ASTM_F_2622_-_08_2013.pdf

Designation:F262208(Reapproved 2013)Standard Test Method forOxygen Gas Transmission Rate Through Plastic Film andSheeting Using Various Sensors1This standard is issued under the fixed designation F2622;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a procedure for determinationof the steady-state rate of transmission of oxygen gas throughplastics in the form of film,sheeting,laminates,coextrusions,or plastic-coated papers or fabrics.It provides for the determi-nation of(1)oxygen gas transmission rate(O2GTR),(2)thepermeance of the film to oxygen gas(PO2),and(3)oxygenpermeability coefficient(PO2)in the case of homogeneousmaterials.1.2 This test method does not purport to be the only methodfor measurement of O2GTR.There may be other methods ofO2GTR determination that use other oxygen sensors andprocedures.1.3 This test method has intentionally been prepared toallow for the use of various sensors,devices,and procedures.The precision and bias of each design needs to be individuallyestablished to determine the applicability of that instrument ormethod to meet the needs of the user.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1898 Practice for Sampling of Plastics(Withdrawn 1998)3D3985 Test Method for Oxygen Gas Transmission RateThrough Plastic Film and Sheeting Using a CoulometricSensor3.Terminology3.1 Definitions:3.1.1 oxygen permeability coeffcient(PO2)the product ofthe permeance and the thickness of film.The permeability ismeaningful only for homogeneous materials,in which case it isa property characteristic of the bulk material.The oxygenpermeability coefficient should not be used,unless the relation-ship between thickness and permeance has been verified ontests using several different thicknesses of the material.The SIunit of oxygen permeability is the mol/(msPa).The testconditions(see 3.1.3)must be stated.3.1.2 oxygen permeance(PO2)the ratio of the O2GTR tothe difference between the partial pressure of O2on the twosides of the film.The SI unit of permeance is the mol/(m2sPa).The test conditions(see 15.1)must be stated.3.1.3 oxygen transmission rate(O2GTR)the quantity ofoxygen gas passing through a unit area of the parallel surfacesof a plastic film per unit time under the conditions of test.TheSI unit of transmission rate is the mol/(m2s).The testconditions,including temperature and oxygen partial pressureon both sides of the film must be stated.3.1.3.1 DiscussionAcommonly used unit of O2GTR is thecm3(STP)/m2d)at one atmosphere pressure difference where1 cm3(STP)is 44.62 mol,1 atm is 0.1013 MPa,and one dayis 86.4 103s.The O2GTR in SI units is obtained bymultiplying the value in inch-pound units by 5.160 10-10.4.Summary of Test Method4.1 The oxygen gas transmission rate is determined after thesample has equilibrated in a controlled test environment.Control of carrier gas flow rate(for concentration detectors),relative humidity,temperature,and oxygen concentration inboth the carrier gas and permeant(test)gas chambers iscritical.4.2 The specimen is mounted as a sealed semi-barrierbetween two chambers at ambient atmospheric pressure.Astream of nitrogen slowly purges one chamber and the otherchamber contains oxygen.As oxygen gas permeates through1This test method is under the jurisdiction ofASTM Committee F02 on FlexibleBarrier Packaging and is the direct responsibility of Subcommittee F02.10 onPermeation.Current edition approved Oct.1,2013.Published November 2013.Originallyapproved in 2008.Last previous edition approved in 2008 as F2622 08.DOI:10.1520/F2622-08R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the film into the nitrogen carrier gas,it is transported to thedetector where it produces a signal representing the oxygentransmission rate.5.Significance and Use5.1The O2GTR is an important determinant of the pack-aging protection afforded by barrier materials.It is not,however,the sole determinant,and additional tests,based onexperience,must be used to correla