Designation:C771−14StandardTestMethodforWeightLossAfterHeatAgingofPreformedTapeSealants1ThisstandardisissuedunderthefixeddesignationC771;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversalaboratoryprocedurefordeterminingtheweightlossafterheatagingofpreformedtapesealants.NOTE1—TestMethodC681describesaweightlossorvolatilitytestforknife-gradeglazingcompounds.1.2Thevaluesstatedinacceptablemetricunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3ThesubcommitteewithjurisdictionisnotawareofanysimilarISOstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C681TestMethodforVolatilityofOil-andResin-Based,Knife-Grade,ChannelGlazingCompoundsC717TerminologyofBuildingSealsandSealantsE145SpecificationforGravity-ConvectionandForced-VentilationOvens3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,seeTerminologyC717.4.SummaryofTestMethod4.1Thepreformedtapesealanttobetestedisplacedonataredmetalplateandweighed.Afterheataging,thespecimenisweighedagain.Thedifferenceinweightindicatesthevolatilecontentofthetapesealant.5.SignificanceandUse5.1Preformedtapesealantsaretacky,deformablesolidsthatareusedundercompressionbetweentwosubstratesinavarietyofsealingapplications.Comparedtoothertypesofsealants,thatis,gunnablesealantsandcaulks,sealingtapesaredesignedtobeessentially100%solidsmaterials.Inuse,thesetapesareintendedtogivelongservicewithminimalweightlossorvolatility.Thisprocedurewillgiveameasureoftheweightlossofapreformedtapesealantafteracontrolledperiodofexposureatanel...
