ASTM D6701-21
(Test Method)Standard Test Method for Determining Water Vapor Transmission Rates Through Nonwoven and Plastic Barriers
Standard Test Method for Determining Water Vapor Transmission Rates Through Nonwoven and Plastic Barriers
SIGNIFICANCE AND USE
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.
SCOPE
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.
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.
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Standards Content (Sample)
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.
Designation: D6701 − 21
Standard Test Method for
Determining Water Vapor Transmission Rates Through
1
Nonwoven and Plastic Barriers
This standard is issued under the fixed designation D6701; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
3
1. Scope D1898 Practice for Sampling of Plastics (Withdrawn 1998)
D4204 Practice for Preparing Plastic Film Specimens for a
1.1 This test method covers a procedure for determining the
Round-Robin Study
rate of water vapor transmission ranging between 500 to
D5729 Test Method for Thickness of Nonwoven Fabrics
2
100 000 g⁄(m ·day) through nonwoven and plastic barrier
3
(Withdrawn 2008)
materials.Themethodisapplicabletofilms,barriersconsisting
E177 Practice for Use of the Terms Precision and Bias in
of single or multilayer synthetic or natural polymers, nonwo-
ASTM Test Methods
venfabric,andnonwovenfabricscoatedwithfilmsupto3 mm
E691 Practice for Conducting an Interlaboratory Study to
(0.1 in.) in thickness.
Determine the Precision of a Test Method
1.2 This test method provides for the determination of (1) F1249 Test Method for Water Vapor Transmission Rate
water vapor transmission rate (WVTR), and (2) the permeance
Through Plastic Film and Sheeting Using a Modulated
to water vapor. Infrared Sensor
1.3 The values stated in SI units are to be regarded as
3. Terminology
standard. The values given in parentheses after SI units are
3.1 Definitions:
provided for information only and are not considered standard.
2 3.1.1 water vapor permeability coeffıcient, n—the ratio of
The acceptable units for WVTR are usually g/(m ·day).
the permeance and the thickness.
1.4 This standard does not purport to address all of the
3.1.1.1 Discussion—This quantity should not be used unless
safety concerns, if any, associated with its use. It is the
the relationship between thickness and permeance has been
responsibility of the user of this standard to establish appro-
verified in tests using several thickness’ of the material. The
priate safety, health, and environmental practices and deter-
water vapor permeability is meaningful only for homogeneous
mine the applicability of regulatory limitations prior to use.
materials, in which case it is a property characteristic of bulk
1.5 This international standard was developed in accor-
material. An accepted unit of water vapor permeability is the
2
dance with internationally recognized principles on standard-
metric perm centimeter, or 1 g per m per day per mm Hg-cm
2
ization established in the Decision on Principles for the
of thickness. The SI unit is the mol/(m -s-Pa-mm).
Development of International Standards, Guides and Recom-
3.1.2 water vapor permeance, n—the ratio of a barrier’s
mendations issued by the World Trade Organization Technical
water vapor transmission rate to the vapor pressure difference
Barriers to Trade (TBT) Committee.
between the two surfaces.
3.1.2.1 Discussion—An accepted unit of water vapor per-
2. Referenced Documents 2
meance is the metric perm, or 1 g/m per day per mm Hg. The
2
2
SI unit is the mol/(m -s-Pa). Since the water vapor permeance
2.1 ASTM Standards:
of a specimen is generally a function of relative humidity and
D123 Terminology Relating to Textiles
temperature, therefore those conditions must be stated.
3.1.3 water vapor transmission rate (WVTR), n—thesteady-
state time rate of water vapor flow through unit area of a
1
This test method is under the jurisdiction ofASTM Committee F02 on Primary
Barrier Packaging and is the direct responsibility of Subcommittee F02.10 on specimen, normal to the surfaces under specific conditions of
Permeation.
temperature and humidity at each surface.
Current edition approved Feb. 1, 2021. Published February 2021. Originally
3.1.3.1 Discussion—A common practice accepted unit of
approved in 2001. Last previous edition approved in 2016 as D6701 – 16. DOI:
2
water vapor transmission rate is metric g/m per day. The test
10.1520/D6701-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6701 − 16 D6701 − 21
Standard Test Method for
Determining Water Vapor Transmission Rates Through
1
Nonwoven and Plastic Barriers
This standard is issued under the fixed designation D6701; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a procedure for determining the rate of water vapor transmission ranging between 500 to 100,000
2
100 000 g g/m⁄(m day·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.) 3 mm (0.1 in.) in thickness.
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 metricSI units are to be regarded as the standard. The standard. The values given in parentheses after SI
units are provided for information only and are not considered standard. The acceptable units for water vapor transmission rate
2
WVTR are usually g/mg/(m day.·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 safety, health, and healthenvironmental 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
3
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
D4204 Practice for Preparing Plastic Film Specimens for a Round-Robin Study
3
D5729 Test Method for Thickness of Nonwoven Fabrics (Withdrawn 2008)
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
F1249 Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor
1
This test method is under the jurisdiction of ASTM Committee F02 on FlexiblePrimary Barrier Packaging and is the direct responsibility of Subcommittee F02.10 on
Permeation.
Current edition approved Aug. 1, 2016Feb. 1, 2021. Published September 2016February 2021. Originally approved in 2001. Last previous edition approved in 20012016
as D6701–01, which was withdrawn in October 2008 and reinstated in August 2016. – 16. DOI: 10.1520/D6701-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6701 − 21
3. Terminology
3.1 Definitions:
3.1.1 water vapor permeability coeffıcient, n—the ratio of the permeance and the thickness.
3.1.1.1 Discussion—
This quantity should not be used unless the relationship between thickness and permeance has been verified in tests using several
thickness’thickness’ of the material. The water vapor permeability is meaningful only for homogeneous materials, in which case
it is a property characteristic of bulk material. An accepted unit of water vapor permeability is the metric perm centimeter, or 1g
2 2
1 g per m per day per mm Hg-cm of thickness. The SI unit is the mol/mmol/(m -s-Pa-mm.-s-Pa-mm).
3.1.2 water vapor permeance, n—the ratio of a barrier’sbarrier’s water vapor transmission rate to the vapor pressure difference
between the two surfaces.
3.1.2.1 Discussion—
2
An accepted unit of water vapor permeance is the metric perm, or 1 g/m per day per mm Hg. The SI unit is the
2
mol/mmol/(m -s-Pa.-s-Pa). Since the water vapor permeance of a specimen is generally
...
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