EN 13523-21:2024

SLOVENSKI STANDARD
oSIST prEN 13523-21:2023
01-september-2023
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: prEN 13523-21
ICS:
25.220.60 Organske prevleke Organic coatings
oSIST prEN 13523-21:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 13523-21:2023
oSIST prEN 13523-21:2023
DRAFT
EUROPEAN STANDARD
prEN 13523-21
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2023
ICS 25.220.60 Will supersede 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 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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13523-21:2023 E
worldwide for CEN national Members.

oSIST prEN 13523-21:2023
prEN 13523-21:2023 (E)
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. 8
8.1 General . 8
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
oSIST prEN 13523-21:2023
prEN 13523-21:2023 (E)
European foreword
This document (prEN 13523-21:2023) 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 13523-21:2017.
In comparison with the previous edition, the following technical modifications have been made:
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
oSIST prEN 13523-21:2023
prEN 13523-21:2023 (E)
— 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)
oSIST prEN 13523-21:2023
prEN 13523-21:2023 (E)
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)
oSIST prEN 13523-21:2023
prEN 13523-21:2023 (E)
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
circular defect
circular holiday through a coating, deliberately introduced in order to expose the underlying metal
substrate prior to exposure in a corrosive environment
[SOURCE: EN ISO 4628-8:2012, 3.3]
3.2.2
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]
3.2.3
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]
oSIST prEN 13523-21:2023
prEN 13523-21:2023 (E)
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 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 reported.
The inspection of the 45° panel (panel 1) will focus on paint degradation, whereas the 90° panel (panel
2) and the 5° panel (panel 3) are mainly evaluated for corrosion.
NOTE 1 Panel designations (1, 2, 3) are as defined in EN 13523-19.
NOTE 2 Due to restrictions in
...