EN IEC 62788-6-2:2020
(Main)Measurement procedures for materials used in photovoltaic modules - Part 6-2: General tests - Moisture permeation testing of polymeric materials
Measurement procedures for materials used in photovoltaic modules - Part 6-2: General tests - Moisture permeation testing of polymeric materials
IEC 62788-6-2:2020 provides methods for measuring the steady-state water vapour transmission rate (WVTR), water vapour permeability (P), diffusivity (D), solubility (S), and moisture breakthrough time (Ƭ10) (defined as the time to reach 10 % of the steady state WVTR) for polymeric materials such as encapsulants, edge seals, frontsheets and backsheets. These measurements can be made at selected temperatures and humidity levels as deemed appropriate for evaluation of their performance in PV modules. Measurement is accomplished by inspection of the transient WVTR curve and by fitting it to a theoretical Fickian model. This document is best applied to monolithic films. If multilayer films are used, the D and S values are only apparent values, but the steady-state values can still be measured.
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
l’IEC 62788-6-2:2020 fournit des méthodes de mesure du coefficient de transmission de la vapeur d’eau (WVTR – water vapour transmission rate) en régime établi, de la perméabilité de la vapeur d'eau (P), de la diffusivité (D), de la solubilité (S) et du temps d’infiltration de l’humidité (Ƭ10) (défini comme étant le temps permettant d’atteindre 10 % du WVTR en régime établi) pour les matériaux polymères tels que les encapsulants, les joints d’étanchéité périphériques et les couches avant et arrière. Ces mesurages peuvent être effectués à des températures et niveaux d’humidité choisis jugés appropriés pour l’évaluation de leurs performances dans les modules PV. Le mesurage est effectué par l’examen de la courbe du WVTR transitoire et par l’ajustement de cette courbe au modèle fickien théorique. Le présent document présente la meilleure application aux films monolithiques. Si des films multicouches sont utilisés, les valeurs de D et S sont uniquement des valeurs apparentes, mais les valeurs en régime établi peuvent tout de même être mesurées.
Merilni postopki za materiale, uporabljene v fotonapetostnih modulih - 6-2. del: Splošni preskusi - Preskušanje pronicanja vlage pri polimernih materialih
General Information
Standards Content (Sample)
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
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co–operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non–governmental organizations
liaising with the IEC also participate in this preparation. IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62788-6-2 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The text of this
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.