Designation:C1257−15StandardTestMethodforAcceleratedWeatheringofSolvent-Release-TypeSealants1ThisstandardisissuedunderthefixeddesignationC1257;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodincludestwolaboratoryacceleratedexposureproceduresforpredictingtheeffectsofultravioletorultraviolet/visibleradiation,heat,andmoistureoncolor,chalking,cracking,andadhesionofsolvent-releasesealants.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4Thecommitteewithjurisdictionoverthisstandardisnotawareofanycomparablestandardspublishedbyotherorga-nizations.2.ReferencedDocuments2.1ASTMStandards:2C717TerminologyofBuildingSealsandSealantsC1442PracticeforConductingTestsonSealantsUsingArtificialWeatheringApparatusG113TerminologyRelatingtoNaturalandArtificialWeath-eringTestsofNonmetallicMaterialsG151PracticeforExposingNonmetallicMaterialsinAccel-eratedTestDevicesthatUseLaboratoryLightSourcesG154PracticeforOperatingFluorescentUltraviolet(UV)LampApparatusforExposureofNonmetallicMaterialsG155PracticeforOperatingXenonArcLightApparatusforExposureofNon-MetallicMaterials3.Terminology3.1Definitions:3.1.1RefertoTerminologyC717andG113fordefinitionsoftermsusedinthistestmethod:standardconditions.4.SummaryofTestMethod4.1FourtestspecimensarepreparedinU-shapedaluminumchannels.Aftercuring,threeofthespecimensareexposedinthelaboratoryacceleratedweatheringdeviceandthefourthspecimenisstoredunderstandardconditionsasanunexposedfilespecimen.Attheendoftheexposureperiod,thespecimensaree...
