Designation:D2732−14StandardTestMethodforUnrestrainedLinearThermalShrinkageofPlasticFilmandSheeting1ThisstandardisissuedunderthefixeddesignationD2732;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversdeterminationofthedegreeofunrestrainedlinearthermalshrinkageatgivenspecimentem-peraturesofplasticfilmandsheetingof0.76mm(0.030in.)thicknessorless.Thistestmethoddoesnotcovershrinkagefromlossofsolventinsomematerials.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinforma-tiononlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThisstandardandISO11501addressthesamesubjectmatter,butdifferintechnicalcontent.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1204TestMethodforLinearDimensionalChangesofNonrigidThermoplasticSheetingorFilmatElevatedTemperatureE2251SpecificationforLiquid-in-GlassASTMThermom-eterswithLow-HazardPrecisionLiquids2.2ISOStandard:3ISO11501DeterminationofDimensionalChangeonHeat-ing3.Terminology3.1Definitions:3.1.1unrestrainedlinearthermalshrinkage(freeshrinkorshrinkage)—theirreversibleandrapidreductioninlineardimensioninaspecifieddirectionoccurringinfilmsubjectedtoelevatedtemperaturesunderconditionswherenilornegli-giblerestrainttoinhibitshrinkageispresent.Itisnormallyexpressedasapercentageoftheoriginaldimension.4.SignificanceandUse4.1Asaresultofthemanufacturingproce...
