Designation:E2240–06StandardTestMethodforAssessingtheCurrent-VoltageCyclingStabilityat90°C(194°F)ofAbsorptiveElectrochromicCoatingsonSealedInsulatingGlassUnits1ThisstandardisissuedunderthefixeddesignationE2240;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheacceleratedagingandmonitoringofthetime-dependentperformanceofelectrochro-micwindows(ECW).Crosssectionsoftypicalelectrochromicwindowshavethreetofive-layersofcoatingsthatincludeonetothreeactivelayerssandwichedbetweentwotransparentconductingelectrodes(TCEs,seeSection3).Examplesofthecross-sectionalarrangementscanbefoundin“EvaluationCriteriaandTestMethodsforElectrochromicWindows.”2(Foracronymsusedinthisstandard,seeAppendixX1,sectionX1.1).1.2Thistestmethodisapplicableonlyforlayered(oneormoreactivecoatingsbetweentheTCEs)absorptiveelectro-chromiccoatingsonsealedinsulatingglass(IG)unitsfabri-catedforvisionglass(superstrateandsubstrate)areasforuseinbuildings,suchasglassdoors,windows,skylights,andexteriorwallsystems.Thelayersusedforelectrochromicallychangingtheopticalpropertiesmaybeinorganicororganicmaterialsbetweenthesuperstrateandsubstrate.1.3Theelectrochromiccoatingsusedinthistestmethodwillbesubsequentlyexposed(seeTestMethodsE2141)tosolarradiationanddeployedtocontroltheamountofradiationbyabsorptionandreflectionandthus,limitthesolarheatgainandamountofsolarradiationthatistransmittedintothebuilding.1.4Thistestmethodisnotapplicabletootherchromogenicdevices,forexample,photochromicandthermochromicde-vices.1.5Thistestmethodisnotapplicabletoelectrochromicwindowsthatareconstructedfromsuperstrateorsubstratematerialsotherthanglass.1.6Thistestmethodreferencedhereinisalaboratorytestconductedunderspecifiedconditions.Thistestisintendedtosimulateand,possibly,toalsoaccelerateactualin-serviceus...
