標準號：BS EN 12939-2001
中文標準名稱：建筑材料和產品的熱性能.用護熱板和熱流計測定熱阻.高和中熱阻的厚產品
英文標準名稱：Thermal performance of building materials and products - Determination of thermal resistance by means of guarded hot plate and heat flow meter methods - Thick products of high and medium thermal resistance
標準類型：Q04
發布日期：2001/1/15 12:00:00
實施日期：2001/1/15 12:00:00
中國標準分類號：Q04
國際標準分類號：91.100.60
適用范圍：This standard gives the procedures to determine the thermal resistance of products the thicknesses of which exceed the maximum thickness for guarded hot plate 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 resistances 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.