ASTM_E_2355_-_10.pdf

Designation:E235510Standard Test Method forMeasuring the Visible Light Transmission Uniformity of anAbsorptive Electrochromic Coating on a Glazing Surface1This standard is issued under the fixed designation E2355;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 The test described is a method for measuring theuniformity of an absorptive electrochromic coating(ECC)in astatic colored or bleached state on a glazing surface,which isor will be one of two or more glazings in a preassembledpermanently sealed insulating glass unit(IGU).1.2 The test method is applicable only for layered(one ormore active coatings between the TCOs)absorptive ECCs onvision glass(superstrate and substrate)areas planned for use inbuildings,such as glass doors,windows,skylights,and exteriorwall systems.The layers used for electrochromically changingthe optical properties may be inorganic or organic materialsbetween the superstrate and substrate and may include lami-nates.1.3 The test method is not applicable to other types ofcoatings on vision glass with other chromogenic coatings thatcannot be held in a static colored or bleached state.1.4 The test method is not applicable to IGUs that will beconstructed from superstrate or substrate materials other thanglass.1.5 The test method is not applicable for measuring theuniformity of ECC coatings during the coloring or bleachingprocesses.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 There is no comparable International Standards Organi-zation Standard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC1048 Specification for Heat-Strengthened and Fully Tem-pered Flat GlassE2141 Test Methods forAssessing the Durability ofAbsorp-tive Electrochromic Coatings on Sealed Insulating GlassUnitsE2188 Test Method for Insulating Glass Unit PerformanceE2189 Test Method for Testing Resistance to Fogging inInsulating Glass UnitsE2190 Specification for Insulating Glass Unit Performanceand EvaluationE2240 Test Method for Assessing the Current-Voltage Cy-cling Stability at 90C(194F)ofAbsorptive Electrochro-mic Coatings on Sealed Insulating Glass UnitsE2241 Test Method for Assessing the Current-Voltage Cy-cling Stability at Room Temperature of Absorptive Elec-trochromic Coatings on Sealed Insulating Glass Units3.Terminology3.1 DefinitionsRefer to Terminology C168 for definitionsof general terms.3.2 Definitions of Terms Specific to This Standard:3.2.1 bleached statea descriptor for an EC coating whenno ions reside in the electrochromic layer or after ions havebeen removed(or inserted,depending on the type of material)from the electrochromic layer(s)and if applicable,the maxi-mum number of ions have been returned to the counterelec-trode layer to restore the photopic optical specular transmit-tance in the bleached state(b)from that of the photopic opticalspecular transmittance in the colored state(c).3.2.2 colored statea descriptor for an EC coating afterions have been inserted(or removed,depending on the type ofmaterial)into the electrochromic layer and,if applicable,1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.22on Durability Performance of Building Constructions.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 2004.Last previous edition approved in 2004 as E235504.DOI:10.1520/E2355-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 removed from the counterelectrode layer to reduce the pho-topic optical specular transmittance(of wavelengths from 400nm to 730 nm)from that in the bleached state(b).3.2.3 durabilitythe capability of maintaining the service-ability of a product,component,assembly,or construction overa specified time.3.2.4 electrochromic coating(ECC)the multilayered ma-terials that include the electrochromic layers,other layers,andtransparent conducting oxide layers required for altering theoptical properties of the coating.3.2.5 electrochromic layer(s)the material(s)in an ECglazing that alter its optical properties in response to thei