D1709-04 用自由落镖法测试塑料薄膜抗冲击性的标准试验方法

Designation:D1709–04StandardTestMethodsforImpactResistanceofPlasticFilmbytheFree-FallingDartMethod1ThisstandardisissuedunderthefixeddesignationD1709;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thesetestmethodscoverthedeterminationoftheenergythatcausesplasticfilmtofailunderspecifiedconditionsofimpactofafree-fallingdart.Thisenergyisexpressedintermsoftheweight(mass)ofthemissilefallingfromaspecifiedheightwhichwouldresultin50%failureofspeci-menstested.1.2Twotestmethodsaredescribed:1.2.1TestMethodAemploysadartwitha38.1060.13-mm[1.50060.005-in.]diameterhemisphericalheaddroppedfromaheightof0.6660.01m[26.060.4in.].Thistestmethodmaybeusedforfilmswhoseimpactresistancesrequiremassesofabout50gorlesstoabout2kgtofracturethem.1.2.2TestMethodBemploysadartwitha50.8060.13-mm[2.00060.005-in.]diameterhemisphericalheaddroppedfromaheightof1.5060.03m[60.0+0.25,−1.70in.].Itsrangeofapplicabilityisfromabout0.3kgtoabout2kg.1.3Twotestingtechniquesaredescribed:1.3.1Thestandardtechniqueisthestaircasemethod.Bythistechnique,auniformmissileweightincrementisemployedduringtestandthemissileweightisdecreasedorincreasedbytheuniformincrementaftertestofeachspecimen,dependingupontheresult(failornotfail)observedforthespecimen.1.3.2Thealternativetechniqueprovidesfortestingspeci-mensinsuccessivegroupsoften.Onemissileweightisemployedforeachgroupandmissileweightisvariedinuniformincrementsfromgrouptogroup.1.3.3Thestaircasetechniqueandthealternativetechniquegiveequivalentresultsbothastothevaluesofimpactfailureweightwhichareobtainedandastotheprecisionswithwhichtheyaredetermined.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesstatedinparenthesesareforinformationonly.NOTE1—Testsonmaterialsthatdonotbreak,foranyreason,arenotconsideredtobevalid.Ithasbeennotedthatcertainmaterialsmaystretchsofarastobottomoutatthebaseofcertaintestinstrumentswithoutactuallyrupturing.SubcommitteeD20.19iscurrentlyconsideringmeth-odsfortestingthesematerials.AnyoneinterestedinparticipatinginaTaskGroupshouldcontacttheChairmanofSubcommitteeD20.19throughASTMInternationalHeadquarters.NOTE2—ThistestmethodistechnicallyequivalenttoISO7765-1:1988,withtheexceptionofalargertoleranceonthedropheightinTestMethodB.Also,theISOmethoddoesnotallowthealternativetestingtechniquedescribedinSection11ofthistestmethod.1.5Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D374TestMethodsforThicknessofSolidElectricalInsu-lationD618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1248SpecificationforPolyethylenePlasticsExtrusionMaterialsforWireandCableD3420TestMethodforDynamicBallBurst(Pendulum)ImpactResistanceofPlasticFilmD4272TestMethodforTotalEnergyImpactofPlasticFilmsbyDartDropE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ISOStandard:ISO7765:1988PlasticFilmandSheeting—DeterminationofImpactResistancebytheFreeFallingDartMethod—Part1:StaircaseMethod33.Terminology3.1Definitions—Fordefinitionsrelatedtoplastics,seeTerminologyD883.1ThesetestmethodsareunderthejurisdictionofASTMCommitteeD20onPlasticsandarethedirectresponsibilityofSubcommitteeD20.19onFilmandSheeting.CurrenteditionapprovedOctober1,2004.PublishedOctober2004.Originallyapprovedin1959.Lastpreviouseditionapprovedin2003asD1709–03.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3AvailablefromAmericanNationalStandardsInstitute(ANSI),25W.43rdSt.,4thFloor,NewYork,NY10036.1*ASummaryofChangessectionappearsattheendofthisstandard.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1failure—anybreakthroughthefilmthatcanbeob-servedreadilybyfeelingorbyviewingthespecimenunderbacklightedcondition.3.2.2impactfailureweight—thatmissileweight,estimatedstatistically,atwhich50%ofthespecimenswouldfailinthespecifiedtest.3.2.3missileweight—theweight(mass)ofthedartplusthetotalvalueofincrementalweightsattachedplusthelockingcollar.4.SignificanceandUse4.1TestMethodsAandBareusedtoestablishtheweightofthedartwhen50%ofthespecimensfailundertheconditionsspecified.Dataobtainedbyonetestmethodcannotbecom-pareddirectlywiththeothertestmethodnorwiththoseobtainedfromtestsemployingdifferentconditionsofmissilevelocity,impingingsurfacediameter,effectivespecimendiam-eter,andthickness.Thevaluesobtainedbythesetestvariablesarehighlydependentonthemethodoffilmfabrication.4.2Theresultsobtainedby