SYMPOSIA PAPER Published: 01 January 1990

Evaluation of Long-Term Thermal Resistance of Gas-filled Foams: State of the Art


Some cellular plastics (foams) incorporate a chlorofluorocarbon (CFC) to improve their thermal insulating properties. During the service life of this type of insulation air diffuses into the foam cells and the CFC gas diffuses out, each at a rate that depends on type of polymer and temperature, eventually reducing the effectiveness of insulation. This effect is known as aging. Although literature on the aging process is extensive, there are no generally accepted procedures for evaluating long-term thermal resistance of new gas-filled foams. The mechanisms of the aging process are reviewed, and integrated approach to the evaluation of aging of gas-filled foams is proposed.

Author Information

Bomberg, M
Institute for Research in Construction, National Research Council of Canada, Ottawa, Ontario, Canada
Brandreth, DA
Widener University, Chester, PA
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: C16
Pages: 156–173
DOI: 10.1520/STP23304S
ISBN-EB: 978-0-8031-5109-3
ISBN-13: 978-0-8031-1278-0