DIN EN 12939:2001
建筑材料和產品熱性能.用防護熱板和熱流量計測定熱阻.厚產品的高熱阻和中熱阻
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; German version EN 12939:2000