DANSK DS/EN 12939 PDF

This standard gives the procedures to determine the thermal resistance of products the thickness of which exceed the maximum thickness for guarded hot plade or heat flow meter apparatus. In any case most of the procedures described in this standard require apparatus that allows tests on specimens up to 100 mm thick. This standard gives guidelines to assess the relevance of the thickness effect, i.e. to establish whether the thermal resistance of a thick product can or cannot be calculated as the sum of the thermal resistance of slices cut from the product, these guidelines complement the indications given in ISO 8302:1991 on the guarded hot plate apparatus. This standard describes testing conditions which prevent the onset of convection, which could take place in some products under the considered temperature differences and thicknesses.