Designation:D4272/D4272M−15StandardTestMethodforTotalEnergyImpactofPlasticFilmsbyDartDrop1ThisstandardisissuedunderthefixeddesignationD4272/D4272M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethoddescribesthedeterminationofthetotalenergyimpactofplasticfilmsbymeasuringthekineticenergylostbyafree-fallingdartthatpassesthroughthefilm.1.2Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—Filmhasbeenarbitrarilydefinedassheetinghavingnominalthicknessnotgreaterthan0.25mm[0.010in.].NOTE2—ThistestmethodandISO7765–2addressthesamesubjectmatter,butdifferintechnicalcontent(andresultscannotbedirectlycomparedbetweenthetwotestmethods).TheISOtestmethodcallsforadirectreadoutofenergybyusingaloadcellaspartoftheimpactorhead,whileTestMethodD4272callsforaconstantweightimpactor,thenmeasuringthetimeoftravelthroughagivendistancetogetenergyvalues.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1709TestMethodsforImpactResistanceofPlasticFilmbytheFree-FallingDartMethodD3420TestMethodforPendulumImpactResistanceofPlasticFilmD6988GuideforDeterminationofThicknessofPlasticFilmTestSpecimensE171PracticeforConditioningandTestingFlexibleBarrierPackagingE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ISOSt...
