EN 60068-2-21:2006

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

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.

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

La CEI 60068-2-21:2006 est applicable 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. La présente édition inclut les modifications techniques significatives suivantes par rapport à l'édition antérieure: - Ajout de la sévérité du couple pour le diamètre nominal du filetage de 8 mm à l'Essai Ud: essai de couple, conformément à la CEI 60252-2 (voir le tableau 5); - Modification de la spécification du substrat et de la méthode de montage décrivant l'alliage à braser sans plomb, à l'Essai Ue (voir la Figure 5 et le 8.3.3 et al.); - Modification du gabarit d'essai et des conditions d'essai concernant l'Essai Ue1: essai de pliage du substrat (voir la Figure 7 et al.); - Modification de la force de poussée passant de 10 N à 5 N dans l'Essai Ue3: essai de cisaillement (voir le 8.5.3.2). Le contenu du corrigendum de janvier 2012 a été pris en considération dans cet exemplaire.

Okoljski preskusi - 2-21. del: Preskusi - Preskus U: Trdnost priključkov in celotnih vgradnih naprav (IEC 60068-2-21:2006)

General Information

• Status: Published
• Publication Date: 19-Jul-2006
• Withdrawal Date: 30-Jun-2009
• ICS: 19.040 - Environmental testing
• ICS: 31.190 - Electronic component assemblies
• Technical Committee: CLC/SR 91 - Electronics assembly technology
• Drafting Committee: IEC/TC 91 - IEC_TC_91
• Parallel Committee: IEC/TC 91 - IEC_TC_91
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 20-Jul-2006
• Completion Date: 20-Jul-2006
• Ref Project: SIST EN 60068-2-21:2006 - Environmental testing -- Part 2-21: Tests - Test U: Robustness of terminations and integral mounting devices

Relations

• Replaces: EN 60068-2-21:1999 - Environmental testing - Part 2-21: Tests - Test U: Robustness of terminations and integral mounting devices
• Effective Date: 28-Jan-2023
• Replaced By: EN IEC 60068-2-21:2021 - Environmental testing - Part 2-21: Tests - Test U: Robustness of terminations and integral mounting devices
• Effective Date: 26-Jan-2023

Standards Content (Sample)

6/29(16., 6,67(1

67$1'$5'
GHFHPEHU
2NROMVNLSUHVNXVLGHO3UHVNXVL3UHVNXV87UGQRVWSULNOMXþNRYLQ
FHORWQLKYJUDGQLKQDSUDY,(&
(QYLURQPHQWDOWHVWLQJ3DUW7HVWV7HVW85REXVWQHVVRIWHUPLQDWLRQVDQG
LQWHJUDOPRXQWLQJGHYLFHV,(&
,&6 5HIHUHQþQDãWHYLOND

6,67(1HQ
!"#$%&’( )&!*+,%- .
EUROPEAN STANDARD
EN 60068-2-21
NORME EUROPÉENNE
July 2006
EUROPÄISCHE NORM
ICS 19.040; 31.190 Supersedes EN 60068-2-21:1999

English version
Environmental testing
Part 2-21: Tests -
Test U: Robustness of terminations and integral mounting devices
(IEC 60068-2-21:2006)
Essais d'environnement  Umweltprüfungen
Partie 2-21: Essais - Teil 2-21: Prüfungen -
Essai U: Robustesse des sorties et Prüfung U: Widerstandsfähigkeit der
des dispositifs de montage incorporés Anschlüsse und integrierter
(CEI 60068-2-21:2006) Befestigungsmittel
(IEC 60068-2-21:2006)
This European Standard was approved by CENELEC on 2006-07-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60068-2-21:2006 E
Foreword
The text of document 91/582/FDIS, future edition 6 of IEC 60068-2-21, prepared by IEC TC 91,
Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60068-2-21 on 2006-07-01.
This European Standard supersedes EN 60068-2-21:1999.
It includes the following significant technical changes with respect to EN 60068-2-21:1999
– addition of torque severity for nominal thread diameter of 8 mm in Test Ud: torque in accordance with
IEC 60252-2 (see Table 5);
– modification of substrate specification and mounting method describing lead-free solder in Test Ue
(see Figure 5 and 8.3.3 et al.);
– modification of test jig and test condition in Test Ue : substrate bending test (see Figure 7 et al.);
– change of pushing force from 10 N to 5 N in Test Ue : shear test (see 8.5.3.2).
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60068-2-21:2006 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60068-2-21:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60068-1 1988 Environmental testing
+ corr. October 1988 Part 1: General and guidance
+ A1 1992 EN 60068-1 1994
IEC 60068-2-20 1979 Environmental testing
+ A2 1987 Part 2: Tests - Test T: Soldering HD 323.2.20 S3 1988

IEC 60068-2-58 2004 Environmental testing EN 60068-2-58 2004
Part 2-58: Tests - Test Td: Test methods for + corr. December 2004
solderability, resistance to dissolution of
metallization and to soldering heat of surface
mounting devices (SMD)
IEC 60068-2-61 1991 Environmental testing EN 60068-2-61 1993
Part 2: Test methods - Test Z/ABDM: Climatic
sequence
IEC 61249-2-7 2002 Materials for printed boards and other EN 61249-2-7 2002
interconnecting structures + corr. September 2005
Part 2-7: Reinforced base materials, clad and
unclad - Epoxide woven E-glass laminated
sheet of defined flammability (vertical burning
test), copper-clad
IEC 61188-5 Series Printed boards and printed board EN 61188-5 Series
assemblies - Design and use
IEC 61190-1-2 2002 Attachment materials for electronic assembly EN 61190-1-2 2002
Part 1-2: Requirements for solder pastes for
high-quality interconnections in electronics
assembly
IEC 61191-2 1998 Printed board assemblies EN 61191-2 1998
Part 2: Sectional specification - Requirements
for surface mount soldered assemblies

ISO 272 1982 Fasteners - Hexagon Products - Width across - -
flats
ISO 9453 1990 Soft solder alloys - Chemical compositions EN 29453 1993
and forms
INTERNATIONAL IEC
STANDARD 60068-2-21
Sixth edition
2006-06
Environmental testing –
Part 2-21:
Tests – Test U: Robustness of terminations
and integral mounting devices
 IEC 2006  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale U
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60068-2-21  IEC:2006(E)
CONTENTS
FOREWORD.4

1 Scope.6
2 Normative references .6
3 Test Ua : tensile .7
3.1 Object .7
3.2 General description .7
3.3 Preconditioning .7
3.4 Initial measurements .7
3.5 Test method .7
3.6 Final measurements .8
3.7 Information to be given in the relevant specification .8
4 Test Ua : thrust.9
4.1 Object .9
4.2 General description .9
4.3 Preconditioning .9
4.4 Initial measurements .9
4.5 Test method .9
4.6 Final measurements .10
4.7 Information to be given in the relevant specification .10
5 Test Ub: bending .10
5.1 Object .10
5.2 General description .11
5.3 Preconditioning .11
5.4 Initial measurements .11
5.5 Test method .11
5.6 Final measurements .13
5.7 Information to be given in the relevant specification .14
6 Test Uc: torsion .14
6.1 Object .14
6.2 Preconditioning .14
6.3 Initial measurements .14
6.4 Test method .14
6.5 Final measurements .15
6.6 Information to be given in the relevant specification .15
7 Test Ud: torque .15
7.1 Object .15
7.2 General description .15
7.3 Preconditioning .15
7.4 Initial measurements .15
7.5 Test method .16
7.6 Final measurements .16
7.7 Information to be given in the relevant specification .16

60068-2-21  IEC:2006(E) – 3 –
8 Test Ue: robustness of terminations for SMD in the mounted state .17
8.1 Object .17
8.2 General description .17
8.3 Mounting .18
8.4 Initial measurements .19
8.5 Test methods .19
8.6 Final measurements .21
8.7 Information to be given in the relevant specification .22

Figure 1 – Clamp for the testing of short terminations .13
Figure 2 – Sketches showing direction by arrow heads of application of forces
Test Ua : tensile and test Ua : thrust.23
1 2
Figure 3 – Sketches showing test procedure for test Ub: bending (see 5.5.2.1 and 5.5.2.3) .24
Figure 4 – Diagrams showing test procedure for test Uc: torsion test for wire terminations.25
Figure 5 – Example of substrate for test method Ue (also suitable for electrical test).26
Figure 6 – Example of substrate for test methods Ue and Ue
2 3
(also suitable for electrical test) .26
Figure 7 – Bending jig for test Ue .27
Figure 8 – Example of a push-off test substrate .27
Figure 9 – Force test Ue – pull-off .28
Figure 10 – Example of a force application pushing tool for test Ue – push-off .28
Figure 11 – Example of the shear (adhesion) test – Ue .28
Table 1 – Application .
...