Designation:F392/F392M−11(Reapproved2015)StandardPracticeforConditioningFlexibleBarrierMaterialsforFlexDurability1ThisstandardisissuedunderthefixeddesignationF392/F392M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversconditioningofflexiblebarriermaterialsforthedeterminationofflexresistance.Subsequenttestingcanbeperformedtodeterminetheeffectsofflexingonmaterialproperties.Thesetestsarebeyondthescopeofthispractice.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E171PracticeforConditioningandTestingFlexibleBarrierPackagingF2097GuideforDesignandEvaluationofPrimaryFlexiblePackagingforMedicalProducts3.Terminology3.1pinhole,n—asmallopeningofnon-specificshapeordimensionthatpassescompletelythroughalllayersofaflexiblematerial.3.1.1Discussion—Theuseoftheterm“pin”providestherelativesizereferenceasinasmallholemadewithorasifwithapin.4.SummaryofPractice4.1SpecimensofflexiblematerialsareflexedatstandardatmosphericconditionsdefinedinSpecificationE171,unlessotherwisespecified.Flexingconditionsandnumberandsever-ityofflexingstrokesvarywiththetypeofstructurebeingtested.Theflexingactionconsistsofatwistingmotionfollowed,inmostcases,byahorizontalmotion,thus,repeat-edlytwistingandcrushingthefilm.Thefrequencyisatarateof45cyclesperminute(cpm.)4.2Flexfailureisdete...
