EN IEC 62788-6-2:2020

SLOVENSKI STANDARD
01-julij-2020
Merilni postopki za materiale, uporabljene v fotonapetostnih modulih - 6-2. del:
Splošni preskusi - Preskušanje pronicanja vlage pri polimernih materialih
Measurement procedures for materials used in photovoltaic modules - Part 6-2: General
tests - Moisture permeation testing with polymeric materials
Messverfahren für Werkstoffe, die in Photovoltaik-Modulen verwendet werden - Teil 6-2:
Allgemeine Prüfungen - Permeationsprüfung mit polymeren Materialien
Procédures de mesure des matériaux utilisés dans les modules photovoltaïques - Partie
6-2: Essais génériques - Essais de perméation à l’humidité des matériaux polymères
Ta slovenski standard je istoveten z: EN IEC 62788-6-2:2020
ICS:
27.160 Sončna energija Solar energy engineering
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62788-6-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 27.160
English Version
Measurement procedures for materials used in photovoltaic
modules - Part 6-2: General tests - Moisture permeation testing
of polymeric materials
(IEC 62788-6-2:2020)
Procédures de mesure des matériaux utilisés dans les Messverfahren für Werkstoffe, die in Photovoltaik-Modulen
modules photovoltaïques - Partie 6-2: Essais génériques - verwendet werden - Teil 6-2: Allgemeine Prüfungen -
Essais de perméation à l'humidité des matériaux polymères Permeationsprüfung mit polymeren Materialien
(IEC 62788-6-2:2020) (IEC 62788-6-2:2020)
This European Standard was approved by CENELEC on 2020-04-23. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62788-6-2:2020 E

European foreword
The text of document 82/1659/FDIS, future edition 1 of IEC 62788-6-2, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62788-6-2:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-01-23
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-23
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62788-6-2:2020 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61730-1 NOTE Harmonized as EN IEC 61730-1

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
ISO 2528 - Sheet materials - Determination of water - -
vapour transmission rate - Gravimetric (dish)
method
ISO 9932 - Paper and board - Determination of water - -
vapour transmission rate of sheet materials -
Dynamic sweep and static gas methods
ISO 15106-1 - Plastics - Film and sheeting - Determination EN ISO 15106-1 -
of water vapour transmission Rate - Part 1:
Humidity detection sensor method
ISO 15106-2 - Plastics - Film and sheeting - Determination EN ISO 15106-2 -
of water vapour transmission Rate - Part 2:
Infrared detection sensor method
ISO 15106-3 - Plastics - Film and sheeting - Determination EN ISO 15106-3 -
of water vapour transmission Rate - Part 3:
Electrolytic detection sensor method
ISO 15106-4 - Plastics - Film and sheeting - Determination - -
of water vapour transmission Rate - Part 4:
Gas-chromatographic detection sensor
method
IEC/TS 61836 - Solar photovoltaic energy systems - Terms, - -
definitions and symbols
ASTM F1249-06 - Standard test method for water vapour - -
transmission rate through plastic film and
sheeting using a modulated infrared sensor

IEC 62788-6-2 ®
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Measurement procedures for materials used in photovoltaic modules –

Part 6-2: General tests – Moisture permeation testing of polymeric materials

Procédures de mesure des matériaux utilisés dans les modules

photovoltaïques –
Partie 6-2: Essais génériques – Essais de perméation à l’humidité des matériaux

polymères
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-7921-2

– 2 – IEC 62788-6-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols. 7
3.1 Terms and definitions . 7
3.2 Symbols . 7
4 Apparatus . 8
5 Test specimens . 8
6 Procedure . 9
7 Calculations . 10
7.1 Determination of diffusivity and solubility of moisture . 10
7.2 Determination of breakthrough constant . 11
7.3 Variable temperature measurement . 12
7.4 Variable relative humidity measurement . 13
8 Test report . 13
Annex A (informative) Example data . 15
A.1 Example of Fickian diffusion . 15
A.2 Example of failed measurement of Fickian diffusion . 16
A.3 Example of non-Fickian diffusion . 17
Bibliography . 19

Figure 1 – Diagram of a diffusion cell . 9
Figure A.1 – Example of Fickian diffusion in EVA at 85 °C and 100 % RH with a 2,84
mm thick film . 16
Figure A.2 – Example of a failed data set for Fickian diffusion in polyethylene
terepthalate at 22 °C and 100 % RH . 17
Figure A.3 – Example of non–Fickian diffusion in a desiccant filled polyisobutylene
material used as an edge seal . 18

IEC 62788-6-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT PROCEDURES FOR MATERIALS
USED IN PHOTOVOLTAIC MODULES –

Part 6-2: General tests –
Moisture permeation testing of polymeric materials

FOREWORD
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International Standard IEC 62788-6-2 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The text of this
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