Thermal conductivity measurements of four thermal insulation reference materials are presented. The measurements were obtained from an international study of guarded-hot-plate laboratories from Canada, France, Japan, United Kingdom, and 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 from 280 K to 290 K 300 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 in 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.
Proceedings Title: Insulation Materials: Testing and Applications, Symposium | 4th | Insulation Materials: Testing and Applications: ASTM Special Technical Publication | ASME
Conference Dates: October 21-22, 2002
Conference Title: American Society of Mechanical Engineers
Pub Type: Conferences
certified reference material, guarded hot plate, interlaboratory, reference materials, SRM, thermal conductivity, thermal insulation