NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

Interlaboratory "Pilot Run" Study of Small Heat-Flow-Meter Apparatus for ASTM C518.


pdf icon Interlaboratory "Pilot Run" Study of Small Heat-Flow-Meter Apparatus for ASTM C518. (880 K)
Zarr, R. R.; Lagergren, E. S.

Journal of Testing and Evaluation, Vol. 27, No. 6, 357-367, November 1999.

Keywords:

measuring instruments; heat transmission; equipment; glass fibers; reproducibility; thermal conductivity; thermal insulation

Abstract:

Thermal conductivity measurements of a high-den-ity glass-fiber thermal insulation material near 24 deg 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 guarded-hot-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.