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ASTM E 398 : 2020

Current
Current

The latest, up-to-date edition.

Standard Test Method for Water Vapor Transmission Rate of Sheet Materials Using Dynamic Relative Humidity Measurement
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

08-07-2020

1.1This test method covers dynamic evaluation of the rate of transfer of water vapor through a flexible barrier material and allows conversion to the generally recognized units of water vapor transmission (WVT) as obtained by various other test methods including the gravimetric method described in Test Methods E96/E96M.

1.2Limitations—This test method is limited to flexible barrier sheet materials composed of either completely hydrophobic materials, or combinations of hydrophobic and hydrophilic materials having at least one surface that is hydrophobic.

1.3The minimum test value obtained by this test method is limited by the leakage of water vapor past the clamping seals of the test instrument. A reasonable value may be approximately 0.01 g/24 h·m2 for any WVTR method including the desiccant procedure of Test Methods E96/E96M at 37.8 °C, and 90 % relative humidity. This limit can be checked for each instrument with an impervious specimen such as aluminum foil. Calibration procedures can compensate for the leakage rate if so stated.

1.4This test method is not suitable for referee testing at this time, but is suitable for control testing and material comparison.

1.5Several other ASTM test methods are available to test a similar property. This test method is unique in that it closely duplicates typical product storage where a transfer of moisture from a package into the environment is allowed to proceed without constantly sweeping the environmental side with dry gas. Methods with constantly swept dry sides include Test Methods F1249 and F3299.

1.6The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7This 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.

1.8This 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.

Committee
F 02
DocumentType
Test Method
Pages
5
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

ASTM C 168 : 2019 Standard Terminology Relating to Thermal Insulation
ASTM E 177 : 1990 : REV A : R1996 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
ASTM E 96/E96M : 2022 : REV A : EDT 1 Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
ASTM E 96/E96M : 2022 : REV A Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
ASTM E 96/E96M : 2021 Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
ASTM E 96/E96M : 2022 Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
ASTM F 3299 : 2018 Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using an Electrolytic Detection Sensor (Coulometric P<inf>2</inf>O<inf >5</inf> Sensor)
ASTM E 691 : 2020 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E 96/E96M : 2023 Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
ASTM E 96/E96M : 2024 Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
ASTM F 3299 : 2018 : R2023 Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using an Electrolytic Detection Sensor (Coulometric P<inf>2</inf>O<inf >5</inf> Sensor)
ASTM E 691 : 2019 : EDT 1 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E 691 : 2023 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E 691 : 2022 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E 96/E96M : 2016 Standard Test Methods for Water Vapor Transmission of Materials
ASTM E 691 : 2009 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E 691 : 2021 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM C 168 : 2022 Standard Terminology Relating to Thermal Insulation

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