Environmental testing - Part 2-21: Tests - Test U: Robustness of terminations and integral mounting devices

This document specifies two separate methods for determining the resistance of a material to wet and
dry abrasion.
It is applicable to the coated surface or surfaces of coated fabrics.
It does not apply to determining the abrasion behaviour of an uncoated surface of a coated fabric, for
which the methods for uncoated textiles described in the ISO 12947 series apply.

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

L’IEC 60068-2-21:2021 s’applique à tous les composants électriques et électroniques dont les sorties ou les dispositifs de montage incorporés sont susceptibles d’être soumis à des contraintes au cours des opérations normales de montage ou de manipulation, et elle s’applique également aux composants pour montage en surface (CMS). Cette septième édition annule et remplace la sixième édition, parue en 2006, et l’IEC 60068‑2‑77:1999. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  intégration des parties de l’IEC 60068-2-77 (voir l’Annexe X). L’IEC 60068-2-77 a été retirée après la publication du présent document; l’Annexe X a été ajoutée pour montrer la corrélation des articles et des paragraphes de la présente édition de l’IEC 60068-2-21 avec ceux de l’IEC 60068-2-21:2006 et de l’IEC 60068-2-77:1999.

Okoljski preskusi - 2-21. del: Preskusi - Preskus U: Trdnost priključkov in celotnih vgradnih naprav

General Information

Status
Published
Publication Date
26-Sep-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
14-Sep-2021
Due Date
19-Nov-2021
Completion Date
27-Sep-2021

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SLOVENSKI STANDARD
SIST EN IEC 60068-2-21:2021
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
SIST EN IEC 60068-2-21:2021 en

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

---------------------- Page: 1 ----------------------
SIST EN IEC 60068-2-21:2021
---------------------- Page: 2 ----------------------
SIST EN IEC 60068-2-21:2021
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
---------------------- Page: 3 ----------------------
SIST EN IEC 60068-2-21:2021
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
---------------------- Page: 4 ----------------------
SIST EN IEC 60068-2-21:2021
EN IEC 60068-2-21:2021 (E)
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
---------------------- Page: 5 ----------------------
SIST EN IEC 60068-2-21:2021
---------------------- Page: 6 ----------------------
SIST EN IEC 60068-2-21:2021
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 60068-2-21:2021
– 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

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SIST EN IEC 60068-2-21:2021
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 Preconditioning ..................................................................................................... 27

8.6 Initial measurements ............................................................................................. 27

8.7 Test methods ........................................................................................................ 27

8.7.1 Test Ue : Substrate bending test ................................................................... 27

8.7.2 Test Ue : Pull-off and push-off test ................................................................ 28

8.7.3 Test Ue : Shear test ...................................................................................... 30

8.8 Final measurements .............................................................................................. 32

8.8.1 Recovery ....................................................................................................... 32

8.8.2 Visual examination of terminations ................................................................ 32

8.8.3 Electrical characteristics ................................................................................ 32

8.8.4 Hidden defect ................................................................................................ 32

8.9 Information to be given in the relevant specification .............................................. 32

9 Test Uf: Robustness of component body ........................................................................ 34

9.1 Object ................................................................................................................... 34

9.2 Application ............................................................................................................ 34

9.3 General description ............................................................................................... 34

9.4 Preconditioning ..................................................................................................... 34

9.5 Initial measurement .............................................................................................. 34

9.6 Test procedure ...................................................................................................... 34

9.6.1 Test Uf : Body strength ................................................................................. 34

9.6.2 Test Uf : Impact shock .................................................................................. 36

9.7 Final measurements .............................................................................................. 38

9.7.1 Recovery ....................................................................................................... 38

9.7.2 Visual examination ........................................................................................ 39

9.7.3 Electrical characteristics ................................................................................ 39

9.7.4 Hidden defect ................................................................................................ 39

9.8 Information to be given in the relevant specification .............................................. 39

Annex X (informative) Cross-reference for references to the previous editions of this

document .............................................................................................................................. 40

X.1 Cross-reference for references to the previous edition of IEC 60068‑2‑21 ............. 40

X.2 Cross-reference for references to the last edition of IEC 60068‑2‑77 .................... 41

Bibliography .......................................................................................................................... 43

Figure 1 – Direction of the applied pull force F in test Ua ..................................................... 9

p 1
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SIST EN IEC 60068-2-21:2021
– 4 – IEC 60068-2-21:2021 © IEC 2021

Figure 2 – Direction of the applied thrust F in test Ua ......................................................... 10

t 2

Figure 3 – Displacement of pliable lead wires in test Ub ....................................................... 12

Figure 4 – Bending force applied to a specimen with non-pliable terminations ...................... 13

Figure 5 – Sequential test procedure of test Ub, Method 1 .................................................... 15

Figure 6 – Sequential test procedure of test Ub, Methods 2 and 3......................................... 16

Figure 7 – Clamp for the testing of short terminations ........................................................... 17

Figure 8 – Preparatory bending of a lead wire for test Uc ...................................................... 18

Figure 9 – Torsion test method 1: Rotation of clamped specimen body ................................. 19

Figure 10 – Torsion test method 2: Rotation of clamped other lead wire................................ 20

Figure 11 – Assembly for the torque test applied to a threaded stud ..................................... 22

Figure 12 – Preparation of a threaded termination for the torque test .................................... 22

Figure 13 – Assembly for the torque test applied to an embedded nut ................................... 23

Figure 14 – Example of substrate for test method Ue ............................................................ 25

Figure 15 – Substrate bending test ....................................................................................... 28

Figure 16 – Test Ue , pull-off test ......................................................................................... 29

Figure 17 – Test Ue , push-off test ....................................................................................... 30

Figure 18 – Test Ue , shear test ........................................................................................... 31

Figure 19 – SMD Body strength test Uf applied to a rectangular specimen .......................... 35

Figure 20 – SMD Body strength test Uf applied to a MELF specimen .................................. 36

Figure 21 – Example of an apparatus for test Uf .................................................................. 37

Figure 22 – Example of a piston ............................................................................................ 37

Figure 23 – Examples of the application of the SMD Body impact shock test Uf .................. 38

Table 1 – Selection of test methods suitable for specific terminations/leads ............................ 7

Table 2 – Value of applied pull force for test Ua .................................................................. 10

Table 3 – Value of applied thrust for test Ua ........................................................................ 11

Table 4 – Value of applied force for test Ub .......................................................................... 13

Table 5 – Torque severity ..................................................................................................... 21

Table X.1 – Cross-reference to clauses ................................................................................ 40

Table X.2 – Cross-reference to figures .................................................................................. 41

Table X.3 – Cross reference to tables ................................................................................... 41

Table X.4 – Cross-reference to clauses ................................................................................ 42

Table X.5 – Cross-reference to figures .................................................................................. 42

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SIST EN IEC 60068-2-21:2021
IEC 60068-2-21:2021 © IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
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 60068-2-21 has been prepared by IEC technical committee 91:

Electronics assembly technology.

This seventh edition cancels and replaces the sixth edition, published in 2006, and

IEC 60068-2-77:1999. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) integration of parts of IEC 60068-2-77 (see Annex X); IEC 60068-2-77 is withdrawn with the

publication of this document;

b) Annex X is added to show the correlation of the clauses and subclauses in this edition of

IEC 60068-2-21 with the clauses in IEC 60068-2-21:2006 and IEC 60068-2-77:1999.
---------------------- Page: 11 ----------------------
SIST EN IEC 60068-2-21:2021
– 6 – IEC 60068-2-21:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
91/1732/FDIS 91/1742/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A complete list of all parts comprising the IEC 60068 series, under the general title

Environmental testing, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 12 ----------------------
SIST EN IEC 60068-2-21:2021
IEC 60068-2-21:2021 © IEC 2021 – 7 –
ENVIRONMENTAL TESTING –
Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
1 Scope

This part of IEC 60068 is applicable to all electrical and electronic components whose

terminations or integral mounting devices are liable to be submitted to stresses during normal

assembly or handling operations and is also applicable to surface mount devices (SMDs).

The recommended test methods suitable for specific terminations/lead of devices are shown in

Table 1.
Table 1 – Selection of test methods suitable for specific terminations/leads
Test method Component Mounted/not See Clause
mounted
Test Type
Ua Tensile Leaded devices Not mounted Clause 4
Ua Thrust Leaded devices Not mounted Clause 4
Ub Bending Leaded devices Not mounted Clause 5
Uc Torsion Leaded devices Not mounted Clause 6
Ud Torque Threaded stud, screw or Not mounted Clause 7
other terminations
Ue Substrate Surface mount devices Mounted Clause 8
bending
Ue Pull/push Surface mount devices Mounted Clause 8
Ue Shear Surface mount devices Mounted Clause 8
Uf Body Surface mount devices Not mounted Clause 9
strength
Impact
Uf Surface mount devices Not mounted Clause 9
shock
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.
IEC 60068-1:2013, Environmental testing –
...

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