Designation:C1249−18StandardGuideforSecondarySealforSealedInsulatingGlassUnitsforStructuralSealantGlazingApplications1ThisstandardisissuedunderthefixeddesignationC1249;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversdesignandfabricationconsiderationsfortheedgesealofconventionallysealedinsulatingglassunits,hereinreferredtoasIGunits.TheIGunitsdescribedareusedinstructuralsiliconesealantglazingsystems,hereinreferredtoasSSGsystems.SSGsystemstypicallyareeithertwoorfoursided,glazedwithastructuralsealant.Otherconditionssuchasone,three,five,sixsidedmaybeused.1.2ThisguidesdoesnotcovertheIGunitsofotherthanconventionaledgesealdesign(Fig.1);however,theinforma-tioncontainedhereinmaybeofbenefittothedesignersofsuchIGunits.1.3InanSSGsystem,IGunitsareretainedtoametalframingsystembyastructuralseal(Fig.2).Thesizeandshapeofthatseal,aswellasnumerousotherSSGsystemdesignconsiderations,arenotaddressedinthisguide.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thecommitteewithjurisdictionforthisstandardisnotawareofanycomparablestandardguidespublishedbyotherorganizations.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C639TestMethodforRheological(Flow)PropertiesofElastomericSea...
