Designation:F1843−15StandardPracticeforSamplePreparationofPlasticFilmsusedonMembraneSwitchOverlaysforSpecularGlossMeasurements1ThisstandardisissuedunderthefixeddesignationF1843;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthemethodofsamplepreparation,priortotakingglossmeasurementsonamembraneswitchoverlay.1.2Typicalapplicationsincludewindowdisplayareasonagraphicoverlay,andsurfacetexture.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D523TestMethodforSpecularGloss3.Terminology3.1Definitions:3.1.1membraneswitch,n—amomentaryswitchingdeviceinwhichatleastonecontactison(ormadeof)aflexiblesubstrate.3.1.2speculargloss,n—thedegreetowhichasurfacesimulatesaperfectmirrorinitscapacitytoreflectincidentlight.3.1.3overlay,n—theouterlayerofamembraneswitchonwhichthegraphicsareprinted.4.SummaryofPractice4.1Awateroralcoholdropletisplacedonablackmetalplate.Thespecimentobemeasuredispresseddownoverthedroplet.Capillaryactioncausesintimatecontactbetweenspecimenandplate,therebyeliminatingsecondsurfacereflec-tion.GlossreadingsmaythenbetakeninaccordancewithTestMethodD523.5.SignificanceandUse5.1Glossmeasurementsareusedtoqualifyarawmaterialorfinishedproduct.5.2Samplepreparationwilleffecttheoutcomeofglossreadings.Thispracticewilleliminatesecondsurfacereflection,andallowamoreaccurateglossreadingofthesubstrate.5.3Materialswhichrequirethispreparationincludethefollowing:clearortranslucentsubstrates,coloredtransparentsubstrates,andareasprintedwithclear,translucent,ortrans-parentcoloredcoatings.6.Apparatus6.1GlossMeter,inaccordance...
