SYMPOSIA PAPER Published: 01 January 1997

A Variability Study on the ASTM Thin Slicing and Scaling Test Method for Evaluating the Long-Term Performance of an Extruded Polystyrene Foam Blown with HCFC-142b


The ASTM accelerated aging test method for unfaced foamboard insulation that is based on slicing and scaling has been used on an extruded polystyrene product blown with HCFC-142b. The test method including specimen preparation was carried out at three laboratories. The participating laboratories used different means to prepare thin test specimens. Thin slices of foamboard with and without surface skins were tested in order to assess the effect of skins on the aging process.

Measured values for the apparent thermal conductivity, ka, were used to calculate time average ka for life-times of 10, 20, and 40 years. The time-average ka, from the three laboratories differed by less than 2.5% for 1.5-inch-thick product and less than 2% for 2.0-inch-thick product. The ka for slices with skin on one surface were less than ka of slices of the core foam.

Author Information

Fabian, BA
UCI-Owens Corning Speciality and Foam Products, Tallmadge, Ohio
Graves, RS
R & D Services, Inc., Lenoir City, Tennessee
Hofton, MR
Celfortec, Inc., Valleyfield, Quebec, Canada
Yarbrough, DW
R & D Services, Inc., Lenoir City, Tennessee
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Developed by Committee: C16
Pages: 197–215
DOI: 10.1520/STP12275S
ISBN-EB: 978-0-8031-5373-8
ISBN-13: 978-0-8031-2409-7