Designation:C542−05(Reapproved2017)StandardSpecificationforLock-StripGaskets1ThisstandardisissuedunderthefixeddesignationC542;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationdefinestherequiredpropertiesoflock-stripgasketswhereresistancetosunlight,weathering,flame,oxidation,permanentdeformationunderload,anddiminutionofgrippingpressureareprimeessentials.NOTE1—Therequirementofflamepropagationmaybewaivedbythearchitectorprofessionalengineerwhendoingsodoesnotconflictwithlocalcodesorordinances.1.2Thisspecificationappliesonlytothe“locking”com-pressiontypeofgasket,sometimesreferredtoasthe“zipper”type.NOTE2—Structuralintegrityandweather-tightnessofthewallrequiresthesounddesignandinstallationoftheentiresystemofwhichthegasketisonlyonecomponent.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4TestMethodC1166,asreferencedinthisspecification,shouldbeusedtomeasureanddescribethepropertiesofmaterials,products,orassembliesinresponsetoheatandflameundercontrolledlaboratoryconditionsandshouldnotbeusedtodescribeorappraisethefirehazardorfireriskofmaterials,products,orassembliesunderactualfireconditions.However,resultsofthistestmaybeusedaselementsofafireriskassessmentwhichtakesintoaccountallofthefactorswhicharepertinenttoanassessmentofthefirehazardofaparticularenduse.1.5Thefollowingprecautionarycaveatpertainsonlytothetestmethodportion,Section7,ofthisspecification:Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.1.6Thecommitteewithjurisdictionoverthisstandardisnotawareofanycomparablestanda...
