ASTM E 96/E 96M - 10 Standard Test Methods for Water Vapor Transmission of Materials

American Society for Testing and Materials (ASTM). Current edition approved Oct. 1, 2010. Published February 2011. Originally approved in 1953. Last previous edition approved in 2000 as E96 – 00. 12 p. These test methods cover the determination of water vapor transmission (WVT) of materials through which the passage of water vapor may be of importance, such as paper, plastic films, other sheet materials, fiberboards, gypsum and plaster products, wood products, and plastics. The test methods are limited to specimens not over 11⁄4 in. (32 mm) in thickness except as provided in Section
9. Two basic methods, the Desiccant Method and the Water Method, are provided for the measurement of permeance, and two variations include service conditions with one side wetted and service conditions with low humidity on one side and high humidity on the other. Agreement should not be expected between results obtained by different methods. The method should be selected that more nearly approaches the conditions of use.