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

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.

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
30-Nov-2006
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Dec-2006
Due Date
01-Dec-2006
Completion Date
01-Dec-2006

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---------------------- Page: 1 ----------------------
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
---------------------- Page: 2 ----------------------
EN 60068-2-21:2006 - 2 -
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.
__________
---------------------- Page: 3 ----------------------
- 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
---------------------- Page: 4 ----------------------
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: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

PRICE CODE
Commission Electrotechnique Internationale U
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
---------------------- Page: 5 ----------------------
– 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

---------------------- Page: 6 ----------------------
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 ..............................................................................................................6

Table 2 – Value of applied force for test Ua ...........................................................................8

Table 3 – Value of applied force for test Ua .........................................................................10

Table 4 – Value of applied force for test Ub ..........................................................................12

Table 5 – Torque severity .....................................................................................................16

---------------------- Page: 7 ----------------------
– 4 – 60068-2-21  IEC:2006(E)
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 sixth edition cancels and replaces the fifth edition, published in 1999, and constitutes a

technical revision.

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

edition

– 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.)
---------------------- Page: 8 ----------------------
60068-2-21  IEC:2006(E) – 5 –

– 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 text of this standard is based on the following documents:
FDIS Report on voting
91/582/FDIS 91/607/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 publication will remain unchanged until

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

the data related to the specific publication. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 9 ----------------------
– 6 – 60068-2-21  IEC:2006(E)
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.
Table 1 provides details of the applicable tests.
Table 1 – Application
Test Type Component Mounted/not mounted
Ua Tensile Leaded devices Not mounted
Ua Thrust Leaded devices Not mounted
Ub Bending Leaded devices Not mounted
Uc Torsion Leaded devices Not mounted
Ud Torque Threaded stud or screw termination Not mounted
Ue Bending Surface mounted devices Mounted
Ue Pull/push Surface mounted devices Mounted
Ue Shear Surface mounted devices Mounted
2 Normative references

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.
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
IEC 60068-2-20:1979, Environmental testing – Part 2: Tests – Test T: Soldering
Amendment 2 (1987)

IEC 60068-2-58:2004, Environmental testing – Part 2-58: Tests – Test Td – Test methods for

solderability, resistance to dissolution of metallization and to soldering heat of surface

mounting devices (SMD)

IEC 60068-2-61:1991, Environmental testing – Part 2: Tests – Test Z/ABDM: Climatic sequence

IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures –

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 (all parts), Printed boards and printed board assemblies – Design and use

IEC 61190-1-2:2002, Attachment materials for electronic assembly – Part 1-2: Requirements

for soldering pastes for high quality interconnections in electronics assembly
---------------------- Page: 10 ----------------------
60068-2-21  IEC:2006(E) – 7 –

IEC 61191-2:1998, Printed board assemblies – Part 2: Sectional specification – Requirements

for surface mount soldered assemblies
ISO 272:1982, Fasteners – Hexagon products – Widths across flats
ISO 9453:1990, Soft solder alloys – Chemical compositions and forms
3 Test Ua : tensile
This test is applicable to all types of terminations.
3.1 Object

The purpose of this test is to verify that the terminations and attachment of the terminations to

the body of the component will withstand such axial stresses as are likely to be applied during

normal assembly or handling operations.
3.2 General description

With the termination in its normal position and the component held by its body, a force is

applied to the termination in the direction of its axis and acting in a direction away from the

body of the component. The force shall be applied progressively (without any shock) and then

maintained for a period of 10 s ± 1 s.
3.3 Preconditioning

The method of preconditioning shall be as prescribed in the relevant specification.

3.4 Initial measurements

The specimen shall be visually inspected and electrically and mechanically checked, as

required by the relevant specification.
3.5 Test method

Unless otherwise specified in the relevant specification, the test method shall be as follows:

Refer to Figure 2a.
3.5.1 Application

This test applies to all types of terminations. It shall be carried out on all the terminations,

except where a component has more than three terminations, in which case the specification

shall state the number of terminations per component to be tested. The test shall be carried

out in such a manner that all the terminations of the component have an equal probability of

being subjected to test.
3.5.2 Procedure

With the termination in its normal position and the component held by its body, a force with a

value as stated in Table 2 shall be applied to the termination in the direction of its axis and

acting in a direction away from the body of the component. The force shall be applied

progressively (without any shock) and then maintained for a period of 10 s ± 1 s.

---------------------- Page: 11 ----------------------
– 8 – 60068-2-21  IEC:2006(E)
The value of the applied force is as follows:
a) Wire terminations (circular section or strip) or pins
The value of the force applied shall be that indicated in Table 2.

Insulated wires shall be stripped of the insulation at the point at which the load is applied.

Stranded wires shall be united mechanically at the point of application of the load (such as

by soldering or knotting), prior to the application of the load. Where the technical features

of insulated or stranded wires may give rise to difficulties during the stripping, joining or

knotting operations and be liable to cause dispute for the test results, such operations

shall be in accordance with the relevant specification or, where necessary, with the

instructions of the component manufacturer.
Table 2 – Value of applied force for test Ua

Nominal cross-sectional area (S) Corresponding diameter (d) for Force with tolerance of ±10 %

circular-section wires
mm mm N
s ≤ 0,05 d ≤ 0,25 1
0,05 < s ≤ 0,10 0,25 < d ≤ 0,35 2,5
0,10 < s ≤ 0,20 0,35 < d ≤ 0,50 5
0,20 < s ≤ 0,50 0,50 < d ≤ 0,80 10
0,50 < s ≤ 1,20 0,80 < d ≤ 1,25 20
s > 1,20 d > 1,25 40

For circular-section wires, strips or pins, the nominal cross-sectional area is equal to the value calculated

from the nominal dimension(s) given in the relevant specification. For stranded wires, the nominal cross-

sectional area is obtained by taking the sum of the cross-sectional areas of the individual strands of the

conductor specified in the relevant specification.

b) Other terminations (tag terminations, threaded studs, screws, terminals, etc.)

The value of the force to be applied shall be given in the relevant specification.

3.6 Final measurements

The specimen shall be visually inspected and electrically and mechanically checked, as

required by the relevant specification.
3.7 Information to be given in the relevant specification
Subclause
a) Method of preconditioning 3.3
b) Initial measurements 3.4
c) Number of terminations to be tested, if more than three 3.5.1
d) Force (for oversized and other terminations) 3.5.2
e) Details of stripping, joining or knotting operations, if necessary 3.5.2
f) Final measurements 3.6
---------------------- Page: 12 ----------------------
60068-2-21  IEC:2006(E) – 9 –
4 Test Ua : thrust
4.1 Object

The purpose of this test is to verify that the terminations and attachment of the terminations to

the body of the component will withstand such thrusts as are likely to be applied during

normal assembly or handling operations. This test applies only to specimens of small

dimensions and of low mass, to the exclusion of equipment and assemblies.

NOTE This test does not apply to flexible terminations. The tests for flexible terminations are given in a) and b)

of 5.1.
4.2 General description

With the termination in its normal position and the component held by its body, thrust is

applied to the termination as close as possible to the body of the component, but leaving a

clear 2 mm of wire between the body of the component and the nearest point of the device

applying the force. The force shall be applied progressively (without any shock) and then

maintained for a period of 10 s ± 1 s.
4.3 Preconditioning

The method of preconditioning shall be as prescribed in the relevant specification.

4.4 Initial measurements

The specimen shall be visually inspected and electrically and mechanically checked, as

required by the relevant specification.
4.5 Test method
Refer to Figure 2b.
4.5.1 Application

The relevant specification shall state whether this test is applicable. When applicable, it shall

be carried out on all the terminations, except where a component has more than three

terminations, in which case the specification shall state the number of terminations per

component to be tested. The test shall be carried out in such a manner that all the

terminations of the component have an equal probability of being subjected to test. The

relevant specification shall define the direction of applied force.
4.5.2 Procedure

With the termination in its normal position and the component held by its body, thrust shall be

applied to the termination as close as possible to the body of the component, but leaving a

clear 2 mm of wire between the body of the component and the nearest point of the device

applying the force. The force shall be applied progressively (without any shock) and then

maintained for a period of 10 s ± 1 s.
The value of the applied force is as follows:
a) Wire terminations (circular-section or strip) or pins
The value of the force applied shall be as given in Table 3.
---------------------- Page: 13 ----------------------
– 10 – 60068-2-21  IEC:2006(E)
Table 3 –
...

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