EN 13523-14:2023

Coil coated metals - Test methods - Part 14: Chalking (Helmen method)

This document describes the procedure for determining objectively the chalking resulting from natural or artificial weathering of an organic coating on a metallic substrate.
The advantage of this procedure for measuring chalking of an organic coating is that the result can be read off immediately on an instrument. Subjective judgement by visual comparison of test specimens with reference specimens is not necessary.
Reproducible results can only be obtained by careful execution of the test. Special attention is paid to the adhesive tape and its application to the test surface.
The test method is not applicable to embossed coatings. In the case of textured coatings, the degree of texture will influence readings. Also, dirt collection can influence readings on outdoor weathered specimens.
NOTE   Different methods for assessing chalking are in use. The results of these different methods are not comparable.

Bandbeschichtete Metalle - Prüfverfahren - Teil 14: Kreiden (Verfahren nach Helmen)

Dieses Dokument legt das Verfahren zum objektiven Bestimmen der Kreidung einer organischen Beschichtung auf einem metallischen Substrat als Folge von Freibewitterung oder künstlicher Bewitterung fest.
Der Vorteil dieses Verfahrens zum Messen der Kreidung einer organischen Beschichtung ist, dass das Ergebnis unmittelbar an einem Messgerät abgelesen werden kann. Eine subjektive Beurteilung durch visuellen Vergleich von Proben mit Bezugsproben ist nicht erforderlich.
Reproduzierbare Ergebnisse können nur erzielt werden, wenn die Prüfung sorgfältig durchgeführt wird. Besonders wird auf das Klebeband und das Aufbringen des Klebebandes auf die zu prüfende Oberfläche geachtet.
Das Prüfverfahren ist nicht anwendbar auf geprägte Beschichtungen. Bei Strukturbeschichtungen beeinflusst der Grad der Strukturierung die Ergebnisse. Auch Schmutzansammlung kann bei freibewitterten Proben die Ergebnisse beeinflussen.
ANMERKUNG   Es gibt unterschiedliche Verfahren zum Beurteilen der Kreidung. Die Ergebnisse dieser unterschiedlichen Verfahren sind nicht vergleichbar.

Tôles prélaquées - Méthodes d'essai - Partie 14 : Farinage (méthode Helmen)

Le présent document décrit le mode opératoire permettant de déterminer objectivement le farinage dû au vieillissement naturel ou artificiel d’un revêtement organique appliqué sur un subjectile métallique.
Ce mode opératoire de mesurage du farinage d’un revêtement organique présente l’avantage de permettre une lecture immédiate du résultat sur un instrument. Il n’est pas nécessaire d’effectuer une évaluation subjective des éprouvettes par comparaison visuelle avec des éprouvettes de référence.
Des résultats reproductibles ne peuvent être obtenus que par une exécution minutieuse de l’essai. Une attention particulière est accordée à la qualité du ruban adhésif et à son application sur la surface d’essai.
La méthode d’essai ne s’applique pas aux revêtements en relief. Dans le cas de revêtements texturés, le degré de texture a une incidence sur les relevés. De même, l’accumulation de poussière peut influer sur les relevés effectués sur les éprouvettes vieillies en extérieur.
NOTE   Il existe différentes méthodes d’évaluation du farinage. Les résultats de ces différentes méthodes ne sont pas comparables.

Prevlečene kovine, ki se navijajo - Preskusne metode - 14. del: Kredanje (metoda po Helmenu)

Del standarda EN 13523 opisuje postopek za objektivno določitev kredanja, ki je posledica naravnega ali umetnega staranja organske prevleke na kovinski podlagi. Prednost tega postopka za merjenje kredanja organske prevleke je odčitavanje rezultatov neposredno na instrumentu. Subjektivna ocena z vizualno primerjavo preskusnih vzorcev z referenčnimi ni potrebna. Dosedanje izkušnje s to preskusno metodo temeljijo predvsem na umetno staranih vzorcih. Ponovljive rezultate je mogoče doseči le s skrbno izvedbo preskusa.

General Information

• Status: Published
• Publication Date: 14-Mar-2023
• ICS: 25.220.60 - Organic coatings
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139/WG 9 - Testing of coil coated metals
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Mar-2023
• Due Date: 13-Mar-2024
• Completion Date: 15-Mar-2023
• Ref Project: SIST EN 13523-14:2023 - Coil coated metals - Test methods - Part 14: Chalking (Helmen method)

Relations

• Replaces: EN 13523-14:2014 - Coil coated metals - Test methods - Part 14: Chalking (Helmen method)
• Effective Date: 18-Jan-2023

Overview

EN 13523-14:2023 - "Coil coated metals - Test methods - Part 14: Chalking (Helmen method)" is a CEN standard that specifies an objective, instrument-based procedure to determine chalking of organic coatings on metallic substrates after natural or artificial weathering. The Helmen method uses a transparent pressure‑sensitive adhesive tape to lift chalking residues and measures tape transmission (or direct chalking reading) with a glossmeter or portable chalking instrument. The method provides immediate, reproducible results without subjective visual comparison.

Key topics and requirements

• Scope & purpose: Objective measurement of chalking caused by weathering of organic coatings on metal panels; eliminates subjective visual scoring.
• Principle: Apply transparent adhesive tape to the coated surface, rub to ensure contact, remove the tape and measure its transparency. Transmission (%) → chalking (%) by (100 − transmission).
• Apparatus:
  • Preferred: 60° glossmeter or multi‑angle glossmeter with 60° adjustment (EN ISO 2813 compliant); a silicon photocell is recommended.
  • Alternative: portable chalking apparatus (Helmen tester), though older portable devices are less available.
  • Transparent adhesive tape: 25 mm wide, adhesion strength (10 ± 1) N per 25 mm (per EN 60454-2).
  • Plastic spatula (~25 mm) for rubbing.
• Tape checks & calibration:
  • Tape transmission must be ≥ 90 % on an appropriate support; otherwise the roll is rejected.
  • Calibrate instrument to 100 % transmission using fresh tape on the instrument support.
• Test conditions:
  • Ambient temperature is acceptable; for higher accuracy use (23 ± 2) °C and (50 ± 5) % RH (EN 23270).
  • Outdoor-weathered specimens should be gently cleaned (without removing degradation products) because dirt affects readings.
• Limitations & reporting:
  • Not applicable to embossed coatings; texture and dirt influence results.
  • Values below 10 % chalking are reported as “no chalking.”
  • Different chalking test methods are not directly comparable.
  • Test report must identify product, test history (natural/artificial weathering), cleaning procedure, instrument details, results, deviations and date.

Applications and users

• Quality control and R&D for coil‑coated metal manufacturers (aluminium, steel).
• Coating formulators and laboratories assessing weathering resistance.
• Specifiers, architects and manufacturers verifying product performance after exposure.
• Regulatory or procurement testing where objective chalking data are required.

Related standards

• EN 13523 series (general coil‑coated metal test methods), including EN 13523‑0, EN 13523‑10, EN 13523‑19
• EN ISO 2813 (gloss measurement)
• EN ISO 4628‑6 (chalking assessment by tape method)
• EN 60454‑2 (adhesive tape test methods)
• EN 23270 (conditioning temperatures/humidities)
• Industry references: EN 1396, EN 10169, ASTM D4214

Keywords: EN 13523-14:2023, chalking test, Helmen method, coil coated metals, glossmeter, adhesive tape, weathering test, organic coating.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2023
Nadomešča:
SIST EN 13523-14:2014
Prevlečene kovine, ki se navijajo - Preskusne metode - 14. del: Kredanje (metoda
po Helmenu)
Coil coated metals - Test methods - Part 14: Chalking (Helmen method)
Bandbeschichtete Metalle - Prüfverfahren - Teil 14: Kreiden (Verfahren nach Helmen)
Tôles prélaquées - Méthodes d'essai - Partie 14: Farinage (méthode Helmen)
Ta slovenski standard je istoveten z: EN 13523-14:2023
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 13523-14
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 25.220.60 Supersedes EN 13523-14:2014
English Version
Coil coated metals - Test methods - Part 14: Chalking
(Helmen method)
Tôles prélaquées - Méthodes d'essai - Partie 14 : Bandbeschichtete Metalle - Prüfverfahren - Teil 14:
Farinage (méthode Helmen) Kreiden (Verfahren nach Helmen)
This European Standard was approved by CEN on 6 February 2023.

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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13523-14:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Apparatus . 6
6 Sampling . 6
7 Test specimens . 6
8 Procedure. 6
8.1 General . 6
8.2 Checking the adhesive tape . 6
8.3 Calibration . 6
8.4 Measurement . 6
9 Expression of results . 7
10 Precision . 7
11 Test report . 7
Bibliography . 8

European foreword
This document (EN 13523-14:2023) 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 2023, and conflicting national standards shall
be withdrawn at the latest by September 2023.
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 13523-14:2014.
The main changes compared to the previous edition are listed below:
a) the description of the test apparatus has been changed so that the glossmeter is preferred to the
portable chalking apparatus, which is no longer manufactured;
b) 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)
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