Thermal conductivity measurements of four thermal insulation reference aterials are presented. The measurements were obtained from an international study of guarded-hot-plate laboratories in Canada, France, Japan, the United Kingdom, and the United States. For each reference material, the study requires five independent replicate measurements at a fixed temperature of 297.15 K, and single-point measurements at 280 K, 290 K, 300 K, 310 K, and 320 K. An important finding from the replicate analysis is the existence of a laboratory-material interaction; that is, there are laboratory- to-laboratory differences in both location and variation that change from material to material. The major underlying source for the variability (both within- and between- laboratory) in the replicate data is discussed. The analysis of the multi-temperature (280 K to 320 K) data supports the laboratory-material interaction as exhibited in the fixed-temperature replicate data. The multi-temperature analysis also reveals an increasing difference between laboratories as the temperature departs from 297.15 K.
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