ASTM E2355-04
(Test Method)Standard Test Method for Measuring the Uniformity of an Absorptive Electrochromic Coating on a Glazing Surface
Standard Test Method for Measuring the Uniformity of an Absorptive Electrochromic Coating on a Glazing Surface
SIGNIFICANCE AND USE
The useful life of IGUs with an absorptive ECC may depend on their ability to maintain an acceptable uniformity when used in an IGU for buildings applications. As described in Section 1.22 ,4 (See Appendix X1, Sections X1.4 and X1.5), this test method is intended to provide a means for measuring the uniformity of an absorptive electrochromic coating (ECC) on a glazing surface, which will ultimately be one of two or more of the glazings in a preassembled permanently sealed insulating glass unit (IGU).
Effects of Test Procedures—Data generated using this test method may be used to evaluate and compare the effects of subjecting ECCs in IGUs to the accelerated weathering procedures described in Test Methods E 2141, E 2240, or E 2241 and Practice E 2094. This test method requires the measurement of uniformity as a basis for evaluating changes in one of several performance parameters.
4.2.1 Changes in the uniformity of the test specimens may vary from none to significant. Some physical changes in the specimens may be visible when there are no apparent changes in the performance. Similarly, performance changes may occur with no visible changes in the specimens.
4.2.2 All conditions of measurement in this test method must be described in the report so that an assessment of their significance can be made.
Sequencing—If this test method is performed as part of a combined sequence with other measurements of the ECC perfomance (see 8.2) and visual inspection (see 8.3 in Test Methods E 2141, E 2240, or E 2241) determined at the end of one of the test methods, the result may be used as the initial uniformity measurement for the next test; duplication of these uniformity measurements is not necessary unless so specified.
SCOPE
1.1 The test described is a method for measuring the uniformity of an absorptive electrochromic coating (ECC) in a static colored or bleached state on a glazing surface, which will ultimately be one of two or more glazings in a preassembled permanently sealed insulating glass unit (IGU). Cross sections of typical electrochromic windows (ECWs) have three to five-layers of coatings that include one to three active layers sandwiched between two transparent conducting electrodes (TCEs, see Section ). Examples of the cross-sectional arrangements can be found in "Evaluation Criteria and Test Methods for Electrochromic Windows." (For a list of acronyms used in this Standard, see , Section ).
1.2 The test method is applicable only for layered (one or more active coatings between the TCEs) absorptive ECCs on vision glass (superstrate and substrate) areas planned for use in IGUs for buildings, such as glass doors, windows, skylights, and exterior wall systems. The layers used for electrochromically changing the optical properties may be inorganic or organic materials between the superstrate and substrate and may include laminates.
1.3 The ECCs used in this test method will ultimately be exposed (Test Method E 2141) to solar radiation and deployed to control the amount of radiation by absorption and reflection and thus, limit the solar heat gain and amount of solar radiation that is transmitted into the building.
1.4 The test method is not applicable to other types of coatings on vision glass with other chromogenic coatings that cannot be held in a static colored or bleached state.
1.5 The test method is not applicable to IGUs that will be constructed from superstrate or substrate materials other than glass.
1.6 The test method is not applicable for measuring the uniformity of ECC coatings during the coloring or bleaching processes.
1.7 The test method referenced herein is a laboratory test conducted under specified conditions. This test method is intended for use in assessing the changes in uniformity of an ECC on vision glass, which will be incorporated into an IGU and subjected to a series of tests for assessing the durability of the coating or the IGU unit, or both.
1.8 The v...
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Designation:E2355–04
Standard Test Method for
Measuring the Uniformity of an Absorptive Electrochromic
1
Coating on a Glazing Surface
This standard is issued under the fixed designation E2355; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 The test method referenced herein is a laboratory test
conducted under specified conditions. This test method is
1.1 The test described is a method for measuring the
intended for use in assessing the changes in uniformity of an
uniformity of an absorptive electrochromic coating (ECC) in a
ECC on vision glass, which will be incorporated into an IGU
staticcoloredorbleachedstateonaglazingsurface,whichwill
and subjected to a series of tests for assessing the durability of
ultimately be one of two or more glazings in a preassembled
the coating or the IGU unit, or both.
permanently sealed insulating glass unit (IGU). Cross sections
1.8 The values stated in metric (SI) units are to be regarded
of typical electrochromic windows (ECWs) have three to
as the standard.
five-layers of coatings that include one to three active layers
1.9 There is no comparable International Standards Organi-
sandwiched between two transparent conducting electrodes
zation Standard.
(TCEs, see Section 3). Examples of the cross-sectional ar-
2
1.10 This standard does not purport to address all of the
rangements can be found in “Evaluation Criteria and Test
safety concerns, if any, associated with its use. It is the
MethodsforElectrochromicWindows.”(Foralistofacronyms
responsibility of the user of this standard to establish appro-
used in this Standard, see Appendix X1, Section X1.1).
priate safety and health practices and determine the applica-
1.2 The test method is applicable only for layered (one or
bility of regulatory requirements prior to use.
more active coatings between the TCEs) absorptive ECCs on
visionglass(superstrateandsubstrate)areasplannedforusein
2. Referenced Documents
IGUs for buildings, such as glass doors, windows, skylights,
3
2.1 ASTM Standards:
and exterior wall systems. The layers used for electrochromi-
C168 Terminology Relating to Thermal Insulation
cally changing the optical properties may be inorganic or
C1048 SpecificationforHeat-TreatedFlatGlass—KindHS,
organic materials between the superstrate and substrate and
Kind FT Coated and Uncoated Glass
may include laminates.
E2094 Practice for Evaluating the Service Life of Chro-
1.3 The ECCs used in this test method will ultimately be
mogenic Glazings
exposed (Test Method E2141) to solar radiation and deployed
E2141 Test Methods for Assessing the Durability of Ab-
to control the amount of radiation by absorption and reflection
sorptive Electrochromic Coatings on Sealed Insulating
andthus,limitthesolarheatgainandamountofsolarradiation
Glass Units
that is transmitted into the building.
E2188 Test Method for Insulating Glass Unit Performance
1.4 The test method is not applicable to other types of
E2190 Specification for Insulating Glass Unit Performance
coatings on vision glass with other chromogenic coatings that
and Evaluation
cannot be held in a static colored or bleached state.
E2240 Test Method for Assessing the Current-Voltage Cy-
1.5 The test method is not applicable to IGUs that will be
cling Stability at 90°C (194°F) ofAbsorptive Electrochro-
constructed from superstrate or substrate materials other than
mic Coatings on Sealed Insulating Glass Units
glass.
E2241 Test Method for Assessing the Current-Voltage Cy-
1.6 The test method is not applicable for measuring the
cling Stability at Room Temperature of Absorptive Elec-
uniformity of ECC coatings during the coloring or bleaching
trochromic Coatings on Sealed Insulating Glass Units
processes.
2.2 Canadian Standard:
CAN/CGSB12.8 Insulating Glass Units
1
This test method is under the jurisdiction of ASTM Committee E06 on
Performance of Buildings and is the direct responsibility of Subcommittee E06.22
on Durability Performance of Building Constructions.
Current edition approved April 1, 2004. Published April 2004. DOI: 10.1520/
3
E2355-04. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
2
Czanderna,A. W., and Lampert, C. M., “Evaluation Criteria and Test Methods contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
forElectrochromicWindows,” SERI/PR-255-3537,SolarEnergyResearchInstitute, Standards volume information, refer to the standard’s Document Summary page on
Golden, CO, July 1990. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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