ASTM E96 / E96M - 13

    Standard Test Methods for Water Vapor Transmission of Materials

    Active Standard ASTM E96 / E96M | Developed by Subcommittee: C16.33

    Book of Standards Volume: 04.06


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    Significance and Use

    5.1 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.

    1. Scope

    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 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.

    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).

    TABLE 1 Metric Units and Conversion FactorsA,B

    Multiply

    by

    To Obtain (for the
    same test condition)

    WVT

     g/h·m2

    1.43

      grains/h·ft2

     grains/h·ft2

    0.697

      g/h·m2

    Permeance

     g/Pa·s·m2

    1.75 × 107

      1 Perm (inch-pound)

     1 Perm (inch-pound)

    5.72 × 108

       g/Pa·s·m2

    Permeability

     g/Pa·s·m

    6.88 × 108

      1 Perm inch

     1 Perm inch

    1.45 × 109

       g/Pa·s·m

    A These units are used in the construction trade. Other units may be used in other standards.
    B All conversions of mm Hg to Pa are made at a temperature of 0°C.

    1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C168 Terminology Relating to Thermal Insulation

    D449 Specification for Asphalt Used in Dampproofing and Waterproofing

    D2301 Specification for Vinyl Chloride Plastic Pressure-Sensitive Electrical Insulating Tape

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    ICS Code

    ICS Number Code 77.040.99 (Other methods of testing metals)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/E0096_E0096M

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