Designation:F2749−15StandardTestMethodforDeterminingtheEffectsofCreasingaMembraneSwitchorPrintedElectronicDevice1ThisstandardisissuedunderthefixeddesignationF2749;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodestablishesamethodforthecreasingofanypartofamembraneswitchorprintedelectronicdevicewithconductivecircuits.1.1.1ThevaluesgiveninSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1crease—aridgeorgroovemadebyfoldingandpress-ing.2.1.1.1Discussion—Thefoldmarkinthesubstratewillbecausedbyarollerrolledoverafoldthatwilllikelyremaininthesubstrateaftertesting.2.1.2creasecycle—a180degreecreasefollowedbyastraighteningofthecrease(seeFig.1).2.1.3membraneswitch—amomentaryswitchingdeviceinwhichatleastonecontactison,ormadeof,aflexiblesubstrate.2.1.4membraneswitchtail—aflexibleportionofamem-braneswitchusedforinput/outputconnection.3.SignificanceandUse3.1Creasingofmembraneswitches,printedelectronicdevice,ortheircomponentscanaffecttheirvisualappearance,mechanicalintegrityorelectricalfunctionality.Thispracticesimulatesconditionsthatmaybeseenduringmanufacture,installationoruse.3.2Creasetestingmaybedestructive,thereforeanysamplestestedshouldbeconsideredunfitforfutureuse.3.3Specificareasoftestinginclude,butarenotlimitedto:3.3.1Membraneswitchflextailsorprintedelectronicdevice,and3.3.2Anycomponentofamembraneswitchorprintedelectronicdevicethatmaybesubjectedtocreasing.4.Interferences4.1Thefollowingparametersmayaffecttheresultsofthistest:4.1.1tempe...
