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What is the standard method for measuring gas permeability of plastic film?
August 9, 2008
Roseliza has asked, "What is the standard method for measuring gas permeability of plastic film?"
Well this is fairly straightforward as there are several “standard” test methods for this. Also, when the permeability is “Gas”, in packaging this usually means Oxygen. In the United States, and many other locations there is ASTM D-3985 for Oxygen and F 1249 for Moisture and ASTM F-1769(97) for Aroma or chemical barrier, but F-1769(97) has been withdrawn as an active standard and not replaced.
For more general gas permeability there is ASTM D1434 - 82(2003) “Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting”
Some general comments about the test from the summary in the standard are:
"These measurements give semiquantitative estimates for the gas transmission of single pure gases through film and sheeting. Correlation of measured values with any given use, such as packaged contents protection, must be determined by experience. The gas transmission rate is affected by conditions not specifically provided for in these tests, such as moisture content (Note 2), plasticizer content, and nonhomogeneities. These tests do not include any provision for testing seals that may be involved in packaging applications.
Note 2—The tests are run using gas with 0 % moisture changes.
Interlaboratory testing has revealed that permeances measured by these procedures exhibit a strong dependence on the procedure being used, as well as on the laboratory performing the testing. Agreement with other methods is sometimes poor and may be material-dependent. The materials being tested often affect the between-laboratory precision. The causes of these variations are not known at this time. It is suggested that this method not be used for referee purposes unless purchaser and seller can both establish that they are measuring the same quantity to a mutually agreed upon level of precision.”
You can review and purchase the standards from www.ASTM.org
Posted by Eldridge M. Mount on August 9, 2008 | Comments (1)
In response to: What is the standard method for measuring gas permeability of plastic film?
Mariana Ramirez commented:
I would like to know if there are reference materials or standards of known gas (O2, CO2, N2) permeabilities, commercially available? Thanks you.