EN IEC 60068-2-20:2021

SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST EN 60068-2-20:2009
Okoljski preskusi - 2-20. del: Preskusi - Preskusa Ta in Tb: Preskusne metode za
določanje spajkljivosti in odpornosti proti toploti spajkanja za komponente z
izvodi
Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and
resistance to soldering heat of devices with leads
Umgebungseinflüsse - Teil 2-20: Prüfungen - Prüfung T: Prüfverfahren für die Lötbarkeit
und Lötwärmebeständigkeit von Bauelementen mit herausgeführten Anschlüssen
Essais d'environnement - Partie 2-20: Essais - Essai T: Méthodes d'essai de la
brasabilité et de la résistance à la chaleur de brasage des dispositifs à broches
Ta slovenski standard je istoveten z: EN IEC 60068-2-20:2021
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60068-2-20

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2021
ICS 19.040 Supersedes EN 60068-2-20:2008 and all of its
amendments and corrigenda (if any)
English Version
Environmental testing - Part 2-20: Tests - Test Ta and Tb: Test
methods for solderability and resistance to soldering heat of
devices with leads
(IEC 60068-2-20:2021)
Essais d'environnement - Partie 2-20: Essais - Essais Ta et Umgebungseinflüsse - Teil 2-20: Prüfungen - Prüfung Ta
Tb: Méthodes d'essai de la brasabilité et de la résistance à und Tb: Prüfverfahren für die Lötbarkeit und
la chaleur de brasage des dispositifs à broches Lötwärmebeständigkeit von Bauelementen mit
(IEC 60068-2-20:2021) herausgeführten Anschlüssen
(IEC 60068-2-20:2021)
This European Standard was approved by CENELEC on 2021-05-04. 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 60068-2-20:2021 E

European foreword
The text of document 91/1701/FDIS, future edition 6 of IEC 60068-2-20, prepared by IEC/TC 91
"Electronics assembly technology" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60068-2-20:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-02-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-05-04
document have to be withdrawn
This document supersedes EN 60068-2-20:2008 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.
Endorsement notice
The text of the International Standard IEC 60068-2-20:2021 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 60068-2-58 NOTE Harmonized as EN 60068-2-58
IEC 60068-2-69:2017 NOTE Harmonized as EN 60068-2-69:2017 (not modified)
IEC 61190-1-3:2017 NOTE Harmonized as EN IEC 61190-1-3:2018 (not modified)
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 - Environmental testing - Part 1: General EN 60068-1 -
and guidance
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-66 - Environmental testing - Part 2: Test EN 60068-2-66 -
methods - Test Cx: Damp heat, steady
state (unsaturated pressurized vapour)
IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - EN 60068-2-78 -
Test Cab: Damp heat, steady state
IEC 61191-3 - Printed board assemblies - Part 3: EN 61191-3 -
Sectional specification - Requirements
for through-hole mount soldered
assemblies
IEC 61191-4 - Printed board assemblies - Part 4: EN 61191-4 -
Sectional specification - Requirements
for terminal soldered assemblies

IEC 60068-2-20 ®
Edition 6.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-20: Tests – Tests Ta and Tb: Test methods for solderability and

resistance to soldering heat of devices with leads

Essais d’environnement –
Partie 2-20: Essais – Essais Ta et Tb: Méthodes d'essai de la brasabilité

et de la résistance à la chaleur de brasage des dispositifs à broches

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-9585-4

– 2 – IEC 60068-2-20:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test Ta: Solderability of wire and tag terminations . 8
4.1 Objective and general description of the test . 8
4.1.1 Test methods . 8
4.1.2 Specimen preparation . 8
4.1.3 Initial measurements . 9
4.1.4 Preconditioning . 9
4.2 Method 1: Solder bath . 10
4.2.1 General . 10
4.2.2 Description of the solder bath . 10
4.2.3 Flux . 10
4.2.4 Procedure . 10
4.2.5 Test conditions . 11
4.2.6 Final measurements and requirements . 11
4.3 Method 2: Soldering iron at 350 °C . 11
4.3.1 General . 11
4.3.2 Description of soldering irons . 11
4.3.3 Solder and flux . 12
4.3.4 Procedure . 12
4.3.5 Final measurements and requirements . 13
4.4 Information to be given in the relevant specification . 13
5 Test Tb: Resistance to soldering heat . 14
5.1 Objective and general description of the test . 14
5.1.1 Test methods . 14
5.1.2 Initial measurements . 14
5.2 Method 1: Solder bath . 14
5.2.1 Description of the solder bath . 14
5.2.2 Flux . 14
5.2.3 Procedure . 14
5.2.4 Test conditions . 15
5.2.5 De-wetting . 15
5.3 Method 2: Soldering iron . 16
5.3.1 Description of soldering iron . 16
5.3.2 Solder and flux . 16
5.3.3 Procedure . 16
5.4 Recovery . 16
5.5 Final measurements and requirements . 16
5.6 De-wetting (if required) . 16
5.7 Information to be given in the relevant specification . 17
Annex A (informative) Example of apparatus for steam conditioning process . 18
Annex B (normative) Specification for flux constituents . 19
B.1 Colophony . 19
B.2 2-propanol (isopropyl alcohol) . 19

IEC 60068-2-20:2021 © IEC 2021 – 3 –
B.3 Ethyl alcohol . 19
B.4 Flux composition . 19
Bibliography . 21

Figure 1 – Diagram of contact angle . 7
Figure 2 – Position of soldering iron . 12
Figure A.1 – Example of apparatus . 18

Table 1 – Solderability, solder bath method: Test severities (duration and temperature) . 11
Table 2 – Resistance to soldering heat, solder bath method: Test severities (duration
and temperature) . 15
Table B.1 – Colophony based flux compositions . 20

– 4 – IEC 60068-2-20:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-20: Tests –
Tests Ta and Tb: Test methods for solderability
and resistance to soldering
...