EN 13523-21:2024

SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN 13523-21:2017
Prevlečene kovine, ki se navijajo - Preskusne metode - 21. del: Vrednotenje
preskušancev, izpostavljenih zunanjemu okolju
Coil coated metals - Test methods - Part 21: Evaluation of outdoor exposed panels
Bandbeschichtete Metalle - Prüfverfahren - Teil 21: Bewertung von freibewitterten
Probenplatten
Tôles prélaquées - Méthodes d'essai - Partie 21 : Évaluation des panneaux exposés en
extérieur
Ta slovenski standard je istoveten z: EN 13523-21:2024
ICS:
17.040.20 Lastnosti površin Properties of surfaces
25.220.60 Organske prevleke Organic coatings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 13523-21
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2024
EUROPÄISCHE NORM
ICS 25.220.60 Supersedes EN 13523-21:2017
English Version
Coil coated metals - Test methods - Part 21: Evaluation of
outdoor exposed panels
Tôles prélaquées - Méthodes d'essai - Partie 21 : Bandbeschichtete Metalle - Prüfverfahren - Teil 21:
Évaluation des panneaux exposés en extérieur Bewertung von freibewitterten Probenplatten
This European Standard was approved by CEN on 1 January 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13523-21:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Principle . 7
5 Apparatus and materials . 7
6 Sampling . 7
7 Test panels . 7
8 Procedure. 7
8.1 General . 7
8.2 Preparation . 8
8.3 Evaluation . 8
8.3.1 General . 8
8.3.2 Panel 1 (45° panel) . 8
8.3.3 Panel 2 (90° panel) . 9
8.3.4 Panel 3 (5° panel) . 10
9 Expression of results . 11
10 Precision . 11
11 Test report . 11
Bibliography . 17

European foreword
This document (EN 13523-21:2024) 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 October 2024, and conflicting national standards shall
be withdrawn at the latest by October 2024.
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 13523-21:2017.
21:2017:
a) a definition for “undercreep” has been added
b) visual assessment of chalking in accordance with EN ISO 4628-6 has been added to 8.3.2;
c) the canopy and overlap areas of Type 2 (90°N) and Type 3 (5°S) panels respectively have been
defined in 8.3.3 and 8.3.4;
d) 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
— 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, Türkiye and the United
Kingdom.
1 Scope
This document specifies the procedure for evaluating the behaviour of an organic coating on a metallic
substrate during and after outdoor exposure. Panel design, preparation and the procedure for outdoor
exposure are performed in accordance with EN 13523-19.
After washing of the panel, some dirt can remain on the panel. This remaining dirt can influence the
accuracy and precision of readings of gloss and colour, performed on exposed panels, although carried
out in accordance with the standards. Unlike other precise measurements, the objective of this European
Standard is to report on trends in the corrosion and/or paint degradation behaviour of coil coated panels.
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 1396, Aluminium and aluminium alloys — Coil coated sheet and strip for general applications —
Specifications
EN 10169, Continuously organic coated (coil coated) steel flat products — Technical delivery conditions
EN 13523-0, Coil coated metals — Test methods — Part 0: General introduction
EN 13523-2, Coil coated metals — Test methods — Part 2: Gloss
EN 13523-3, Coil coated metals — Test methods — Part 3: Colour difference and metamerism —
Instrumental comparison
EN 13523-14, Coil coated metals — Test methods — Part 14: Chalking (Helmen method)
EN 13523-19, Coil coated metals — Test methods — Part 19: Panel design and method of atmospheric
exposure testing
EN ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of
blistering (ISO 4628-2)
EN ISO 4628-3, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of degree of
rusting (ISO 4628-3)
EN ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of
cracking (ISO 4628-4)
EN ISO 4628-5, Paints and varnishes — Evaluation of quantity and size of defects, and of intensity of uniform
changes in appearance — Part 5: Assessment of degree of flaking (ISO 4628-5)
EN ISO 4628-6, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 6: Assessment of degree of
chalking by tape method (ISO 4628-6)
EN ISO 4628-8, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 8: Assessment of degree of
delamination and corrosion around a scribe or other artificial defect (ISO 4628-8)
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 terminology databases for use in standardization at the following addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
holiday
defect of a paint film
Examples: Pinholes and craters
[SOURCE: EN ISO 4618:2023, 3.138]
3.2
artificial defect
holiday through a coating, deliberately introduced in order to expose the underlying metal substrate
prior to exposure to a corrosive environment
[SOURCE: EN ISO 4628-8:2012, 3.2]
3.2.1
scribe
linear holiday through a coating, deliberately introduced in order to expose the underlying metal
substrate prior to exposure in a corrosive environment
[SOURCE: EN ISO 4618:2023, 3.224]
3.2.2
edge
unprotected cut edge, in order to expose the underlying metal substrate prior to exposure in a corrosive
environment
3.3
corroded area
area around a defect where the substrate has been attacked by corrosion
[SOURCE: EN ISO 4628-8:2012, 3.4]
3.4
delaminated area
area around a defect where loss of adhesion of a coating from a substrate or an underlying coating has
occurred
[SOURCE: EN ISO 4628-8:2012, 3.5]
3.5
undercreep
corrosion progressing underneath the coating parallel to the surface or delamination emanating from an
unprotected cut-edge or an artificial defect
4 Principle
The behaviour of the test panels exposed in accordance with EN 13523-19 is evaluated. Any degradation
in the relevant area, i.e. corroded area and delaminated area, is reported, using the relevant parts of the
EN 13523 series and appropriate EN ISO Standards.
In cases where the inspection area is limited (e.g. at screws and bends), the evaluation method (see the
EN ISO 4628 series) is replaced by an easier and more suitable measurement of the degradation in
millimetres.
Where possible, the results of symmetrical areas, e.g. left and right edges, are combined and the average
value is reporte
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