Designation:F3290−17StandardGuideforHandlingandApplicationofaMembraneSwitchorPrintedElectronicDevicetoitsFinalSupportStructure1ThisstandardisissuedunderthefixeddesignationF3290;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversproperhandlingandapplicationofaflexiblecircuitmembraneswitch,orprintedelectronicassem-blytoitsfinalsupportstructuretoavoidmechanicalorelectricalfailure.1.2Damageofinternaltactiledevicesorsurfacemountdevice(SMD)componentscanoccurwithexcessiveflexingorbendingduringlamination,repositioning,fromunevensupportsurface,airentrapment,orpressingkeyswhenunsupported.1.3Designconsiderationsandmaterialselectioncanimpactthemembraneswitchortheprintedelectronicdevice’sabilitytoendurethemechanicalstressthatcanoccurinhandling,applicationanduse.Theseshouldbeconsideredasearlyaspossibleinthedesignphase.1.4Recentadvancementsinprintedelectronicpolymermaterialshaveshownincreasedreliabilityfromflexingandcreasing,replacingcopperflexcircuitsinmanycases.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2F2749TestMethodforDeterminingtheEffectsofCreasingaMembraneSwitchorPrintedElectronicDeviceF2750TestMethodforDeterminingtheEffectsofBendingaMembraneSwitchorPrintedElectronicDeviceF3147TestMethodforEvaluatingtheReliabilityofSurfaceMountedDevice(SMD)JointsonaFlexibleCircuitbyaRollingMandrelBend3.Terminology3.1Definitions:3.1.1membraneswitch(MS),n—amomentaryswitchingdeviceinwhichatleastonecontactison,ormadeof,aflexiblesubstrate.3.1.2printedelectronicdevice(PED),n—electrically...
