Designation:C679−15StandardTestMethodforTack-FreeTimeofElastomericSealants1ThisstandardisissuedunderthefixeddesignationC679;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversaprocedureforthedetermina-tionofthetack-freetimepropertyofsingle-andmulti-componentelastomericsealantscommonlyusedforsealing,caulking,andglazinginbuildingsandrelatedconstruction.1.2Thistestmethodisapplicabletoself-levelingandnon-saggradesofsealant.Sealantsrequiringslightheatingtofacilitateextrusionfromthecartridgeorgunarealsodescribedbythistestmethod.NOTE1—SeeSpecificationC920fortypeandgradedefinitions.1.3Thevaluesstatedinmetricunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareprovidedforinformationpurposesonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE2—Currently,thereisnoISOstandardsimilartothisspecifica-tion.2.ReferencedDocuments2.1ASTMStandards:2C717TerminologyofBuildingSealsandSealantsC920SpecificationforElastomericJointSealants3.Terminology3.1Definitions—SeeTerminologyC717fordefinitionsofthefollowingtermsusedinthistestmethod:caulking,compound,cure,elastomeric,glazing,non-sagsealant,sealant,self-levelingsealant,andstandardconditions.4.SummaryofTestMethod4.1Thetestconsistsoflightlytouchingasurfaceofacuringsealantwithapolyethylenefilmatregularintervalsuntilthesealantdoesnotattachitselftothefilmandthefilmappearscleanwhenpeeledfromthesurface.4.2Morespecificallyastripofpolyethylenefilmisplacedonthesurfaceofthecuringsealantanda30-g(1.06-oz)weightisplacedonthefilm.Theweight...
