Bsi bs en 13523 21 2010
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BRITISH STANDARD
BS EN
13523-21:2010
Coil coated metals —
Test methods
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Part 21: Evaluation of outdoor exposed
panels
ICS 25.220.60
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BS EN 13523-21:2010
National foreword
This British Standard is the UK implementation of EN 13523-21:2010. It
supersedes BS EN 13523-21:2003 which is withdrawn.
The UK participation in its preparation was entrusted to Technical
Committee STI/27, Paint systems for metallic substrates.
A list of organizations represented on this committee can be obtained on
request to its secretary.
This publication does not purport to include all the necessary provisions
of a contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity
from legal obligations.
This British Standard
was published under the
authority of the Standards
Policy and Strategy
Committee on 30 June
2010
Amendments/corrigenda issued since publication
Date
Comments
© BSI 2010
ISBN 978 0 580 65394 0
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BS EN 13523-21:2010
EN 13523-21
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2010
ICS 25.220.60
Supersedes EN 13523-21:2003
English Version
Coil coated metals - Test methods - Part 21: Evaluation of
outdoor exposed panels
Tôles prélaquées - Méthodes d'essai - Partie 21 :
Évaluation des panneaux exposés en extérieur
Bandbeschichtete Metalle - Prüfverfahren - Teil 21:
Bewertung von freibewitterten Probenplatten
This European Standard was approved by CEN on 20 February 2010.
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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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN
All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
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Ref. No. EN 13523-21:2010: E
BS EN 13523-21:2010
EN 13523-21:2010 (E)
Contents
Page
Foreword ...................................................................................................................................................................... 3
1
Scope .............................................................................................................................................................. 5
2
Normative references .................................................................................................................................... 5
3
Terms and definitions ................................................................................................................................... 5
4
Principle .......................................................................................................................................................... 5
5
Apparatus and materials ............................................................................................................................... 6
6
Sampling ......................................................................................................................................................... 6
7
Test panels ...................................................................................................................................................... 6
8
8.1
8.2
8.3
Procedure ........................................................................................................................................................ 6
General ............................................................................................................................................................ 6
Preparation ..................................................................................................................................................... 6
Evaluation ....................................................................................................................................................... 7
9
Expression of results .................................................................................................................................... 9
10
Precision ......................................................................................................................................................... 9
11
Test report ....................................................................................................................................................... 9
Bibliography .............................................................................................................................................................. 15
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BS EN 13523-21:2010
EN 13523-21:2010 (E)
Foreword
This document (EN 13523-21:2010) 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 September 2010, and conflicting national standards shall be withdrawn at the
latest by September 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13523-21:2003.
The main changes are:
a) the text has been revised editorially and the normative references have been updated.
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EN 13523, Coil coated metals — Test methods, consists of the following parts:
Part 0: General introduction and list of test methods
Part 1: Film thickness
Part 2: Specular gloss
Part 3: Colour difference — 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 15: Metamerism
Part 16: Resistance to abrasion
Part 17: Adhesion of strippable films
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BS EN 13523-21:2010
EN 13523-21:2010 (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: Colour stability in 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)
According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and the United Kingdom.
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BS EN 13523-21:2010
EN 13523-21:2010 (E)
1
Scope
This European Standard 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
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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.
EN 13523-0:2001, Coil coated metals — Test methods — Part 0: General introduction and list of test methods
EN 13523-2, Coil coated metals — Test methods — Part 2: Specular gloss
EN 13523-3, Coil coated metals — Test methods — Part 3: Colour difference — 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 for 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 4628-2:2003)
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 4628-3:2003)
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 4628-4:2003)
EN ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size
of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking
(ISO 4628-5:2003)
3
Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13523-0:2001 apply.
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 EN 13523 and appropriate EN ISO Standards.
In cases where the inspection area is limited (e.g. at screws and bends), the evaluation method described in the
EN ISO 4628 standard series is replaced by an easier and more suitable measurement of the degradation in
millimetres.
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BS EN 13523-21:2010
EN 13523-21:2010 (E)
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 the available flat area, the number of recommended readings might vary from other parts of
EN 13523 and relevant EN ISO Standards.
5
It is strongly recommended to take a photograph of each exposed panel at each inspection.
Apparatus and materials
5.1
Gloss meter, in accordance with EN 13523-2.
5.2
Apparatus for colour measurement, in accordance with EN 13523-3.
5.3
Apparatus for measurement of chalking, in accordance with EN 13523-14.
5.4
Washing solution, containing 0,5 % (by mass) of a mild non-reactive detergent (pH 6 to 7) in water.
5.5
Cloth or sponge, non-abrasive and smooth.
6
Sampling
See EN 13523-0.
7
Test panels
See EN 13523-0.
8
Procedure
8.1
General
Evaluate the coating properties at ambient temperature.
The panels should be inspected not less than every six months in the first year and yearly afterwards. Colour
measurements on metallics as well as gloss and colour measurements on textured and embossed surfaces are only
indicative.
8.2
Preparation
8.2.1 Ensure that results of the measurements of gloss in accordance with EN 13523-2 and colour in accordance
with EN 13523-3 are available before exposure of the test panels.
When using reference panels, these panels shall be kept in an envelope and not exposed to any light source.
8.2.2
Some measurements require a washed area prior to inspection. Washing shall be performed as follows:
Wash the upper 1/3 part of the 45° panel with washing solution (5.4) at ambient temperature (see Note). Use the cloth
or sponge (5.5) to gently clean the surface. Rinse with water at ambient temperature and air dry at ambient
temperature.
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NOTE 3
BS EN 13523-21:2010
EN 13523-21:2010 (E)
NOTE
8.3
Washing should be carried out in such a way that the other 2/3 of the panel is not affected.
Evaluation
8.3.1
General
The following procedure specifies the sets of different readings that are taken. For each panel the procedure is
accompanied by a table summarising the different measurements and the relevant standard test methods.
8.3.2
Panel 1 (45° panel)
A summary of the different measurements and evaluations on panel 1 is given in Table 1.
For gloss and colour change, measurements shall be performed on the washed area of the panel. Chalking and the
evaluation of the overall surface shall be performed on the unwashed area of the panel. Cracking on the bend shall be
evaluated on both the washed and unwashed area of the panel.
Inspect the panels as indicated in a) to e) below.
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a) Change in gloss
Measure the gloss in accordance with EN 13523-2. Perform the reading parallel with the bend and report the
average value of not less than three measurements. Use the same measurement angle as has been used for
the initial measurement prior to exposure and report this angle. Report both initial gloss and gloss after
exposure from which the change in gloss and the gloss retention can be calculated.
b) Colour change
Carry out the measurement in accordance with EN 13523-3. The colour change is the difference between the
initial L*, a*, b* values and the L*, a*, b* values after exposure. Report initial and inspection measurements L*,
a*, b* and changes ∆L*, ∆a*, ∆b* and ∆E.
c) Chalking
Perform the measurement and report the results in accordance with EN 13523-14.
d) Cracking on the bend
Inspect the bend visually for cracking. Report the presence of cracks as the distance, in millimetres, from the
1T side to the last sign of cracking.
e) Overall surface evaluation
The overall surface is defined as the flat surface of panel 1 excluding edges and bends.
Inspect the overall surface of the panel for blisters in accordance with EN ISO 4628-2, for cracking in accordance
with EN ISO 4628-4, for flaking in accordance with EN ISO 4628-5 and for corrosion in accordance with
EN ISO 4628-3.
Report all other observations, e.g. dirt, mildew, etc., as remarks.
8.3.3
Panel 2 (90° panel)
A summary of the different measurements and evaluations on panel 2 is given in Table 2.
NOTE
The inspection is limited to the evaluation of corrosion. Evaluation of the degree of paint degradation can be
performed but this panel orientation is not recommended for it. The 45° panel (panel 1) is more appropriate.
The inspection shall be performed on unwashed panels. Any deviations from the specified inspection shall be reported.
Inspect the panels as indicated in a) to g) below.
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BS EN 13523-21:2010
EN 13523-21:2010 (E)
a)
Edges
Describe the type of degradation, e.g. filiform corrosion, delamination, blistering, rusting (white or red rust).
Measure the size of the degradation, e.g. average and maximum length in millimetres, percentage of edge
affected, or number of individual degradations.
Average results on left and right edges and report as side edge results. Report both top and bottom edges
separately as well as results on the overlap area.
b)
Overall surface evaluation
Inspect the overall surface of the panel for blisters in accordance with EN ISO 4628-2, for cracking in
accordance with EN ISO 4628-4, for flaking in accordance with EN ISO 4628-5 and for corrosion in
accordance with EN ISO 4628-3.
c)
Bends
Inspect the bends visually for cracks. Report the presence of cracks as the distance in millimetres from the 1T
side to the last sign of cracking. Average the results of the two bends. Also inspect for blisters in accordance
with EN ISO 4628-2, for corrosion in accordance with EN ISO 4628-3 and for flaking in accordance with
EN ISO 4628-5.
Report any defects occurring only on the flat sides of the bends under other observations.
d)
Areas around the screws
Report the type of degradation, together with its size as the length, in millimetres, in a radial direction.
e)
Areas around rivets
See d) above.
f)
Scribe
For the horizontal and vertical scribes, report the average and maximum values of delamination in millimetres
perpendicular from the scribes, as the average of the two scribes. If required, report the affected area of the
scribes as a percentage. Also report the presence of blisters, filiform corrosion and/or rust.
g)
Reverse side
If required, report relevant degradation.
Report all other observations as remarks.
8.3.4
Panel 3 (5° panel)
A summary of the different measurements and evaluations on panel 3 is given in Table 3.
NOTE
For this panel, the recommended inspection is limited to the evaluation of corrosion. However, evaluation of the
degree of paint degradation may also be carried out.
The inspection shall be performed on unwashed panels. Any deviations from the specified inspection shall be reported.
Inspect the panels as indicated in a) to g) below.
a)
Edges
Describe the type of degradation, e.g. filiform corrosion, delamination, blistering, rusting (white or red rust).
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The overall surface is defined as the flat surface of panel 2 excluding edges, bend, scribes and areas around
screws or rivets.
BS EN 13523-21:2010
EN 13523-21:2010 (E)
Measure the size of the degradation, e.g. average and maximum length in millimetres, percentage of edge
affected, or number of individual degradations.
Average results on left and right edges and report as side edge results. Report both top and bottom edges
separately as well as results on the overlap area.
b)
Overall surface evaluation
The overall surface is defined as the flat surface of panel 3 excluding edges, bend, scribes and area around
screws or rivets.
Inspect the overall surface of the panel for blisters.
c)
Bend
Inspect the bend of the upper panel visually for cracks. Report the presence of cracks as the distance in
millimetres from the 1T side to the last sign of cracking. Also inspect for blisters in accordance with
EN ISO 4628-2, for corrosion in accordance with EN ISO 4628-3 and for flaking in accordance with
EN ISO 4628-5.
Report any defects occurring only on the flat sides of the bends under other observations.
d)
Lower exposed surface in the immediate vicinity of the overlap
See b) above.
e)
Areas around screws
Report the type of degradation around screws, together with its size as the length in millimetres in a radial
direction.
f)
Area around rivets
See e) above.
g)
Reverse side
If required, report relevant degradation.
Report all other observations as remarks.
9
Expression of results
Express the results as indicated in 8.3. Possible formats are given in Tables 1, 2 and 3 respectively.
10 Precision
The concept of precision is not applicable to this part of EN 13523.
11 Test report
The test report for panels exposed shall contain all data given in Tables 1, 2 and 3 respectively. Also indicate any
deviation from the test method specified.
If initial measurements are made on coated reference panels and not on the test panels before exposure this shall
be reported.
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EN 13523-21:2010 (E)
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Table 1 — Typical table of results – Panel 1 (45° panel) – Summary of measurements and evaluations in accordance with EN 13523-21
Property/area inspected
Gloss
EN 13523-2
Angle
Initial gloss
Units
Gloss after exposure
Units
Other observations
Change in gloss
Units
Gloss retention
%
e.g. dirt, mildew, etc.
20°
60°
85°
Colour
EN 13523-3
Chalking
EN 13523-14
Cracking on bend
Not for Resale
Overall surface
10
Measured values/Results of inspection
L*
Initial colour
a*
b*
Colour after exposure
L*
a*
b*
∆L*
Colour change
∆a*
∆b*
Colour difference
∆E
Length in millimetres (mm) from 1T
Cracking
EN ISO 4628-4
Size
Quantity
(density)
Flaking
EN ISO 4628-5
Size
Quantity
(density)
Date of inspection
Blistering
EN ISO 4628-2
Size
Quantity
(density)
Panel identification No.
Start of exposure
Description:
Periods removed from exposure
Dates of previous inspections
Substrate
Coating type
Others (e.g. surface
treatment)
Colour
Accumulative time of
exposure
Rusting
EN ISO 4628-3
Size
Quantity
(density)
Exposure site
Signature(s)
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EN 13523-21:2010 (E)
Table 2 — Typical table of results – Panel 2 (90° panel) – Summary of measurements and evaluations in accordance with EN 13523-21
Property/area
inspected
Edges
Measured values/Results of inspection
Filiform corrosion
Size
average
maximum
Percentage
Delamination
mm
Percentage
affected
Blistering
Size
Number
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Bends
Cracking
EN ISO 4628-4
Size
Quantity
Cracking
length in millimetres (mm)
from 1T
Flaking
EN ISO 4628-5
Size
Quantity
Flaking
EN ISO 4628-5
Size
Areas around
screws
Areas around
rivets
Scribe
Type of degradation:
Size (mm):
Type of degradation:
Size (mm):
Delamination (mm)
Area affected (%):
Quantity
Rusting
Percentage
affected
affected
side
top
bottom
overlap
Overall surface
Other observations
Blistering
EN ISO 4628-2
Size
Quantity
Blistering
EN ISO 4628-2
Size
Blisters
Quantity
Rust:
Colour
of the
rusting
(white
or red
rust)
Percentage
affected
e.g. dirt, mildew, etc.
Number of
spots
Rusting
EN ISO 4628-3
Size
Quantity
Rusting
EN ISO 4628-3
Size
Quantity
Filiform corrosion:
11
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EN 13523-21:2010 (E)
Table 2 (continued)
Property/area
inspected
Measured values/Results of inspection
Reverse side
Panel
identification No.
Degradation:
Start of exposure
Description:
Periods removed from exposure
Dates of previous inspections
Substrate
Coating type
Others (e.g. surface
treatment)
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Date of inspection
Colour
Accumulative time of
exposure
Other observations
Exposure site
Signature(s)
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EN 13523-21:2010 (E)
Table 3 — Typical table of results – Panel 3 (5° panel) – Summary of measurements and evaluations in accordance with EN 13523-21
Property/area
inspected
Edges
Measured values/Results of inspection
Filiform corrosion
Size
average
maximum
Percentage
Delamination
mm
Percentage
affected
Blistering
Size
Number
affected
side
top
bottom
overlap
Overall surface
Cracking
length in millimetres (mm)
from 1T
Flaking
EN ISO 4628-5
Size
Lower exposed
surface
Areas around
screws
Rusting
Percentage
affected
Colour
of the
rusting
(white or
red rust)
Percentage
affected
e.g. dirt, mildew, etc.
Number of
spots
Blistering
EN ISO 4628-2
Size
Quantity
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Bend
Other observations
Quantity
Blistering
EN ISO 4628-2
Size
Quantity
Rusting
EN ISO 4628-3
Size
Quantity
Blistering
EN ISO 4628-2
Size
Quantity
Type of degradation:
Size (mm):
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EN 13523-21:2010 (E)
Table 3 (continued)
Property/area
inspected
Measured values/Results of inspection
Area around rivets
Reverse side
Panel
identification No.
Type of degradation:
Degradation:
Start of exposure
Description:
Periods removed from exposure
Dates of previous inspections
Substrate
Coating type
Others (e.g. surface
treatment)
Size (mm):
Date of inspection
Colour
Accumulated time of
exposure
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14
Other observations
Exposure site
Signature(s)
BS EN 13523-21:2010
EN 13523-21:2010 (E)
[1]
EN 1396, Aluminium and aluminium alloys — Coil coated sheet and strip for general applications —
Specifications
[2]
EN ISO 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and
designation system (ISO 4628-1:2003)
[3]
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 4628-6:2007)
[4]
EN ISO 4628-7, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 7: Assessment of degree of
chalking by velvet method (ISO 4628-7:2003)
[5]
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 (ISO 4628-8:2005)
[6]
EN ISO 4628-10, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 10: Assessment of degree of
filiform corrosion (ISO 4628-10:2003)
[7]
EN 10169-1, Continuously organic coated (coil coated) steel flat products — Part 1: General information
(definitions, materials, tolerances, test methods)
[8]
EN 10169-2, Continuously organic coated (coil coated) steel flat products — Part 2: Products for building
exterior applications
[9]
EN 10169-3, Continuously organic coated (coil coated) steel flat products — Part 3: Products for building
interior applications
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Bibliography
BS EN
13523-21:2010
BSI - British Standards Institution
BSI is the independent national body responsible for preparing British
Standards. It presents the UK view on standards in Europe and at the
international level. It is incorporated by Royal Charter.
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