Interlaboratory "Pilot Run" Study of Small Heat-Flow-Meter Apparatus for ASTM C518.
Interlaboratory "Pilot Run" Study of Small
Heat-Flow-Meter Apparatus for ASTM C518.
Zarr, R. R.; Lagergren, E. S.
Journal of Testing and Evaluation, Vol. 27, No. 6,
357-367, November 1999.
measuring instruments; heat transmission; equipment;
glass fibers; reproducibility; thermal conductivity;
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.