Journal Published Online: 01 November 1999
Volume 27, Issue 6

Interlaboratory “Pilot Run” Study of Small Heat-Flow-Meter Apparatus for ASTM C 518



Thermal conductivity measurements of a high-density glass-fiber thermal insulation material near 24°C are presented for the determination of the precision and bias of ASTM Test Method C 518. The measurements have been conducted by 13 laboratories using small (305 by 305-mm) heat-flow-meter apparatus on three specimens of high-density glass-fiber thermal insulation material that were circulated among the laboratories. Test results are analyzed using ASTM Practice E 691 and subsequently compared to measurements of the same specimens conducted in a guardedhot-plate apparatus using ASTM Test Method C 177. The 95% repeatability and reproducibility indexes for precision have been determined to be no worse than 1.1 and 4.0%, respectively. A method for estimating bias is presented.

Author Information

Zarr, RR
National Institute of Standards and Technology, Gaithersburg, MD
Lagergren, ES
Nabisco, East Hanover, NJ
Pages: 11
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: JTE12163J
ISSN: 0090-3973
DOI: 10.1520/JTE12163J