SYMPOSIA PAPER Published: 01 January 1980

Discussion on Experiments to Separate the “Effect of Thickness” from Systematic Equipment Errors in Thermal Transmission Measurements


The radiation-related “effect of thickness” in nonhomogeneous insulations can be readily confused with equipment-related effects resulting from increases in the thickness of the measurement. The relatively unexplored effect-of-thickness phenomenon and the requirements imposed by the ASTM Tests for Steady-State Thermal Transmission Properties by Means of the Guarded Hot Plate and Heat Flow Meter (C 177–76 and C 518–76, respectively) have prompted the rapid development of equipment to measure insulations at full-use thickness.

This paper discusses the problems which arise from attempts to accurately measure insulations at full thickness, a relatively unknown area of measurement, and suggests a method for the separation of the actual effect-of-thickness phenomenon from the errors induced by the equipment.

Author Information

Pelanne, CM
Johns-Manville Research and Development Center, Denver, Colo
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Developed by Committee: C16
Pages: 322–334
DOI: 10.1520/STP29283S
ISBN-EB: 978-0-8031-4786-7
ISBN-13: 978-0-8031-0794-6