Glass in building - Insulating glass units - Part 3: Long term test method and requirements for gas leakage rate and for gas concentration tolerances

This European Standard describes the test method for the determination of gas leakage rate and specifies the requirements for limit values for gas leakage rate and gas concentration for gas filled insulating glass units made
a) in accordance with prEN 1279-1:2015 and prEN 1279-6:2015 or
b) for the purpose to demonstrate that components (e.g. edge seals or spacers) will allow the insulating glass unit to conform to the requirements given in prEN 1279-1:2015, Clause 6.

Glas im Bauwesen - Mehrscheiben-Isolierglas - Teil 3: Langzeitprüfverfahren und Anforderungen bezüglich Gasverlustrate und Grenzabweichungen für die Gaskonzentration

Dieser Teil der vorliegenden Europäischen Norm beschreibt das Prüfverfahren für die Bestimmung der Gasverlustrate und legt die Anforderungen an die Grenzwerte für die Gasverlustrate und die Gaskonzentration von gasgefülltem Mehrscheiben Isolierglas fest, das
a)   in Übereinstimmung mit prEN 1279 1:2015 und prEN 1279 6:2015 gefertigt wurde oder
b) gefertigt wurde, um zu zeigen, dass die Komponenten (z. B. Randverbund oder Abstandhalter) es zulassen, dass das Mehrscheiben Isolierglas mit den Anforderungen in prEN 1279 1:2015, Abschnitt 6, übereinstimmt.

Verre dans la construction - Vitrage isolant préfabriqué scellé - Partie 3 : Méthode d'essai à long terme pour le débit de fuite et prescriptions pour les tolérances de concentration en gaz

Le présent document décrit la méthode d'essai pour la détermination du débit de fuite de gaz et spécifie les prescriptions relatives aux valeurs limites du débit de fuite de gaz et de concentration du gaz pour les vitrages isolants produits
a)   conformément à l’EN 1279-1:2018 et fabriquées conformément à l’EN 1279-6:2018 ; ou
b)   dans le but de démontrer que des composants (par exemple, mastics ou espaceurs) permettront au vitrage isolant d'être conformes aux exigences de l’EN 1279-1:2018, Article 6.

Steklo v gradbeništvu - Izolacijsko steklo - 3. del: Dolgoročna preskusna metoda ter zahteve za stopnjo uhajanja plina in tolerance koncentracije plina

Ta evropski standard opisuje preskusno metodo za ugotavljanje stopnje uhajanja plina in določa zahteve za mejne vrednosti stopnje uhajanja plina in koncentracije plina za izolacijsko steklo, napolnjeno s plinom, izdelano
a) v skladu s standardom prEN 1279-1:2015 in prEN 1279-6:2015 ali
b) za dokazovanje, da komponente (npr. robna tesnila ali distančniki) steklu omogočajo skladnost z zahtevami, opredeljenimi v točki 6 standarda prEN 1279-1:2015.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2015
Publication Date
05-Sep-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
02-Aug-2018
Due Date
07-Oct-2018
Completion Date
06-Sep-2018

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SLOVENSKI STANDARD
SIST EN 1279-3:2018
01-oktober-2018
1DGRPHãþD
SIST EN 1279-3:2004
6WHNORYJUDGEHQLãWYX,]RODFLMVNRVWHNORGHO'ROJRURþQDSUHVNXVQDPHWRGD
WHU]DKWHYH]DVWRSQMRXKDMDQMDSOLQDLQWROHUDQFHNRQFHQWUDFLMHSOLQD
Glass in building - Insulating glass units - Part 3: Long term test method and
requirements for gas leakage rate and for gas concentration tolerances
Glas im Bauwesen - Mehrscheiben-Isolierglas - Teil 3: Langzeitprüfverfahren und
Anforderungen bezüglich Gasverlustrate und Grenzabweichungen für die
Gaskonzentration

Verre dans la construction - Vitrage isolant préfabriqué scellé - Partie 3 : Méthode

d'essai à long terme pour le débit de fuite et prescriptions pour les tolérances de

concentration en gaz
Ta slovenski standard je istoveten z: EN 1279-3:2018
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
SIST EN 1279-3:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1279-3:2018
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SIST EN 1279-3:2018
EN 1279-3
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2018
EUROPÄISCHE NORM
ICS 81.040.20 Supersedes EN 1279-3:2002
English Version
Glass in building - Insulating glass units - Part 3: Long term
test method and requirements for gas leakage rate and for
gas concentration tolerances

Verre dans la construction - Vitrage isolant - Partie 3 : Glas im Bauwesen - Mehrscheiben-Isolierglas - Teil 3:

Méthode d'essai à long terme pour le débit de fuite et Langzeitprüfverfahren und Anforderungen bezüglich

prescriptions pour les tolérances de concentration en Gasverlustrate und Grenzabweichungen für die

gaz Gaskonzentration
This European Standard was approved by CEN on 2 March 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1279-3:2018 E

worldwide for CEN national Members.
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SIST EN 1279-3:2018
EN 1279-3:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Symbols and abbreviations ......................................................................................................................... 5

5 Requirements ................................................................................................................................................... 6

5.1 Gas leakage rate ............................................................................................................................................... 6

5.2 Tolerances on gas concentration............................................................................................................... 7

5.3 Durability of the gas and interaction with IGU components ........................................................... 7

6 Test method ...................................................................................................................................................... 7

6.1 Principle of testing .......................................................................................................................................... 7

6.2 Apparatus ........................................................................................................................................................... 7

6.2.1 Climate exposure equipment ...................................................................................................................... 7

6.2.2 Container for gas leakage rate measurement ....................................................................................... 7

6.2.3 Gas analysis equipment ................................................................................................................................ 7

6.2.4 Gas sampling device ....................................................................................................................................... 8

6.2.5 Preparation of test specimens .................................................................................................................... 8

6.2.6 Number of test specimens ............................................................................................................................ 8

6.3 Procedure........................................................................................................................................................... 8

6.3.1 Determination of internal volume V of a test specimen ................................................................ 8

int

6.3.2 Climate exposure ............................................................................................................................................. 8

6.3.3 Measuring the gas leakage ........................................................................................................................... 9

6.3.4 Analysis of gas .................................................................................................................................................. 9

6.4 Evaluation .......................................................................................................................................................... 9

7 Test report ...................................................................................................................................................... 10

Annex A (normative) Reference method for the determination of the gas leakage rate by gas

chromatography ........................................................................................................................................... 12

A.1 Principle of method ..................................................................................................................................... 12

A.2 Equipment ...................................................................................................................................................... 12

A.3 Preparation of test specimens ................................................................................................................. 16

A.4 Procedure........................................................................................................................................................ 17

Annex B (informative) Relationship between artificial and natural ageing with regard to

thermal and sound insulation ................................................................................................................. 23

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SIST EN 1279-3:2018
EN 1279-3:2018 (E)
European foreword

This document (EN 1279-3:2018) has been prepared by Technical Committee CEN/TC 129 “Glass in

building”, the secretariat of which is held by NBN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by January 2019 and conflicting national standards shall

be withdrawn at the latest by January 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1279-3:2002.
The main changes compared to the previous edition EN 1279-3:2002 are:
a) the standard has been fully technically and editorially revised;
b) the scope has been changed;
c) Terms and definitions and symbols have been split into two clauses;
d) requirement for gas leakage rate has been significantly changed;
e) the test method of this standard is also applicable to triple glazing units;

f) gas leakage rate can be determined after ageing a minimum two and a maximum four test

specimens. Durability of gas and interaction with IGU components has been added to requirements;

g) precision of the test method has been moved to A.4.8 and updated following a new inter-laboratory

test performed in 2009;

h) "Test report" has been revised adding a full description of the test specimen;

i) “Requirements for other gases” has been changed and moved to EN 1279-5:2018, Annex B: “Effect

of gas filling on U and Rw”.
j) “Gas leakage rate by gas chromatography” is now Annex A;
k) exchange criteria for gases are given in EN 1279-1:2018, Annex D.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

This document is part of the series EN 1279 “Glass in building - Insulating glass units” which consists of

the following parts:

— Part 1: Generalities, system description, rules for substitution, tolerances and visual quality;

— Part 2: Long term test method and requirements for moisture penetration;

— Part 3: Long term test method and requirements for gas leakage rate and for gas concentration

tolerances;

— Part 4: Methods of test for the physical attributes of edge seal components and inserts;

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SIST EN 1279-3:2018
EN 1279-3:2018 (E)
— Part 5: Product standard;
— Part 6: Factory production control and periodic tests.
These parts are inextricably bound up with each other.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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SIST EN 1279-3:2018
EN 1279-3:2018 (E)
1 Scope

This European Standard describes the test method for the determination of gas leakage rate and

specifies the requirements for limit values for gas leakage rate and gas concentration for gas filled

insulating glass units made
a) in accordance with EN 1279-1:2018 and manufactured to EN 1279-6:2018, or

b) for the purpose to demonstrate that components (e.g. edge seals or spacers) will allow the

insulating glass unit to conform to the requirements given in EN 1279-1:2018, Clause 6.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

EN 673, Glass in building - Determination of thermal transmittance (U value) - Calculation method

EN 1279-1:2018, Glass in building - Insulating glass units - Part 1: Generalities, system description, rules

for substitution, tolerances and visual quality

EN 1279-2:2018, Glass in building - Insulating glass units - Part 2: Long term test method and

requirements for moisture penetration

EN 1279-6:2018, Glass in building - Insulating glass units - Part 6: Factory production control and

periodic tests
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1279-1:2018 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Symbols and abbreviations
Symbol Characteristic Unit
c concentration of gas i determined in accordance with 6.3.4 %
c nominal value for a system of insulating glass and gas i which is the basis %
i,o
for testing sound insulation and/or calculating or testing thermal
insulation to fix the respective R and U-value
m mass of gas that has leaked from a gas-filled unit in a given time µg/h
L gas leakage rate %∙a
L maximum gas leakage rate from all tested specimens %∙a
i,max
average gas leakage rate for all tested specimens %∙a
i,av
P absolute atmospheric pressure at which the unit was sealed hPa
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SIST EN 1279-3:2018
EN 1279-3:2018 (E)
Symbol Characteristic Unit
P atmospheric pressure at which ρ was determined hPa
0 0
T temperature at which unit was sealed K
T temperature at which ρ was determined K
0 0
V internal volume of the test specimen according to 6.3.1 in mm
int
ρ density of gas i at temperature T and pressure P in µg/mm
0,i 0 0
5 Requirements
5.1 Gas leakage rate

The gas leakage rate Li for IGU containing gas(es) in concentrations higher than 15 % by volume per gas

are measured as described in Clause 6 and shall be determined on an average of at least two specimens

and maximum 4 specimens.
NOTE The number of specimens to be tested is decided by the manufacturer.
L , ≤ 1,0 in % a
i av
With an absolute limit of all individual L , ≤ 1,20 in % a
i max

Individual values shall be rounded to the second decimal place. Average value shall be rounded to one

decimal place.
EXAMPLE 1 Measurements of only two specimens:
a) 0,89 and 0,91 = > average 0,9, passed; no further measurement
b) 0,91 and 1,09 = > average 1,0, passed; no further measurement
c) 0,82 and 1,22 = > average 1,0, failed (1,22) ; no further measurement

d) 1,10 and 1,08 = > average 1,1 failed; further measurements optional: see option A or B

e) 0,98 and 1,15 = > average 1,1 failed; further measurements optional: see option A or B

Optional further measurements:
Option A:
— If with the 3rd specimen the mean value is ≤ 1,0: passed

— If with the 3rd specimen the mean value stays > 1,0 but the value of the 3rd specimen is ≤ 1,20, test

the 4th specimen and if with the 4th specimen the mean value is ≤ 1,0: passed.

— If the mean value of 4 specimens remain > 1,0: failed
Option B:

Measure Li of further 2 specimens and if average value of the 4 tested specimens is less than 1,0 and no

individual value > 1,20: passed
EXAMPLE 2 Measurements of 4 specimens

Measure directly 4 specimens and determine Li,av and Li,max and compare with requirements given.

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SIST EN 1279-3:2018
EN 1279-3:2018 (E)

For most insulating glass units, measured Li values are much higher than actual gas leakage values after

10 years of natural ageing. Therefore, the limiting value shall not be used for calculating the gas

concentration during the lifetime of the IGU. See also Annex B.
5.2 Tolerances on gas concentration

Gas concentration before and after the test procedure given in 6.3, shall not be lower than 5 % absolute

below the nominal value used to calculate the U-value declared by the IGU manufacturer.

5.3 Durability of the gas and interaction with IGU components

For the purposes of gas filling, only inert gases should be used like Ar, Kr, Xe. The use of any other gas

will require chemical compatibility tests to be carried out.
6 Test method
6.1 Principle of testing

The gas leakage rate at 20 °C is measured after subjecting the test specimens to a climate exposure as

specified in EN 1279-2:2018 with the following modifications:
— in step 1 the number of cycles is 28; and
— in step 2 the time at a constant temperature of 58 °C is 4 weeks.

For the measurement of the gas leakage rate, the specimen is placed in a gastight container and, after a

given time, the amount of gas which has leaked from the specimen is measured. After this

measurement, the gas concentration in the specimen is analysed and the gas leakage rate calculated.

6.2 Apparatus
6.2.1 Climate exposure equipment
Test apparatus for the climate exposure shall be as specified in EN 1279-2:2018.
6.2.2 Container for gas leakage rate measurement

A container with temperature control shall be used for measuring the gas leakage rate, which shall be

hermetically sealable, and capable of receiving the specimen. Under the test conditions as little stress as

possible shall be induced and the residual volume in the container shall be as small as possible. The

sealed edges of the test specimens shall be exposed to the circulating purging gas (see Annex A).

The quantity of ambient air penetrating into the container from outside, or the quantity of each

constituent leaking from the container, shall be measured in a blank test using a solid glass body of

approximately the same dimensions as the test specimens.

The container shall be deemed to have an adequate degree of tightness if the measured quantity of gas

during the blank measurement does not exceed 10 % of the mass of gas leaking from the test specimen.

The container shall have fittings for introducing specific gases and for taking gas samples.

6.2.3 Gas analysis equipment
Gas analysis equipment shall be used which is capable of:

— analysis of the gaseous constituents essential to the insulation function of the glass unit, for

concentrations of 50 · 10 ;

— determination of percentages by volume of gas of up to 100 % within ± 3 % (relative).

These tasks need not be performed using the same equipment.
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SIST EN 1279-3:2018
EN 1279-3:2018 (E)
6.2.4 Gas sampling device

A device shall be used for taking gas samples from the tested IGU specimens, ensuring that the result is

not distorted by ingress of air, segregation phenomena, or similar. The gas samples shall be

representative for the whole gas volume.
6.2.5 Preparation of test specimens

The test specimens shall be representative of the system description (see EN 1279-1:2018, Annex A)

and shall consist of two panes of 4 mm glass in accordance with EN 1279-1:2018, 5.2. If 4 mm glass is

not available, the thickness as near as possible to 4 mm shall be used. The length shall be (502 ± 2) mm

and the width (352 ± 2) mm. The cavity width shall be nominal 12 mm, or if not manufactured, a cavity

width as near as possible to 12 mm.

Specimens of triple glazed units may also be tested. Length, width and cavity width should fulfil the

above mentioned descriptions. The gas loss rates of the individual cavities may be different. Therefore,

only an average value can be given. There is no specific requirement on individual cavities.

The panes of the test specimen shall be flat when the unit is sealed. During sealing, the ambient

temperature, T is measured in °C and recorded in K, and the absolute pressure, P in hPa, shall be

measured and recorded. The test specimens shall be manufactured in such a way that the gas

concentration shall not be lower than 5 % absolute of the declared value ci,o, for each gas when gas

mixtures are used.
6.2.6 Number of test specimens

At least six test specimens shall be prepared of which at least two shall be tested as described in 6.3.3

after climate exposure.
6.3 Procedure
6.3.1 Determination of internal volume V of a test specimen
int

Measure the clear distance between opposite spacers, d1 and d2, to the nearest 1 mm, e.g. by means of a

gauge graduated in millimetres. Determine the clear distance between the inner pane surfaces, d3, by

measuring the distance between the inner pane surfaces at mid-length on the four edges of the test

specimen, to the nearest 0,1 mm, and calculate the mean. The internal volume, V in mm , is obtained

int
in accordance with Formula (1):
Vd = 1 ⋅⋅d2 d3 (1)
int
6.3.2 Climate exposure
The climate exposure as specified in 6.1 sha
...

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