ASTM F2476-20

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: F2476 − 20
Standard Test Method for
the Determination of Carbon Dioxide Gas Transmission Rate
(CO TR) Through Barrier Materials Using an Infrared
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Detector
This standard is issued under the fixed designation F2476; 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 3. Terminology
1.1 Thismethodcoversaprocedurefordeterminationofthe 3.1 Definitions:
steady-state rate of transmission of carbon dioxide gas through 3.1.1 carbon dioxide permeability coeffıcient (P’CO )—the
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plastics in the form of film, sheeting, laminates, coextrusions, product of the permeance and the thickness of film. The
or plastic-coated papers or fabrics. It provides for the determi- permeabilityismeaningfulonlyforhomogeneousmaterials,in
nation of (1) carbon dioxide gas transmission rate (CO TR), which case it is a property characteristic of the bulk material.
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(2) the permeance of the film to carbon dioxide gas (PCO ), This quantity should not be used unless the relationship
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and (3) carbon dioxide permeability coefficient (P’CO)inthe between thickness and permeance has been verified on tests
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case of homogeneous materials. using several different thicknesses of the material. The SI unit
of carbon dioxide permeability is the mol/(m·s·Pa). The test
1.2 This standard does not purport to address all of the
conditions (see 3.1.3) must be stated.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1.2 carbon dioxide permeance (PCO )—the ratio of the
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priate safety, health, and environmental practices and deter- CO TR to the difference between the partial pressure of CO
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mine the applicability of regulatory limitations prior to use. on the two sides of the film. The SI unit of permeance is the
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1.3 This international standard was developed in accor- mol/(m ·s·Pa). The test conditions (see 3.1.3) must be stated.
dance with internationally recognized principles on standard-
3.1.3 carbon dioxide transmission rate(CO TR)—thequan-
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ization established in the Decision on Principles for the
tity of carbon dioxide gas passing through a unit area of the
Development of International Standards, Guides and Recom-
parallel surfaces of a plastic film per unit time under the
mendations issued by the World Trade Organization Technical
conditions of the test. The SI unit of transmission rate is the
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Barriers to Trade (TBT) Committee.
mol/(m ·s). The test conditions, including temperature and
carbon dioxide partial pressure on both sides of the film, must
2. Referenced Documents
be stated.
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2.1 ASTM Standards:
3.1.3.1 Discussion—A commonly used metric unit of
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E177 Practice for Use of the Terms Precision and Bias in
CO TR is the cc(STP)/(m ·day) at one atmosphere driving
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ASTM Test Methods
force pressure differential where: 1 cc(STP) is 44.62 µmol, 1
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E691 Practice for Conducting an Interlaboratory Study to
atm is 0.1013 MPa, and one day is 86.4 × 10 s. CO TR in SI
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Determine the Precision of a Test Method
units is obtained by multiplying the value in metric units by
-10 3
5.164×10 orthevalueininch-poundunitscm (STP) ⁄ (100
2 -9
in. · day) by 8.004 × 10 .
4. Summary of Test Method
4.1 The carbon dioxide gas transmission rate is determined
after the sample has equilibrated in a dry-test environment. In
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This test method is under jurisdiction of ASTM Committee F02 on Primary
this context, a “dry” environment is considered to be one in
Barrier Packaging and is the direct responsibility of Subcommittee F02.10 on
Permeation.
which the relative humidity is less than 1 %.
CurrenteditionapprovedJune1,2020.PublishedJuly2020.Originallyapproved
4.2 The specimen is mounted as a sealed semi-barrier
in 2005. Last previous edition approved in 2013 as F2476 – 13. DOI: 10.1520/
F2476-20.
between two chambers at ambient atmospheric pressure. One
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
chamberisslowlypurgedbyastreamofnitrogenandtheother
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
chamberwithcarbondioxide.Ascarbondioxidegaspermeates
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. through the film into the nitrogen carrier gas, it is transported
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