ASTM E3120-19

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Designation: E3120 − 17 E3120 − 19
Standard Specification for
Evaluating Accelerated Aging Performance of
Environmentally Controlled Dynamic Glazings
This standard is issued under the fixed designation E3120; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification is applicable to environmentally controlled dynamic glazings (ECDG) whose visible light transmittance
or near infrared light transmittance properties, or both, can be changed reversibly by exposure to changing environmental
conditions such as temperature and sunlight intensity. This includes thermochromic and thermotropic glazing, but currently
excludes photochromic glazings as neither Test Method E3119 nor this specification provide a procedure to access multiple states
of photochromic glazing specimens.
1.2 This specification does not apply to other types of dynamic glazing which require an electrical stimulus to change light
transmittance, such as electrochromic glazings.
1.3 This specification covers environmentally controlled dynamic glazing (ECDG) in monolithic glass, monolithic laminated
glass, or pre-assembled, permanently sealed insulating glass units with one or more cavities in which at least one lite is an ECDG
(which may be in the form of a laminated lite or a single pane with coatings or film applied). This specification is also applicable
to ECDG devices in pre-assembled insulating glass units with capillary tubes intentionally left open. As applicable, this
specification also requires conformance to Specification E2190.
1.4 This specification is applicable only to monolithic glass, monolithic laminated glass, and sealed insulating glass units that
are constructed with glass and fabricated for vision glass areas for use in buildings, such as sliding doors, windows, skylights, and
exterior wall systems.
1.5 Qualification under this specification is intended to provide a basis for evaluating the aging performance of environmentally
controlled dynamic glazing in monolithic glass, monolithic laminated glass, and sealed insulating glass units.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.8 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C162 Terminology of Glass and Glass Products
C1036 Specification for Flat Glass
C1048 Specification for Heat-Strengthened and Fully Tempered Flat Glass
C1172 Specification for Laminated Architectural Flat Glass
E631 Terminology of Building Constructions
E2190 Specification for Insulating Glass Unit Performance and Evaluation
E3119 Test Method for Accelerated Aging of Environmentally Controlled Dynamic Glazing
This specification 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 Sept. 1, 2017July 1, 2019. Published December 2017September 2019. Originally approved in 2017. Last previous edition approved in 2017 as
E3120–17. DOI: 10.1520/E3120-17.10.1520/E3120–19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E3120 − 19
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
3. Terminology
3.1 Definitions—For definitions of terms found in this specification, refer to Terminologies C162, E631, and G113.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 environmentally controlled dynamic glazing, n—in a prepared opening of a building, the glazing material installed in
which the optical properties can change in response to environmental stimuli such as sunlight and/or temperature.
3.2.2 photochromic glazing, n—an environmentally controlled dynamic glazing which changes its optical properties in response
to exposure to solar radiation.
3.2.3 sealed insulating glass unit, n—a preassembled unit, comprising lites of glass, which are sealed at the edges and separated
by dehydrated cavity(s), intended for vision areas of buildings. The unit is normally used for windows, window walls, picture
windows, sliding doors, patio doors, or other types of fenestration.
3.2.4 specular (regular) transmittance, n—the optical transmittance that does not include light with a diffuse component.
3.2.5 thermochromic glazing, n—an environmentally controlled dynamic glazing which changes its optical properties in
response to exposure to a broad range of temperatures (≥10 °C).
3.2.6 thermotropic glazing, n—an environmentally controlled dynamic glazing which changes its optical properties at a discrete
temperature or over a small range of temperatures (that is, <10 °C).
3.2.7 transition temperature, n—specifically in thermotropic ECDG, it is temperature at which the optical properties of a given
glazing switches between highest transmittance state and lowest transmittance state.
3.2.7.1 Discussion—
In thermochromic glazing, the optical properties change continuously over a broad temperature range (that is, ≥ 10 °C) ≥10 °C)
and so do not have a transition temperature.
3.3 Acronyms Used in This Specification:
3.3.1 ECDG—environmentally controlled dynamic glazing.
3.3.2 IG—insulating glass.
3.3.3 IGU(s)—insulating glass unit(s).
3.3.4 Τ —highest specified temperature for recording spectral data.
H
3.3.5 Τ —lowest specified temperature for recording spectral data.
L
3.3.6 Τ —midrange specified temperature for recording spectral data.
M
3.3.6.1 Discussion—
For thermotropic glazings, T shall be a temperature 1 to 3 °C less than the stated transition temperature, if single value is given
M
for the transition temperature. T shall be a temperature 1 to 3 °C less than the midpoint of stated transition temperature range,
M
if a range of values is stated for the transition temperature for the thermotropic glazing.
3.3.7 τ —visible light (photopic) specular photopic (specular) transmission of a specimen at Τ .
H H
3.3.8 τ —visible light (photopic) specular photopic (specular) transmission of a specimen at Τ .
L L
3.3.9 τ —visible light (photopic) specular photopic (specular) transmission of a specimen at Τ .
M M
4. Performance Requirements
4.1 For the specimens tested to Test Method E3119, visible light transmittance in the highest transmittance state and the lowest
transmittance state shall change by no more than 65 %Τ absolute. That is:
τ ~initial! 2 τ ~final! # 0.05 (1)
? H H ?
τ ~initial! 2 τ ~final! # 0.05 (2)
? M M ?
τ ~initial! 2 τ ~final! # 0.05 (3)
? L L ?
where:
τ (initial) = the visible light transmittance at Τ measured prior to testing according to Test Method E3119.
H H
τ (initial) = the visible light transmittance at Τ measured prior to testing according to Test Method E3119.
M M
τ (initial) = the visible light transmittance at Τ measured prior to testing according to Test Method E3119.
L L
τ (final) = the visible light transmittance at Τ measured after testing according to Test Method E3119.
H H
E3120 − 19
τ (final) = the visible light transmittance at Τ measured after testing according to Test Method E3119.
M M
τ (final) = the visible light transmittance at Τ measured after testing according to Test Method E3119.
L L
4.2 Insulating glass test specimens containing the ECDG shall meet the requirements of Specification E2190.
4.3 Monolithic laminated glass test specimens containing the ECDG shall meet the requirements of Specification
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