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ASTM E96/E96M-10

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Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials

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1.1 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 1¼ 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.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. However, derived results can be converted from one system to the other using appropriate conversion factors (see Table 1).


The purpose of these tests is to obtain, by means of simple apparatus, reliable values of water vapor transfer through permeable and semipermeable materials, expressed in suitable units. These values are for use in design, manufacture, and marketing. A permeance value obtained under one set of test conditions may not indicate the value under a different set of conditions. For this reason, the test conditions should be selected that most closely approach the conditions of use. While any set of conditions may be used and those conditions reported, standard conditions that have been useful are shown in Appendix X1.

SDO ASTM: ASTM International
Document Number E96
Publication Date Oct. 1, 2010
Language en - English
Page Count 12
Revision Level 10
Supercedes
Committee C16.33
Publish Date Document Id Type View
Nov. 1, 2024 E0096_E0096M-24A Revision
March 1, 2024 E0096_E0096M-24 Revision
Nov. 15, 2023 E0096_E0096M-23 Revision
Oct. 15, 2022 E0096_E0096M-22AE01 Revision
Oct. 15, 2022 E0096_E0096M-22A Revision
March 1, 2022 E0096_E0096M-22 Revision
Sept. 15, 2021 E0096_E0096M-21 Revision
March 1, 2016 E0096_E0096M-16 Revision
May 1, 2015 E0096_E0096M-15 Revision
Oct. 15, 2014 E0096_E0096M-14 Revision
Nov. 1, 2013 E0096_E0096M-13 Revision
Dec. 15, 2012 E0096_E0096M-12 Revision
Oct. 1, 2010 E0096_E0096M-10 Revision
May 1, 2005 E0096_E0096M-05 Revision