Standard Test Method for Moisture Retention Curves of 1. Scope. 1.1 This test method specifies a laboratory procedure for the determination of the water retention curve (or moisture storage capacity) of porous building materials at very high relative humidity (RH) levels (≈ 95 to 100% RH) corresponding to the capillary moisture region of the sorption isotherm.This is achieved by using the pressure plate test apparatus.
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