Designation:D2739−97(Reapproved2010)StandardTestMethodforVolumeResistivityofConductiveAdhesives1ThisstandardisissuedunderthefixeddesignationD2739;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthevolumeresistivityofresin-basedconductiveadhesivesinthecuredcondition.Thetestismadeonathinadhesivelayeraspreparedinabondedspecimen.Thistestmethodisusedforconductiveadhesivesthatarecuredeitheratroomtemperatureoratelevatedtemperatures.1.2ThevaluesstatedineitherSIorotherunitsshallberegardedseparatelyasstandard.SIequivalentstoscrewthreadsareshowninthefigures.1.3Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD907TerminologyofAdhesives2.2FederalSpecification:QQ-B-626Composition2232.3ASTMAdjuncts:AssemblyJig43.Terminology3.1Definitions:3.1.1ManytermsinthistestmethodaredefinedinTermi-nologyD907.3.1.2conductivity,n—theratioofthecurrentdensitycarriedthroughaspecimentothepotentialgradientparallelingthecurrent.Thisisnumericallyequaltotheconductancebetweenoppositefacesofaunitcubeofliquid.Itisthereciprocalofresistivity.D2864,D273.1.3resistivity,volume,n—theratiooftheelectricpotentialgradienttothecurrentdensitywhenthegradientisparalleltothecurrentinthematerial.D1566,D114.SummaryofTestMethod4.1Thevolumeresistivityofadhesivelayerscuredbetweenmetaladherendsismeasuredonaresistancebridge.Tensileadhesionplugs(Fig.1)5aredescribedinthistestmethod.Anyothertestspecimensandmaterialscanbeusedaslongassimilarprecautions(seeSection7)areobservedregardingpreparationandtolerances.5.Si...
