- Author
- Zarr, R. R. | Filliben, J. J.
- Title
- International Study of Guarded Hot Plate Laboratories Using Fibrous Glass and Expanded Polystyrene Reference Materials.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Insulation Materials: Testing and Applications. Volume 4. ASTM STP 1426. 2002, ASTM International, West Conshohocken, PA, Desjarlais, A. O.; Zarr, R. R., Editors, 3-16 p., 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.