Glass in buildings — Insulating glass — Part 3: Gas concentration and gas leakage

ISO 20492-3:2010 specifies two methods of test for insulating glass units, including a determination of the gas leakage rate and a determination of gas concentration tolerances. The two methods designated as approach 1, which is intended for use in markets such as North America, and approach 2, which is intended for use in markets such as Europe.

Verre dans la construction — Verre isolant — Partie 3: Concentration de gaz et fuite de gaz

General Information

Status
Published
Publication Date
28-Jul-2010
Current Stage
9093 - International Standard confirmed
Completion Date
04-Oct-2024
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ISO 20492-3:2010 - Glass in buildings -- Insulating glass
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INTERNATIONAL ISO
STANDARD 20492-3
First edition
2010-08-15
Glass in buildings — Insulating glass —
Part 3:
Gas concentration and gas leakage
Verre dans la construction — Verre isolant —
Partie 3: Concentration de gaz et fuite de gaz

Reference number
©
ISO 2010
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©  ISO 2010
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ii © ISO 2010 – All rights reserved

Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Requirements.3
4.1 Approach 1.3
4.2 Approach 2.3
5 Principle.4
5.1 Approach 1.4
5.2 Approach 2.4
6 Apparatus.4
6.1 Approach 1.4
6.2 Approach 2.4
7 Reagents and materials .5
7.1 Approach 1.5
7.2 Approach 2.5
8 Test specimens.5
8.1 Approach 1.5
8.2 Approach 2.7
9 Procedure.8
9.1 Approach 1.8
9.2 Approach 2.8
10 Precision of test method.10
10.1 Approach 1.10
10.2 Approach 2.10
11 Test report.10
11.1 Approach 1.10
11.2 Approach 2.10
Annex A (normative) Calibration and standardization of the gas chromatograph for approach 1.12
Annex B (normative) Requirements for other gases for approach 2 .14
Annex C (informative) Relationship between artificial and natural ageing with regard to thermal
and sound insulation .16
Annex D (informative) Determination of the gas leakage rate by gas chromatography for
approach 2 .17
Bibliography.27

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 20492-3 was prepared by Technical Committee ISO/TC 160, Glass in building, Subcommittee SC 1,
Product considerations.
ISO 20492 consists of the following parts, under the general title Glass in buildings — Insulating glass:
⎯ Part 1: Durability of edge seals by climate tests
⎯ Part 2: Chemical fogging tests
⎯ Part 3: Gas concentration and gas leakage
⎯ Part 4: Methods of test for the physical attributes of edge seals
iv © ISO 2010 – All rights reserved

Introduction
This International Standard consists of a series of procedures for testing the performance of pre-assembled,
permanently sealed insulating glass units or insulating glass units with capillary tubes that have been
intentionally left open. This International Standard is intended to help ensure that
⎯ energy savings are made, as the U value and solar factor (solar heat gain coefficient) do not change
significantly;
⎯ health is preserved, because sound reduction and vision do not change significantly;
⎯ safety is provided because mechanical resistance does not change significantly.
This International Standard also covers additional characteristics that are important to the trade, and marking
of the product (i.e. CE marking or other regulatory groups).
There are distinct markets to consider for insulating glass. Within each market there are technical differences
with respect to rebate sizes, vision lines and methods of application; two approaches are included in this
International Standard. Approach 1 addresses requirements for markets such as North America. Approach 2
addresses requirements for markets such as Europe. Each approach includes separate test methods and
specifications pertaining to minimum requirements for durability of edge seals by climate tests.
This International Standard does not cover physical requirements of sealed glass insulating units such as
appearance, thermo-physical properties, heat and light transmission, and glass displacement.
The main intended uses of the insulating glass units are installations in buildings and constructions such as in
windows, doors, curtain walling, skylights, roofs and partitions where protection against direct ultraviolet
radiation exists at the edges.
The use of insulating glass in cases where there is no protection against direct ultraviolet radiation at the
edges, such as structural glazing systems, can be suitable. However, it can be necessary to review factors
such as sealant longevity when exposed to long-term ultraviolet light and the structural properties of the
sealant for these applications.
NOTE 1 For more information on the requirements for structural sealant glazing applications, reference can be made to
ASTM C1369, ASTM C1249 and ASTM C1265 and CEN technical specifications.
NOTE 2 IG units whose function is artistic only are not part of this International Standard.
The test methods in this International Standard are intended to provide a means for testing the performance of
the sealing system and construction of sealed insulating glass units.
Sealed insulating glass units tested in accordance with these methods are not intended for long-term
immersion in water.
The options for testing apply only to sealed insulating glass units that are constructed with glass.
In certain cases such as insulating glass units containing spandrel glass or absorptive coatings, these
methods might not be applicable, as these products can experience field temperatures that exceed the
temperature limitations of the sealant.

INTERNATIONAL STANDARD ISO 20492-3:2010(E)

Glass in buildings — Insulating glass —
Part 3:
Gas concentration and gas leakage
1 Scope
This part of ISO 20492 specifies two methods of test for insulating glass units, including a determination of the
gas leakage rate and a determination of gas concentration tolerances. The two methods designated as
approach 1, which is intended for use in markets such as North America, and approach 2, which is intended
for use in markets such as Europe.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 16293-1, Glass in building — Basic soda lime silicate glass products — Part 1: Definitions and general
physical and mechanical properties
ISO 20492-1, Glass in building — Insulating glass —Part 1: Durability of edge seals by climate tests
ISO 20492-4, Glass in building — Insulating glass —Part 4: Methods of test for the physical attributes of edge
seals
EN 1279-6:2002, Glass in building — Insulating glass units — Part 6: Factory production control and periodic
tests
ASTM C1036, Standard Specification for Flat Glass
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 20492-1 and the following apply.
3.1
standard laboratory conditions
ambient temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) %
3.2
controlled limit environment conditions
environment temperature of 10 °C with a dew point temperature of −5 °C, giving a relative humidity of 32,8 %
3.3
accuracy
precision of the test method within confidence limits of 99 %
3.4
sealed insulating glass unit
pre-assembled unit, comprising lites (panes) of glass that are sealed at the edges and separated by
dehydrated space(s), intended for vision areas of buildings
NOTE The unit is normally used for windows, window walls, picture windows, sliding doors, patio doors, or other
types of fenestration.
3.5
gas-filled insulating glass units
sealed insulating glass unit in which the cavity contains gas(es) in addition to air, usually for improving thermal
and/or sound insulation
3.6
reference standard mixtures
gas mixtures that contain known percentages of argon, o
...

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