Designation:D2838−09´1StandardTestMethodforShrinkTensionandOrientationReleaseStressofPlasticFilmandThinSheeting1ThisstandardisissuedunderthefixeddesignationD2838;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditoriallycorrectedNote1inAugust2015.1.Scope*1.1Thistestmethodcoversthedeterminationoftheshrinktensionandrelatedcharacteristics,thatis,shrinkforceandorientationreleasestress,ofheat-shrinkableplasticfilmandsheetingoflessthan1.0mm(0.04in.)thickness.Twoproceduresaredescribedthatpermitthemeasurementofshrinkforcesatpredeterminedtemperatures.Theyareasfollows:1.1.1ProcedureAisdesignedtomeasurethemaximumforceexertedbyaspecimenthatistotallyrestrainedfromshrinkingasitisheatedrapidlytoaspecifictemperature.1.1.2ProcedureBisdesignedtomeasurethemaximumforceexertedbyaspecimenthatispermittedtoshrinkapredeterminedamountpriortorestraintwhilebeingheatedrapidlytoaspecifictemperature.1.2OrientationreleasestresscanbedeterminedfromthedataobtainedusingProcedureA.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—Filmhasbeenarbitrarilydefinedassheetinghavingnominalthicknessnotgreaterthan0.25mm(0.010in.).NOTE2—ThereisnoknownISOequivalenttothistestmethod.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD4000ClassificationSystemforSpecifyingPlasticMateri-alsD5947TestMethodsforPhysicalDimensionsofSolidPlasticsSpecimensD6287PracticeforCuttingFilmandSheetingTestSpeci-mensD6988GuideforDeterminationofThicknessofP...
