ISO 23993:2008提供了从声明的热导率计算建筑设备和工业设施的热性能的设计热导率的方法。 这些方法适用于-200°C至800°C的工作温度。 根据不同影响确定的转换因子，适用于相关条款或附件所示的温度范围

ISO 23993:2008 gives methods to calculate design thermal conductivities from declared thermal conductivities for the calculation of the thermal performance of building equipment and industrial installations. These methods are valid for operating temperatures from -200 °C to +800 °C. The conversion factors, established for the different influences, are valid for the temperature ranges indicated in the relevant clauses or annexes.