SIST EN 13523-7:2021

Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend test)

This part of EN 13523 specifies the procedure for determining the resistance to cracking of an organic coating on a metallic substrate when bent through 135° to 180°. The degree of adhesion may also be evaluated.
Both folding and mandrel methods are considered. The folding method is more often used for practical purposes but where more precise determinations are required, the mandrel method is recommended.
The cylindrical bend method may also be used for a pass/fail decision by using an agreed mandrel.
The choice of the appropriate test method is limited by the thickness and/or the hardness of the substrate.
The feasibility of the test depends on the type and thickness of the substrate. During the procedure, the mandrel should not deform.

Bandbeschichtete Metalle - Prüfverfahren - Teil 7: Widerstandsfähigkeit gegen Rissbildung beim Biegen (T-Biegeprüfung)

Dieses Dokument legt das Verfahren zum Bestimmen der Widerstandsfähigkeit gegen Rissbildung einer organischen Beschichtung auf einem metallischen Substrat fest, wenn dieses um 135° bis 180° gebogen wird. Die Haftfestigkeit kann ebenfalls bewertet werden.
Es werden sowohl Faltverfahren als auch Dornbiegeverfahren berücksichtigt. Das Faltverfahren wird häufiger für praktische Zwecke verwendet. Wenn jedoch genauere Bestimmungen gefordert werden, wird das Dornbiegeverfahren bevorzugt.
Das Dornbiegeverfahren mit zylindrischem Dorn kann auch für eine Ja/Nein-Entscheidung angewendet werden, indem ein vereinbarter Dorn verwendet wird.
Die Wahl des geeigneten Prüfverfahrens wird durch die Dicke und/oder die Härte des Substrates eingeschränkt.
Die Durchführbarkeit der Prüfung hängt von der Art und der Dicke des Substrates ab. Während der Durchführung ist nicht beabsichtigt, dass sich der Dorn verformt.

Tôles prélaquées - Méthodes d'essai - Partie 7: Résistance à la fissuration par pliage (essai de pliage en T)

Le présent document décrit le mode opératoire permettant de déterminer la résistance à la fissuration d’un revêtement organique appliqué sur un subjectile métallique lorsqu’il est plié selon un angle de 135° à 180°. Il est également possible d’évaluer le degré d’adhérence.
Les méthodes par pliage et au mandrin sont toutes deux prises en compte. Le pliage est, pour des raisons pratiques, la méthode la plus couramment utilisée. Cependant, pour des déterminations plus précises, la méthode au mandrin est préférée.
La méthode de pliage cylindrique avec un mandrin convenu peut également être appliquée afin de déterminer si un essai est satisfaisant ou non.
Le choix de la méthode d’essai appropriée est limité par l’épaisseur et/ou la dureté du subjectile.
La faisabilité de l’essai dépend du type et de l’épaisseur du subjectile. Le mandrin n’est pas destiné à se déformer pendant la mise en œuvre du mode opératoire.

Prevlečene kovine, ki se navijajo - Preskusne metode - 7. del: Odpornost proti pokanju pri upogibu (T-upogibni preskus)

General Information

• Status: Published
• Public Enquiry End Date: 02-Dec-2021
• Publication Date: 08-Nov-2021
• ICS: 17.040.20 - Properties of surfaces
• ICS: 25.220.60 - Organic coatings
• Technical Committee: IBLP - Paints and varnishes
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 22-Oct-2021
• Due Date: 27-Dec-2021
• Completion Date: 09-Nov-2021
• Ref Project: EN 13523-7:2021 - Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend test)

Relations

• Replaces: SIST EN 13523-7:2014 - Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend test)
• Effective Date: 01-Dec-2021
• Replaces: SIST EN 13523-7:2014 - Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend test)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 13523-7:2021
01-december-2021
Nadomešča:
SIST EN 13523-7:2014
Prevlečene kovine, ki se navijajo - Preskusne metode - 7. del: Odpornost proti
pokanju pri upogibu (T-upogibni preskus)
Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend
test)
Bandbeschichtete Metalle - Prüfverfahren - Teil 7: Widerstandsfähigkeit gegen
Rissbildung beim Biegen (T-Biegeprüfung)
Tôles prélaquées - Méthodes d'essai - Partie 7: Résistance à la fissuration par pliage
(essai de pliage en T)
Ta slovenski standard je istoveten z: EN 13523-7:2021
ICS:
17.040.20 Lastnosti površin Properties of surfaces
25.220.60 Organske prevleke Organic coatings
SIST EN 13523-7:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13523-7:2021

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SIST EN 13523-7:2021


EN 13523-7
EUROPEAN STANDARD

NORME EUROPÉENNE

October 2021
EUROPÄISCHE NORM
ICS 25.220.60 Supersedes EN 13523-7:2014
English Version

Coil coated metals - Test methods - Part 7: Resistance to
cracking on bending (T-bend test)
Tôles prélaquées - Méthodes d'essai - Partie 7: Bandbeschichtete Metalle - Prüfverfahren - Teil 7:
Résistance à la fissuration par pliage (essai de pliage en Widerstandsfähigkeit gegen Rissbildung beim Biegen
T) (T-Biegeprüfung)
This European Standard was approved by CEN on 16 August 2021.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13523-7:2021 E
worldwide for CEN national Members.

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SIST EN 13523-7:2021
EN 13523-7:2021 (E)
Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 5
5 Apparatus . 6
6 Sampling . 11
7 Test specimen . 12
8 Procedure. 12
8.1 General . 12
8.2 Methods for practical (industrial) use . 12
8.2.1 Folding method . 12
8.2.2 Mandrel method . 13
8.3 Method for laboratory purposes . 14
9 Expression of results . 14
10 Precision . 14
11 Test report . 14
Bibliography . 16
2

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SIST EN 13523-7:2021
EN 13523-7:2021 (E)
European foreword
This document (EN 13523-7:2021) has been prepared by Technical Committee CEN/TC 139 “Paints and
varnishes”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2022, and conflicting national standards shall be
withdrawn at the latest by April 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13523-7:2014.
The main changes are:
a) a requirement concerning the minimum width of the test specimen was added to Clause 7;
b) the list of the existing parts of EN 13523 has been updated;
c) the text has been editorially revised and the normative references have been updated.
The EN 13523 series, Coil coated metals — Test methods, consists of the following parts:
— Part 0: General introduction
— Part 1: Film thickness
— Part 2: Gloss
— Part 3: Colour difference and metamerism — Instrumental comparison
— Part 4: Pencil hardness
— Part 5: Resistance to rapid deformation (impact test)
— Part 6: Adhesion after indentation (cupping test)
— Part 7: Resistance to cracking on bending (T-bend test)
— Part 8: Resistance to salt spray (fog)
— Part 9: Resistance to water immersion
— Part 10: Resistance to fluorescent UV radiation and water condensation
— Part 11: Resistance to solvents (rubbing test)
— Part 12: Resistance to scratching
— Part 13: Resistance to accelerated ageing by the use of heat
— Part 14: Chalking (Helmen method)
3

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SIST EN 13523-7:2021
EN 13523-7:2021 (E)
— Part 16: Resistance to abrasion
— Part 17: Adhesion of strippable films
— Part 18: Resistance to staining
— Part 19: Panel design and method of atmospheric exposure testing
— Part 20: Foam adhesion
— Part 21: Evaluation of outdoor exposed panels
— Part 22: Colour difference — Visual comparison
— Part 23: Resistance to humid atmospheres containing sulfur dioxide
— Part 24: Resistance to blocking and pressure marking
— Part 25: Resistance to humidity
— Part 26: Resistance to condensation of water
— Part 27: Resistance to humid poultice (Cataplasm test)
— Part 29: Resistance to environmental soiling (Dirt pick-up and striping)
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
4

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SIST EN 13523-7:2021
EN 13523-7:2021 (E)
1 Scope
This document specifies the procedure for determining the resistance to cracking of an organic coating
on a metallic substrate when bent through 135° to 180°. The degree of adhesion can also be evaluated.
Both folding and mandrel methods are considered. The folding method is more often used for practical
purposes but where more precise determinations are required, the mandrel method is the preferred
method.
The cylindrical bend method can also be used for a pass/fail decision by using an agreed mandrel.
The choice of the appropriate test method is limited by the thickness and/or the hardness of the
substrate.
The feasibility of the test depends on the type and thickness of the substrate. During the procedure, the
mandrel is not intended to deform.
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.
EN 13523-0:2021, Coil coated metals - Test methods - Part 0: General introduction
EN 23270, Paints and varnishes and their raw materials - Temperatures and humidities for conditioning
and testing (ISO 3270)
EN 60454-2, Pressure-sensitive adhesive tapes for electrical purposes -
...

SLOVENSKI STANDARD
oSIST prEN 13523-7:2020
01-november-2020
Prevlečene kovine, ki se navijajo - Preskusne metode - 7. del: Odpornost proti
pokanju pri upogibu (T-upogibni preskus)
Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend
test)
Bandbeschichtete Metalle - Prüfverfahren - Teil 7: Widerstandsfähigkeit gegen
Rissbildung beim Biegen (T-Biegeprüfung)
Tôles prélaquées - Méthodes d'essai - Partie 7: Résistance à la fissuration par pliage
(essai de pliage en T)
Ta slovenski standard je istoveten z: prEN 13523-7
ICS:
17.040.20 Lastnosti površin Properties of surfaces
25.220.60 Organske prevleke Organic coatings
oSIST prEN 13523-7:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 13523-7:2020

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oSIST prEN 13523-7:2020


DRAFT
EUROPEAN STANDARD
prEN 13523-7
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2020
ICS 25.220.60 Will supersede EN 13523-7:2014
English Version

Coil coated metals - Test methods - Part 7: Resistance to
cracking on bending (T-bend test)
Tôles prélaquées - Méthodes d'essai - Partie 7: Bandbeschichtete Metalle - Prüfverfahren - Teil 7:
Résistance à la fissuration par pliage (essai de pliage en Widerstandsfähigkeit gegen Rissbildung beim Biegen
T) (T-Biegeprüfung)
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 139.

If this draft becomes a European Standard, CEN 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13523-7:2020 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
oSIST prEN 13523-7:2020
prEN 13523-7:2020 (E)
Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 5
5 Apparatus . 6
6 Sampling . 12
7 Test specimen . 12
8 Procedure. 12
8.1 General . 12
8.2 Methods for practical (industrial) use . 12
8.2.1 Folding method . 12
8.2.2 Mandrel method . 14
8.3 Method for laboratory purposes . 14
9 Expression of results . 14
10 Precision . 14
11 Test report . 15
Bibliography . 16

2

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oSIST prEN 13523-7:2020
prEN 13523-7:2020 (E)
European foreword
This document (prEN 13523-7:2020) has been prepared by Technical Committee CEN/TC 139 “Paints
and varnishes”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13523-7:2014.
The main changes are:
a) a requirement concerning the minimum width of the test specimen was added to Clause 7;
b) the list of the existing parts of EN 13523 has been updated;
c) the text has been editorially revised and the normative references have been updated.
The EN 13523 series, Coil coated metals — Test methods, consists of the following parts:
— Part 0: General introduction
— Part 1: Film thickness
— Part 2: Gloss
— Part 3: Colour difference and metamerism — Instrumental comparison
— Part 4: Pencil hardness
— Part 5: Resistance to rapid deformation (impact test)
— Part 6: Adhesion after indentation (cupping test)
— Part 7: Resistance to cracking on bending (T-bend test)
— Part 8: Resistance to salt spray (fog)
— Part 9: Resistance to water immersion
— Part 10: Resistance to fluorescent UV radiation and water condensation
— Part 11: Resistance to solvents (rubbing test)
— Part 12: Resistance to scratching
— Part 13: Resistance to accelerated ageing by the use of heat
— Part 14: Chalking (Helmen method)
— Part 16: Resistance to abrasion
— Part 17: Adhesion of strippable films
3

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oSIST prEN 13523-7:2020
prEN 13523-7:2020 (E)
— Part 18: Resistance to staining
— Part 19: Panel design and method of atmospheric exposure testing
— Part 20: Foam adhesion
— Part 21: Evaluation of outdoor exposed panels
— Part 22: Colour difference — Visual comparison
— Part 23: Resistance to humid atmospheres containing sulfur dioxide
— Part 24: Resistance to blocking and pressure marking
— Part 25: Resistance to humidity
— Part 26: Resistance to condensation of water
— Part 27: Resistance to humid poultice (Cataplasm test)
— Part 29: Resistance to environmental soiling (Dirt pick-up and striping)
4

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oSIST prEN 13523-7:2020
prEN 13523-7:2020 (E)
1 Scope
This document specifies the procedure for determining the resistance to cracking of an organic coating
on a metallic substrate when bent through 135° to 180°. The degree of adhesion can also be evaluated.
Both folding and mandrel methods are considered. The folding method is more often used for practical
purposes but where more precise determinations are required, the mandrel method is the preferred
method.
The cylindrical bend method can also be used for a pass/fail decision by using an agreed mandrel.
The choice of the appropriate test method is limited by the thickness and/or the hardness of the
substrate.
The feasibility of the test depends on the type and thickness of the substrate. During the procedure, the
mandrel is not intended to deform.
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.
EN 13523-0, Coil coated metals - Test methods - Part 0: General introduction
EN 23270, Paints and varnishes and their raw materials - Temperatures and humidities for conditioning
and testing (ISO 3270)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13523-0 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
metal thickness
total thickness of the substrate including any metallic coating and
...