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Summary This study presents the results of a set of tests for the determination of the thermal conductivity coefficient of samples extracted from boards of Insulation Corkboard (ICB) withdrawn from the usual production of the seven portuguese factories. These tests were carried out as a part of an interlaboratorial study integrated in the standardization program for cork of the sub-comission 4 of The National Technical Committee of Standardization (CT 16), in which participated the Cork Technological Centre (CTCOR), the National Laboratory of Civil Enginneering (LNEC) and the National Institute of Engineering and Industrial Technology (INETI). The purpose of this study aimed to contribute to the definition of the “declared value” of this thermal property to be included in the future European Standard (EN) specifying the characteristics of ICB for thermal insulating of buildings which is in preparation in the 88Th Technical Committee of The European Committee of Standardization CEN/TC-88 (CEN 1995). In view of the results, the declared value of thermal conductivity proposed was 0.045 W/m. ∘C.
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