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1.1 This test method covers two procedures for determining the compressive resistance of thermal insulations.
1.1.1 Procedure A covers thermal insulations having an approximate straight-line portion of a load-deformation curve, but that may or may not have an identifiable yield point as shown in Figs. 1 and 2. Such behavior is typical of most rigid board or block-type insulations.
1.1.2 Procedure B covers thermal insulations that become increasingly more stiff as load is increased, as shown in . Such behavior is typical of fibrous batt and blanket insulations that have been compressed previously to at least the same deformation by compression packaging or mechanical softening.