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Aging of Polyurethane Foam Insulation in Simulated Refrigerator Panels—Two-Year Results with Third-Generation Blowing Agents

W. Alex Gabbard

Fred J. Weaver

Oak Ridge National Laboratory P.O. Box 2008 Oak Ridge, TN 37831-6092

J. Richard Booth

Department of Chemical Engineering Tennessee Technological University Cookeville, TN 38505

Laboratory data are presented on the effect of constant-temperature aging on the apparent thermal conductivity of polyurethane foam insulation for refrigerators and freezers. The foam specimens were blown with HCFC-141b and with three of its potential replacements—HFC-134a, HFC-245fa, and cyclopentane. Specimens were aged at constant temperatures of 90°F, 40°F, and-10°F. Thermal conductivity measurements were made on two types of specimens: full-thickness simulated refrigerator panels containing foam enclosed between solid plastic sheets, and thin slices of core foam cut from similar panels. Results are presented for the first two years of amulti-year aging study. Preliminary comparisons of measured data with predictions of a mathematical aging model are presented.

Journal of Cellular Plastics, Vol. 37, No. 5, 400-428 (2001)
DOI: 10.1106/N9XJ-PKE1-N3UV-DWJQ


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