EN IEC 60068-2-21:2021

SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN 60068-2-21:2006
SIST EN 60068-2-77:2001
Okoljski preskusi - 2-21. del: Preskusi - Preskus U: Trdnost priključkov in celotnih
vgradnih naprav
Environmental testing - Part 2-21: Tests - Test U: Robustness of terminations and integral
mounting devices
Umweltprüfungen - Teil 2-21: Prüfungen - Prüfung U: Widerstandsfähigkeit der
Anschlüsse und integrierter Befestigungsmittel
Essais d'environnement - Partie 2-21: Essais - Essai U: Robustesse des sorties et des
dispositifs de montage incorporés
Ta slovenski standard je istoveten z: EN IEC 60068-2-21:2021
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
31.190 Sestavljeni elektronski Electronic component
elementi assemblies
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60068-2-21

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 19.040; 31.190 Supersedes EN 60068-2-21:2006, EN 60068-2-77:1999
and all of its amendments and corrigenda (if any)
English Version
Environmental testing - Part 2-21: Tests - Test U: Robustness of
terminations and integral mounting devices
(IEC 60068-2-21:2021)
Essais d'environnement - Partie 2-21: Essais - Essai U: Umgebungseinflüsse - Teil 2-21: Tests - Test U:
Robustesse des sorties et des dispositifs de montage Widerstandsfähigkeit der Anschlüsse und integrierter
incorporés Befestigungsmittel
(IEC 60068-2-21:2021) (IEC 60068-2-21:2021)
This European Standard was approved by CENELEC on 2021-08-12. 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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60068-2-21:2021 E

European foreword
The text of document 91/1732/FDIS, future edition 7 of IEC 60068-2-21, prepared by IEC/TC 91
“Electronics assembly technology” was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60068-2-21:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–05–12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–08–12
document have to be withdrawn
This document supersedes EN 60068-2-21:2006 and EN 60068-2-77:1999 and all of its amendments
and corrigenda (if any).
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60068-2-21:2021 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60068-2-61 NOTE Harmonized as EN 60068-2-61
IEC 60068-2-77:1999 NOTE Harmonized as EN 60068-2-77:1999 (not modified)
IEC 61190-1-3:2017 NOTE Harmonized as EN IEC 61190-1-3:2018 (not modified)
IEC 61249-2-22 NOTE Harmonized as EN 61249-2-22
IEC 61249-2-35 NOTE Harmonized as EN 61249-2-35
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
IEC 60068-1 2013 Environmental testing - Part 1: General EN 60068-1 2014
and guidance
IEC 60068-2-58 2015 Environmental testing - Part 2–58: Tests - EN 60068-2-58 2015
Test Td: Test methods for solderability,
resistance to dissolution of metallization
and to soldering heat of surface mounting
devices (SMD)
IEC 60194-2 - Printed boards design, manufacture and - -
assembly - Vocabulary - Part 2: Common
usage in electronic technologies as well as
printed board and electronic assembly
technologies
IEC 61191-2 - Printed board assemblies - Part 2: EN 61191-2 -
Sectional specification - Requirements for
surface mount soldered assemblies

IEC 60068-2-21 ®
Edition 7.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-21: Tests – Test U: Robustness of terminations and integral mounting

devices
Essais d’environnement –
Partie 2-21: Essais – Essai U: Robustesse des sorties et des dispositifs de

montage incorporés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040; 31.190 ISBN 978-2-8322-9999-9

– 2 – IEC 60068-2-21:2021 © IEC 2021
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Tests Ua: Robustness of terminals against axial stresses . 8
4.1 Object . 8
4.2 Application . 8
4.3 General description . 8
4.4 Preconditioning . 8
4.5 Initial measurements . 8
4.6 Test procedures . 9
4.6.1 Test Ua : Tensile . 9
4.6.2 Test Ua : Thrust . 10
4.7 Final measurements . 11
4.8 Information to be given in the relevant specification . 11
5 Tests Ub: Robustness of terminals against bending stresses . 11
5.1 Object . 11
5.2 Application . 12
5.2.1 General . 12
5.2.2 Pliable terminations . 12
5.2.3 Rigid and all other terminations . 12
5.3 General description . 13
5.4 Preconditioning . 14
5.5 Initial measurements . 14
5.6 Test procedures . 14
5.6.1 Test Ub (for wire and strip terminations). 14
5.6.2 Test Ub (for tag terminations) . 16
5.6.3 Test Ub Simultaneous bending . 17
5.7 Final measurements . 17
5.8 Information to be given in the relevant specification . 17
6 Test Uc: Torsion . 18
6.1 Object . 18
6.2 Application . 18
6.3 General description . 18
6.4 Preparation of the specimen . 18
6.5 Initial measurements . 18
6.6 Test procedure . 19
6.7 Final measurements . 20
6.8 Information to be given in the relevant specification . 20
7 Test Ud: Torque . 20
7.1 Object . 20
7.2 Application . 20
7.3 General description . 21
7.4 Preconditioning . 21
7.5 Initial measurements . 21

IEC 60068-2-21:2021 © IEC 2021 – 3 –
7.6 Test procedure . 21
7.6.1 Terminations with threaded studs or screws . 21
7.6.2 Other test configurations. 23
7.7 Final measurements . 23
7.8 Information to be given in the relevant specification . 23
8 Test Ue: Robustness of terminations for SMD in the mounted state . 24
8.1 Object . 24
8.2 Application . 24
8.3 Substrate for test method Ue . 24
8.4 Mounting . 26
8.4.1 Dimensions . 26
8.4.2 Possible mounting methods . 26
8.4.3 Mounting method for substrate bending, pull-off, push-off and shear . 26
8.5 Preconditioni
...