SYMPOSIA PAPER Published: 01 January 1990

A Round Robin on Apparent Thermal Conductivity of Several Loose-Fill Insulations


The primary means of establishing the thermal performance of loose-fill insulation is ASTM Standard Practice C 687. To provide information for the development of a statement of precision and bias for this Standard Practice, a round robin was carried out by eleven laboratories measuring apparent thermal conductivity of four common loose-fill insulation products (cellulose, rock/slag wool, and bonded and unbonded glass fiber) and a glass fiber blanket.

The test results on the glass fiber blanket indicate that the measurement capability of the participants can be characterized by an imprecision of 3.0%, as measured by two standard deviations, and a negligible bias of the mean. The measurements on the loose-fill materials are characterized by an imprecision ranging from 21% for cellulose to 10% for the rock/slag wool. The increase in imprecision for the loose-fill materials is attributed primarily to inadequately defined procedures for preparing and conditioning the specimens.

Author Information

Adams, RD
Owens/Corning Fiberglas, Product Testing Laboratories, Granville, OH
Hust, JG
National Bureau of Standards, Boulder, CO
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Developed by Committee: C16
Pages: 263–289
DOI: 10.1520/STP23314S
ISBN-EB: 978-0-8031-5109-3
ISBN-13: 978-0-8031-1278-0