ASTM E2094-00
(Practice)Standard Practice for Evaluating the Service Life of Chromogenic Glazings
Standard Practice for Evaluating the Service Life of Chromogenic Glazings
SCOPE
1.1 This practice is intended to provide guidance to architects, specifiers, manufacturers, and other parties who have an interest in evaluating the service life of chromogenic glazings.
1.2 This practice is intended to cover the main factors about service life that must be considered when evaluating glazings for performance until the failure time is reached. However, users of this practice must be aware that other factors must be considered, such as the effect of the interaction of materials, the use of the glazings, and to the environment in which a chromogenic glazing is exposed over its service life.
1.3 The test methods referenced herein are laboratory tests conducted under specified conditions. These test methods are intended to simulate and, in some cases, to also accelerate actual in-service use of the chromogenic glazings. Results from these test methods cannot be used to predict the performance with time of units in the field unless actual corresponding field tests have been conducted and appropriate analyses have been conducted to show performance can be predicted from accelerated aging test methods.
General Information
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Standards Content (Sample)
Designation: E 2094 – 00
Standard Practice for
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Evaluating the Service Life of Chromogenic Glazings
This standard is issued under the fixed designation E 2094; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.2 chromogenic glazing—a glazing consisting of one or
more layers of chromogenic materials, which are able to alter
1.1 This practice is intended to provide guidance to archi-
their optical properties in response to a change in ambient
tects, specifiers, manufacturers, and other parties who have an
conditions such as illumination intensity, temperature, applied
interest in evaluating the service life of chromogenic glazings.
electric field, and so forth. The changeable optical properties
1.2 This practice is intended to cover the main factors about
include transmittance, reflectance, absorptance, and emittance.
service life that must be considered when evaluating glazings
3.2.3 durability—the capability of maintaining the service-
for performance until the failure time is reached. However,
ability of a product, component, assembly, or construction over
users of this practice must be aware that other factors must be
a specified time.
considered, such as the effect of the interaction of materials, the
3.2.4 serviceability—the capability of a building product,
use of the glazings, and to the environment in which a
component, assembly, or construction to perform the func-
chromogenic glazing is exposed over its service life.
tion(s) for which it was designed and constructed.
1.3 The test methods referenced herein are laboratory tests
3.2.5 service life (of a building component or material)—
conducted under specified conditions. These test methods are
the period of time after installation during which all properties
intended to simulate and, in some cases, to also accelerate
exceed minimum acceptable values when routinely main-
actual in-service use of the chromogenic glazings. Results from
tained.
these test methods cannot be used to predict the performance
with time of units in the field unless actual corresponding field
4. Significance and Use
tests have been conducted and appropriate analyses have been
4.1 This practice is important because producers of chro-
conducted to show performance can be predicted from accel-
mogenic glazings cannot wait for real-time in-service use to
erated aging test methods.
assess the product lifetime. Thus, a procedure is needed to
2. Referenced Documents estimate failure times based on accelerated weathering and
related factors and tests. This practice does not provide
2.1 ASTM Standards:
guidance for how to follow the steps outlined as follows, but it
C 168 Terminology Relating to Thermal Insulating Materi-
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provides as much information as is practical in an ASTM
als
practice.
E 632 Practice for Developing Accelerated Tests to Aid
Prediction of the Service Life of Building Components and
5. Background
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Materials
5.1 Observations and measurements have shown that some
G 113 Terminology Relating to Natural and Artificial
3 of the performance characteristics of chromogenic glazings
Weathering Tests of Nonmetallic Materials
have a tendency to deteriorate over time. In selecting materials
3. Terminology and glazings for any application, the ability of that glazing to
perform over time is an indication of that glazing’s durability.
3.1 Definitions—Refer to the terminology given in Termi-
The ability of the product to perform over time, at or better
nologies C 168 and G 113 and Practice E 632 for definitions of
than specified requirements, is an indication of the service life
general terms.
of the glazings. While these two indicators are related, the
3.2 Definitions of Terms Specific to This Standard:
purpose of this practice is to address the service life of
3.2.1 accelerated aging test—an aging test in which the rate
chromogenic glazings.
of degradation of building components or materials is inten-
5.2 Chromogenic glazings perform a number of important
tionally accelerated over that expected in actual service.
functions in a building envelope including: providing for
architectural expression, human comfort (heat gain/heat loss),
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This practice is under the jurisdiction of ASTM Committee E-6 on Performance
security, ventilation, illumination and glare control, passive
of Buildings and is the direct responsibility of Subcommittee E06.22 on Durability
Performance solar energy gain, minimization of the solar energy heat gain,
Current edition approved May 10, 2000. Published July 2000.
(possibly) acoustical performance, and a visual connection
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Annual Book of ASTM Standards, Vol 04.06.
with the outside world. These are some of the functions that
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Annual Book of ASTM Standards, Vol 14.04.
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