A case study on how to maintain confidence of thermal properties test: Thermal conductivity of building insulation materials

This study discussed methods for improving confidence on results of measurement and test focusing thermal conductivity test of building insulation materials. The proposed methods in this study were: (1) maintenance of traceability by correction of test equipments; (2) performance evaluation by statistical analysis and control chart; (3) inter-tester comparative proficiency testing by outputting robust statistics and Z-scores. Through confirmation of equipment maintenance condition, verification of test process, observation of variation factor and improvement, output of accuracy, retaining of researcher, improvement of proficiency, we will heighten precision and accuracy of test and improve confidence abroad.