Designation:C792−15StandardTestMethodforEffectsofHeatAgingonWeightLoss,Cracking,andChalkingofElastomericSealants1ThisstandardisissuedunderthefixeddesignationC792;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversalaboratoryprocedurefordeterminingtheeffectsofheatagingonweightloss,cracking,andchalkingofcured-in-placeelastomericjointsealants(single-andmulticomponent)foruseinbuildingconstruction.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.3ThereisnoknownISOequivalenttothistestmethod.2.ReferencedDocuments2.1ASTMStandards:2C717TerminologyofBuildingSealsandSealants3.Terminology3.1Definitions—SeeTerminologyC717fordefinitionsofthefollowingtermsusedinthistestmethod:compound,elastomeric,non-sagsealant,sealant,andself-levelingsealant.4.SummaryofTestMethod4.1Threesealantspecimensarespreadonthinaluminumplatesand,afterdeterminingnetweightsofsealant,arecuredfor7daysatStandardConditions.Immediatelyfollowingthisinitialcuretimetwospecimensareexposedinaforced-draftovenmaintainedat7062°C(15863.6°F)for21days.Attheendofthisexposurethepercentageweightlossofthesealantisdeterminedandexaminationismadeforpresenceofcracksandchalking.5.SignificanceandUse5.1Weightlossthroughvolatilizationofcomponentsofasealantinabuildingjointmayaffectsealantappearancebecauseofshrinkageandsealantperformancebecauseofthelossoffunctionalsealantcomponents.Exposuretohigh-temperatureenvironmentswillacceleratethelossofvolatiles.5.2Thistestmethodmeasuresweightloss.Itcanbeusedincombinationwithaknowledgeofsealantdensi...
