ASTM E2189-19

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Designation: E2189 − 10 E2189 − 19
Standard Test Method for
Testing Resistance to Fogging in Insulating Glass Units
This standard is issued under the fixed designation E2189; 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.
ε NOTE—6.1.6, 6.1.7, and 6.2.1 were corrected editorially in March 2012.
1. Scope
1.1 This test method covers procedures for testing the resistance to fogging of preassembledpre-assembled permanently sealed
insulating glass units or insulating glass units with capillary tubes intentionally left open.open or closed.
1.2 This test method is applicable only to sealed insulating glass units that are constructed with glass.glass or suspended film.
1.3 This test method is applicable to both double-glazed and triple-glazed insulating glass units; for triple-glazed insulating
glass units where both of the outer lites are glass and the inner lite is either glass or a suspended film.
1.4 The unit construction used in this test method contains construction details that are essential components of the test.
Different types of glass, different glass thicknesses, and different airspacecavity sizes may affect the test results.
1.5 This test method is not applicable to sealed insulating glass units containing a spandrel glass coating due to testing
limitations.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this The values
given in parentheses after SI units are provided for information only and are not considered 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 safety, health, and healthenvironmental 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
C717 Terminology of Building Seals and Sealants
E631 Terminology of Building Constructions
E2188 Test Method for Insulating Glass Unit Performance
E2190 Specification for Insulating Glass Unit Performance and Evaluation
3. Terminology
3.1 Definition of Terms:
3.1.1 For definitions of terms found in the standard, refer to Terminology C717, Terminology C162 and Terminology E631.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 cavity, n—the space within an insulating glass unit created by the sealing system where water vapor is controlled to prevent
the formation of condensation. Cavities may be air-filled or inert gas-filled.
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 Nov. 1, 2010April 1, 2019. Published November 2010May 2019. Originally approved in 2002. Last previous editionsedition approved in
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20022010 as E2189 – 02.E2189–10 . DOI: 10.1520/E2189-10E01.10.1520/E2189–19.
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3.2.2 fog, n—visible deposits present after testing in accordance with Section 8 that were not present prior to testing. Fog does
not include defects in a glass coating or the glass substrate when examined prior to testing.
3.2.3 internal components, n—the components of an insulating glass unit that typically do not contribute to water vapor control
of the cavity. Internal components may be decorative, such as false muntins, decorative glass, caming, and other decorative
materials. Internal components may also be functional, such as blinds or shades.
3.2.4 sealing system, n—the components of an insulating glass unit that together function to create the cavity and control cavity
water vapor content. Sealing system components typically include a spacer, a desiccant, and sealant(s).
4. Significance and Use
4.1 This test method is intended to provide a means for testing the resistance to fogging in sealed insulating glass units.
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4.2 This test method is also intended to provide a means for testing the resistance to fogging caused by components in the
interior of the unit. These interior components include, but are not limited to, suspended or applied films, decorative components,
muntins, and coatings.volatility of components within the unit, including the sealing system components and internal components.
5. Test Specimens
5.1 Each test specimen shall be manufactured in accordance with Test Method E2188, Section 5.
5.2 For test specimens containing muntin bars, the specimens shall be fabricated with the muntin barsone vertical and one
horizontal muntin bar dividing the specimens into nine equal areas (3 by 3). See four areas as shown in Fig. 1.
5.3 Test specimens containing other types of internal components shall contain the internal component design to be qualified.
If the internal component design cannot fit in the designated specimen size, specimens shall be fabricated containing representative
quantities of each component of the design to be qualified.
5.4 Viewing of the fog shall not be compromised by any internal component.
5.5 For double-glazed units, at least three specimens of identical component materials and construction shall be submitted.
5.6 For triple-glazed units, at least five specimens of identical component materials and construction shall be submitted. For
these units, the manufacturer shall specify the exterior surface.
NOTE 1—Certain reflective coatings may interfere with the ability to view fog.
5.7 During all stages of storage and handling, the units shall be held in a vertical position with equal support to all panes and
no compression loading.
5.8 Damaged units shall not be tested.
FIG. 1 Schematic Drawing of Insulating Glass Unit with Muntin Bars
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6. Apparatus
6.1 Volatile Fog Test Apparatus:
6.1.1 The dimensions and components are found in Fig. 2. The construction of the apparatus shall be capable of maintaining
50 6 3°C. 50 6 3 °C (122 6 5 °F). In order to maintain this temperature, a at least one circulating fan shall be mounted in the
box. The fan circulating fan(s) shall run as needed in order to maintain theuniform air temperature in the apparatus. Alternatively,
a proportional temperature-controlled exhaust fan may be installed in a strategically located vent. A supplemental heating element
with controller may also be added to the box, if needed.
6.1.2 The apparatus shall be constructed from sturdy, solid materials that minimize the escape of ultraviolet light into the
1 3
surrounding area. ⁄2One-half or ⁄4 in. plywood has been found suitable for this purpose. Stainless steel construction is also
acceptable.
FIG. 2 Volatile Fogging Exposure Box
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6.1.3 The interior of the apparatus shall have a reflective surface. If plywood is used to construct the apparatus, then line the
entire interior of the apparatus with aluminum foil or other reflective material.
6.1.4 The test specimen supports shall be located as shown in Fig. 2.
6.1.5 The chamber shall have radiation-shielded thermocouples to continuously monitor the chamber air temperature at the
locations shown in Fig. 2, identified by the labels TC1 through TC4.
6.1.6 The cooling plates shall be constructed of a conductive material such as copper or brass. The cooling plates shall be 150
6 5150 6 5 mm (6 6 ⁄16 mmin.) diameter and shall be placed directly in complete complete, direct contact with the glass surface
for the duration of the test. Alternatively, a rectangular cooling plate shall be
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177 6 6 cm177 6 6 cm (27.4 6 0.9 in. ) in area with an aspect ratio (long side/short side) less than or equal to 1.4.
6.1.7 The cooling water temperature shall be determined as the water immediately exits the apparatus from each cooling plate
as shown in Fig. 2. The cooling water temperature at these locations shall be 21 6 2°C.21 6 2 °C (70 6 4 °F).
6.1.8 Alternatively, an electric chilling apparatus shallmay be used to controlkeep the cooling plate.plate at 21 6 2 °C
(70 6 4 °F).
6.2 Ultraviolet Light Source:
6.2.1 Warning—Ultraviolet light sources used in this test method are harmful to the human body, especially to the eyes.
Appropriate protective measures must be observed. The source shall consist of one 300 W ultraviolet lamp and shall be placed as
shown in Fig. 2. The output of the UV source shall be measured from a distance of 355 6 5 mm with a long-wave ultraviolet meter
and shall not be less than 400 μW/cm .
6.2.2 The light source shall consist of one 300 W ultraviolet lamp that shall be mounted to, and centered on, the floor of the
box such that the top of the lamp is 205 6 5 mm (8 6 ⁄16 in.) from the box floor. The voltage to the lamp shall be 230 6 10 VAC.
6.2.3 The output of the UV light source shall not be less than 400 μW/cm when measured with a UVA ultraviolet radiometer
at a distance of 355 6 5 mm (14 6 ⁄16 in.) normal to the top surfa
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