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ASTM D6701-24

Current Revision

Standard Test Method for Determining Water Vapor Transmission Rates Through Nonwoven and Plastic Barriers

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1.1 This test method covers a procedure for determining the rate of water vapor transmission ranging between 500 to 100 000 g/(m2·day) through nonwoven and plastic barrier materials. The method is applicable to films, barriers consisting of single or multilayer synthetic or natural polymers, nonwoven fabric, and nonwoven fabrics coated with films up to 3 mm (0.1 in.) in thickness. This method is quantitative and has been demonstrated by the enclosed Table 1 Summary of Precision and Bias Analysis to be effective for measuring the water vapor transmission rate of materials from 7586 g/(m2·day) to 51 996 g/(m2·day).

1.2 This test method provides for the determination of (1) water vapor transmission rate (WVTR), and (2) the permeance to water vapor.

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. The acceptable units for WVTR are usually g/(m2·day).

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

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 The purpose of this test method is to obtain values for the WVTR of barrier materials.

5.2 WVTR is an important property of materials and can be related to shelf life; product stability, breath-ability, and wearing comfort.

5.3 Data from this test method is suitable as a referee method of testing, provided that the purchaser and seller have agreed on sampling procedures, test conditions, and acceptance criteria.

SDO ASTM: ASTM International
Document Number D6701
Publication Date May 1, 2024
Language en - English
Page Count 6
Revision Level 24
Supercedes
Committee F02.10
Publish Date Document Id Type View
May 1, 2024 D6701-24 Revision
Feb. 1, 2021 D6701-21 Revision
Aug. 1, 2016 D6701-16 Revision
Aug. 10, 2001 D6701-01 Revision