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International Study of Guarded Hot Plate Laboratories Using Fibrous Glass and Expanded Polystyrene Reference Materials.


pdf icon International Study of Guarded Hot Plate Laboratories Using Fibrous Glass and Expanded Polystyrene Reference Materials. (367 K)
Zarr, R. R.; Filliben, J. J.

Insulation Materials: Testing and Applications. Volume 4. ASTM STP 1426. 2002, ASTM International, West Conshohocken, PA, Desjarlais, A. O.; Zarr, R. R., Editor(s)(s), 3-16 pp, 2003.

Keywords:

insulation; thermal conductivity; thermal insulation; certified reference material; guarded hot plate; reference materials; Standard Reference Materials (SRMs)

Abstract:

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.