Report on inter-laboratory comparison of guarded hot plate measurements

THE GUARDED HOT-PLATE apparatus is the primary standard for the measurement of thermal conductivities of thermally insulating materials. Standard test procedures using the guarded hot plate are prescribed by ASTM and ISO. In principle, the values of thermal conductivities determined using a well-designed apparatus could be accurate to between 0.5% and 1%, but experience shows that the design, construction and operation of a guarded hot plate apparatus are very challenging tasks and it is not always possible to attain the highest theoretical accuracy.L?APPAREIL \uc0 \uc9L\uc9MENT DE CHAUFFAGE \uc0 CARTER DE PROTECTION repr\ue9sente la norme principale de mesure des valeurs de conductivit\ue9 thermique de mat\ue9riaux d?isolation thermique. Les proc\ue9dures d?essai normalis\ue9es utilisant l?\ue9l\ue9ment de chauffage \ue0 carter de protection sont celles prescrites par l?ASTM et l?ISO. En principe, les valeurs de conductivit\ue9 thermique d\ue9termin\ue9es au moyen d?un appareil bien con\ue7u pourraient \ueatre pr\ue9cises dans une plage allant de 0,5 % \ue0 1,0 %. Or, l?exp\ue9rience nous apprend que la conception, la construction et l?utilisation d?un appareil \ue0 \ue9l\ue9ment de chauffage \ue0 carter de protection pr\ue9sentent un d\ue9fi de taille, et il n?est pas toujours possible de parvenir au maximum de pr\ue9cision th\ue9orique.Peer reviewed: YesNRC publication: Ye