Heat build-up testing of coloured steel panels

A series of painted steel panels ranging in colour from white to black, have been assessed for heat buildup under the Australian summer sun. The heat buildup in these panels varied considerably. Three different laboratory techniques were investigated for the prediction of exterior heat buildup in a painted substrate. All techniques proved to have some potential, in particular the third technique which involved simple CIE L value measurements. In this article the beat buildup results have also been related to the requirements of the European Parliament and Council Directive 94/63/EC/Part 1, Annex.