SYMPOSIA PAPER Published: 01 January 2002

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


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.

Author Information

Zarr, RR
National Institute of Standards and Technology, Gaithersburg, MD
Filliben, JJ
National Institute of Standards and Technology, Gaithersburg, MD
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Developed by Committee: C16
Pages: 3–16
DOI: 10.1520/STP11001S
ISBN-EB: 978-0-8031-5469-8
ISBN-13: 978-0-8031-2898-9