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ASTM E96/E96M-2012 Standard Test Methods for Water Vapor Transmission of Materials

Standard Number:  ASTM E96/E96M-2012
Title:  Standard Test Methods for Water Vapor Transmission of Materials
Language:  English
Replaced by Standard:  ASTM E96/E96M-13

Replacing Standard:  SS ASTM E96/E96M-2010

Execute Date:  2012/12/15
Status:  Withdrawn
International Classification for Standards (ICS)METALLURGY>>Testing of metals>>Other methods of testing of metals
Publisher:  American Society for Testing Material (ASTM)
Number of Pages:12P.;A4  


5.1x00a0;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.

1.1x00a0;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 11/4x00a0;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.

1.2x00a0;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).

TABLE 1 Metric Units and Conversion FactorsA,B



To Obtain (for the
same test condition)





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File Size:  127KB
Tile in English:  Standard Test Methods for Water Vapor Transmission of Materials

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