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An improved understanding of the heat flow processes in thermal insulations has mandated a conceptual revision of the basic ASTM test methods [ASTM Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Guarded Hot Plate (C 177-76), ASTM Book of Standards, Part 18, and ASTM Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter (C 518-76), ASTM Book of Standards, Part 18] applicable to heat transmission through thermal insulations. The test methods as previously written allowed almost exclusively the measurement of thermal conductivity, a property which thermal insulations, for the most part, do not have. The author discusses the factors which have prompted the change.
test data, thermal conductivity, thermal performance, insulations, thermal, infrared radiation, thickness effects, temperature effects, heat flow mechanisms
Senior research specialist, Johns-Manville Research and Development Center, Denver, Colo.