1、Designation:F130714Standard Test Method forOxygen Transmission Rate Through Dry Packages Using aCoulometric Sensor1This standard is issued under the fixed designation F1307;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、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 the determina-tion of the steady-state rate of transmission of oxygen gas intopacka
3、ges.More specifically,the method is applicable topackages that in normal use will enclose a dry environment.1.2 The values stated in SI units are to be regarded as thestandard.1.3This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibilit
4、y 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:2D1434 Test Method for Determining Gas Permeability Char-acteristics of Plastic Film and SheetingD1898
5、 Practice for Sampling of Plastics(Withdrawn 1998)3D3985 Test Method for Oxygen Gas Transmission RateThrough Plastic Film and Sheeting Using a CoulometricSensorE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions of Terms Specif
6、ic to This Standard:3.1.1 oxygen gas transmission rate(O2GTR)as applied toa package,is the quantity of oxygen gas passing through thesurface of the package(PKG)per unit of time.3.1.1.1 DiscussionThe SI unit of transmission rate is themol/s.The test conditions,including temperature,oxygenpartial pres
7、sure and humidity on both sides of the package,must be stated.A commonly used unit of O2GTR is thecm3(STP)/(PKGd),where 1 cm3at Standard Temperature andPressure(STP=273.15K;1.013 105Pa)is 44.62 106moland one day is 86 400 s.3.1.2 oxygen permeability coeffcient(PO2)the product ofthe permeance and thi
8、ckness of the barrier.3.1.2.1 DiscussionThe permeability is meaningful onlyfor homogenous materials,in which case it is a propertycharacteristic of the bulk material.This quantity should not beused unless the relationship between thickness and permeancehas been verified in tests using several thickn
9、esses of thematerial.The SI unit of permeability is the mol/(msPa).Thetest conditions must be stated.3.1.3 oxygen permeance(PO2)the ratio of the O2GTR tothe difference between the partial pressure of O2on the twosides of the package wall.3.1.3.1 DiscussionThe SI unit of permeance is the mol/(sPa).Th
10、e test conditions(see 4.2)must be stated.4.Summary of Test Method4.1 This test method employs a coulometric oxygen sensorand associated equipment in an arrangement similar to thatdescribed in Test Method D3985.Oxygen gas transmission rate(O2GTR)is determined after the package has been mounted ona te
11、st fixture and has equilibrated in the test environment.4.2 The package is mounted in such a way as to provide thatthe inside of the package is slowly purged by a stream ofnitrogen while the outside of the package is exposed to aknown concentration of oxygen.The package may be exposedin ambient room
12、 air which contains 20.8%oxygen,or im-mersed in an atmosphere of 100%oxygen.As oxygen perme-ates through the package walls into the nitrogen carrier gas,itis transported to the coulometric detector where it produces anelectrical current,the magnitude of which is proportional to theamount of oxygen f
13、lowing into the detector per unit of time.5.Significance and Use5.1 Oxygen gas transmission rate is an important determi-nant of the protection afforded by barrier materials.It is not,however,the sole determinant,and additional tests,based on1This test method is under the jurisdiction ofASTM Committ
14、ee F02 on FlexibleBarrier Packaging and is the direct responsibility of Subcommittee F02.10 onPermeation.Current edition approved April 1,2014.Published June 2014.Originallyapproved in 1990.Last previous edition approved in 2007 as F1307 02(2007).DOI:10.1520/F1307-14.2For referenced ASTM standards,v
15、isit 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
16、 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 experience,must be used to correlate package performancewith O2GTR.This test method is suitable as a referee methodof testing,provided that the user and source have agreed onsamplingprocedures,standardizationprocedures,testconditions,and acceptance criteria.6.Interferences6.1 The presence of certain interfering substances in thecarrier gas stream may give rise to unwanted electrical outputsand error f
