Designation:D2559−12a´1StandardSpecificationforAdhesivesforBondedStructuralWoodProductsforUseUnderExteriorExposureConditions1ThisstandardisissuedunderthefixeddesignationD2559;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—Paragraph1.4wascorrectededitoriallyinFebruary2016.INTRODUCTIONThisspecification,whichwasinitiallyapprovedin1966,wasdevelopedtoensurethatadhesivesdevelopedandusedinstructuralgluedlaminatedtimber(glulam)areconsideredsuitablefortheintendedapplication.Thiswouldinclude,asamaximumlevelofseverityinthecaseofmoistureeffects,fullandcontinuousexposuretotheweather.TheuseofadhesivesforstructuralwoodproductshasexpandedbeyondGlulamtoincludeproductssuchasStructuralCompositeLumber,woodI-Joistsandvariouscompositesadhesivelybondedusingavarietyofmaterials.Althoughmoststructuralgluedwoodproductshavetraditionallyspecifiedanadhesivesuitableforexteriorexposure,theactualexposureofgluedwoodproductstoexteriorconditionsmayrangefromexposuretotheweatherforbriefperiodsoftime,tocontinuousexposuretoamarineenvironment.Adistinctionbetweenadhesivecertificationandproductperformancerequirementsisnecessarytoensurethebroadestpossibleacceptanceofadhesivesystems.1.Scope*1.1Thisspecificationcoversadhesivessuitableforthebondingofwood,includingtreatedwood,intostructuralwoodproductsforgeneralconstructionorotheruseswhereahigh-strength,durableadhesivebondisrequired.1.2Thisspecificationincludestestmethodsthatmaybereferencedbyspecificproductstandardsfortheevaluationandapprovalofstructuralwoodadhesives.Methodsareincludedtoevaluateadhesivesintendedforuseinexteriorexposure.NOTE1—ConsulttheCommentaryinAppendixX1regardingtheintentandlimitationsofeachtestmethodcontainedinthisspecification.1.3DescriptionofBondlin...
