ASTM F1249-06
(Test Method)Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor
Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor
SCOPE
1.1 This test method covers a procedure for determining the rate of water vapor transmission through flexible barrier materials. The method is applicable to sheets and films up to 3 mm (0.1 in.) in thickness, consisting of single or multilayer synthetic or natural polymers and foils, including coated materials. It provides for the determination of ( 1) water vapor transmission rate (WVTR), (2) the permeance of the film to water vapor, and (3) for homogeneous materials, water vapor permeability coefficient. Note 1Values for water vapor permeance and water vapor permeability must be used with caution. The inverse relationship of WVTR to thickness and the direct relationship of WVTR to the partial pressure differential of water vapor may not always apply.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F1249–06
Standard Test Method for
Water Vapor Transmission Rate Through Plastic Film and
1
Sheeting Using a Modulated Infrared Sensor
This standard is issued under the fixed designation F1249; 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.
Note—Paragraph 13.1.1 was editorially corrected and the year date was changed on June 22, 2006.
1. Scope E104 Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions
1.1 This test method covers a procedure for determining the
E178 Practice for Dealing With Outlying Observations
rate of water vapor transmission through flexible barrier
E691 Practice for Conducting an Interlaboratory Study to
materials. The method is applicable to sheets and films up to 3
Determine the Precision of a Test Method
mm (0.1 in.) in thickness, consisting of single or multilayer
synthetic or natural polymers and foils, including coated
3. Terminology
materials. It provides for the determination of (1) water vapor
3.1 Definitions:
transmission rate (WVTR), (2) the permeance of the film to
3.1.1 water vapor permeability coeffıcient—the product of
water vapor, and (3) for homogeneous materials, water vapor
the permeance and the thickness of the film. The permeability
permeability coefficient.
is meaningful only for homogeneous materials, in which case
NOTE 1—Values for water vapor permeance and water vapor perme-
it is a property characteristic of bulk material.
ability must be used with caution. The inverse relationship of WVTR to
3.1.1.1 Discussion—Thisquantityshouldnotbeusedunless
thickness and the direct relationship of WVTR to the partial pressure
the relationship between thickness and permeance has been
differential of water vapor may not always apply.
verified in tests using several thicknesses of the material. An
1.2 This standard does not purport to address all of the
accepted unit of permeability is the metric perm centimeter, or
safety concerns, if any, associated with its use. It is the 2
1 g/m per day per mm Hg·cm of thickness. The SI unit is the
responsibility of the user of this standard to establish appro- 2
mol/m ·s·Pa·mm. The test conditions (see 3.1) must be stated.
priate safety and health practices and determine the applica-
3.1.2 water vapor permeance—the ratio of a barrier’s
bility of regulatory limitations prior to use.
WVTR to the vapor pressure difference between the two
surfaces.
2. Referenced Documents
3.1.2.1 Discussion—An accepted unit of permeance is the
2
2.1 ASTM Standards: 2
metric perm, or 1 g/m per day per mm Hg. The SI unit is the
D374 Test Methods for Thickness of Solid Electrical Insu- 2
mol/m ·s·Pa. Since the permeance of a specimen is generally a
lation
function of relative humidity and temperature, the test condi-
3
D1898 Practice for Sampling of Plastics
tions must be stated.
E96/E96M Test Methods for Water Vapor Transmission of
3.1.3 water vapor transmission rate (WVTR)—the time rate
Materials
of water vapor flow normal to the surfaces, under steady-state
conditions, per unit area.
2
3.1.3.1 Discussion—An accepted unit ofWVTR is g/m per
1
This test method is under the jurisdiction ofASTM Committee F02 on Flexible
day. The test conditions of relative humidity and temperature
Barrier Packaging and is the direct responsibility of Subcommittee F02.10 on
Permeation.
where the humidity is the difference in relative humidity across
Current edition approved June 22, 2006. Published June 2006. Originally
the specimens, must be stated.
approved in 1989. Last previous edition approved in 2005 as F1249 – 05. DOI:
10.1520/F1249-06.
4. Summary of Test Method
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
4.1 A dry chamber is separated from a wet chamber of
Standards volume information, refer to the standard’s Document Summary page on
known temperature and humidity by the barrier material to be
the ASTM website.
3 tested. The dry chamber and the wet chamber make up a
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org. diffusion cell in which the test film is sealed. Water vapor
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
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F1249–06
FIG. 2 Conditioning System
FIG. 1 Measuring System
6.1.1.1 Diffusion Cell O–Ring—An appropriately sized
diffusing through the film mixes with the gas in the dry
groove machined into the humid chamber side of the diffusion
chamberandisc
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:F1249–90(Reapproved 1995) Designation:F1249–06
Standard Test Method for
Water Vapor Transmission Rate Through Plastic Film and
1
Sheeting Using a Modulated Infrared Sensor
This standard is issued under the fixed designation F 1249; 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.
Note—Paragraph 13.1.1 was editorially corrected and the year date was changed on June 22, 2006.
1. Scope
1.1 This test method covers a procedure for determining the rate of water vapor transmission through flexible barrier materials.
Themethodisapplicabletosheetsandfilmsupto3mm(0.1in.)inthickness,consistingofsingleormultilayersyntheticornatural
polymers and foils, including coated materials. It provides for the determination of ( 1) water vapor transmission rate (WVTR),
(2) the permeance of the film to water vapor, and (3) for homogeneous materials, water vapor permeability coefficient.
NOTE 1—Values for water vapor permeance and water vapor permeability must be used with caution. The inverse relationship of WVTR to thickness
and the direct relationship of WVTR to the partial pressure differential of water vapor may not always apply.
1.2 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D 374 Test Methods for Thickness of Solid Electrical Insulation
3
D 1898 Practice for Sampling of PlasticsD4204Practice for Preparing Plastic Film Specimens for a Round-Robin Study
E 96/E 96M Test Methods for Water Vapor Transmission of Materials
E 104 Practice for Maintaining Constant Relative Humidity by Means ofAqueous Solutions Practice for Maintaining Constant
Relative Humidity by Means of Aqueous Solutions
E 178 Practice for Dealing With Outlying Observations
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 water vapor permeability coeffıcient—the product of the permeance and the thickness of the film. The permeability is
meaningful only for homogeneous materials, in which case it is a property characteristic of bulk material.
3.1.1.1 Discussion—This quantity should not be used unless the relationship between thickness and permeance has been
2
verified in tests using several thicknesses of the material.An accepted unit of permeability is the metric perm centimeter, or 1 g/m
2
per day per mm Hg·cm of thickness. The SI unit is the mol/m ·s·Pa·mm. The test conditions (see 3.1) must be stated.
3.1.2 water vapor permeance—the ratio of a barrier’s WVTR to the vapor pressure difference between the two surfaces.
2
3.1.2.1 Discussion—An accepted unit of permeance is the metric perm, or 1 g/m per day per mm Hg. The SI unit is the
2
mol/m ·s·Pa. Since the permeance of a specimen is generally a function of relative humidity and temperature, the test conditions
must be stated.
3.1.3 water vapor transmission rate (WVTR)—the time rate of water vapor flow normal to the surfaces, under steady-state
conditions, per unit area.
2
3.1.3.1 Discussion—AnacceptedunitofWVTRisg/m perday.Thetestconditionsofrelativehumidityandtemperaturewhere
the humidity is the difference in relative humidity across the specimens, must be stated.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeF-2onFlexibleBarrierMaterialsandisthedirectresponsibilityofSubcommitteeF02.30onTestMethods.
Current edition approved July 27, 1990. Published September 1990. Originally published as F1249–89. Last previous edition F1249–89.F02 on Flexible Barrier Materials
and is the direct responsibility of Subcommittee F02.10 on Permeation.
Current edition approved June 22, 2006. Published June 2006. Originally approved in 1989. Last previous edition approved in 2005 as F 1249 – 05.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 10.01.volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
1
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