The pore structure of fibrous building insulation materials such as glass wool and rock wool differs significantly from that of rigid building materials like concrete and brick. These fibrous materials are mainly composed of solid fibers and air voids, with a large number of interconnected pores inside, which change heat transfer paths and even cause material deformation during thermal conductivity testing. Therefore, differences in test principles and conditions among various methods lead to deviations in thermal conductivity test results of such fibrous building thermal insulation materials. This paper discusses the applicability of the protective hot plate method, transient plane source method and hot wire method in testing the thermal conductivity of fibrous thermal insulation materials with different densities under various temperature conditions, and compares and analyzes the differences in measured data. Taking the test results of the protective hot plate method as a benchmark, this paper corrects the transient test method. The results show that within the temperature range of 20~50 ℃, the correction parameters of the transient plane source method are 0.79~1.06 for glass wool and 0.72~0.94 for rock wool, while those of the hot-wire method range from 0.97~1.2 for glass wool and 0.94~1.04 for rock wool.
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