painting if required. Available with attractive clear acrylic protection over the silvery finish, to resist surface marking and scuffing. This protection makes construction and maintenance easier.