International Study of Guarded Hot Plate Laboratories Using Fibrous Glass and Expanded Polystyrene Reference Materials.
International Study of Guarded Hot Plate Laboratories
Using Fibrous Glass and Expanded Polystyrene Reference
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.
insulation; thermal conductivity; thermal insulation;
certified reference material; guarded hot plate;
reference materials; Standard Reference Materials (SRMs)
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.