Designation:C765−97(Reapproved2015)StandardTestMethodforLow-TemperatureFlexibilityofPreformedTapeSealants1ThisstandardisissuedunderthefixeddesignationC765;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversalaboratoryprocedurefortestingthelow-temperatureflexibilityofpreformedtapeseal-ants.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C717TerminologyofBuildingSealsandSealantsE145SpecificationforGravity-ConvectionandForced-VentilationOvens3.Terminology3.1Definitions—ThedefinitionsofthefollowingtermsusedinthistestmethodarefoundinTerminologyC717:preformedtapesealant,sealant.4.SummaryofTestMethod4.1Thepreformedtapesealanttobetestedisappliedtoanaluminumpanel.Theassemblyisheataged,thenplacedinthefreezerwherethepanelisquicklybentoveramandrel.Thespecimenisexaminedforcrackingandlossofadhesion.5.SignificanceandUse5.1Preformedtapesealantsaretacky,deformablesolidsthatareusedundercompressionbetweentwosubstratesinavarietyofsealingapplications.Thisprocedureisnotintendedtosimulateanactualusecondition,butitwillgivesomeindicationoftheflexibilityandadhesionofatapeatlowtemperature.Itcanservetodifferentiatebetweenflexibletapesthatcantakesomemovementandthosethattendtohardenorembrittleonagingandcrackorloseadhesionwhenflexedatlowtemperature.Itwillalsoaidinidentifyingsealantsthathavepoorflexibilitybecausetheyareoverextendedandcontainalowlevelofbinderaswellasthosesealantshavingbindersthatwillembrittleatlowtemperature.6.Apparatu...
