EN ISO 2409:2020

Paints and varnishes - Cross-cut test (ISO 2409:2020)

This document specifies a test method for assessing the resistance of paint coatings and varnishes (including wood stains) to separation from substrates when a right-angle lattice pattern is cut into the coating, penetrating through to the substrate. The property determined by this empirical test procedure depends, among other factors, on the adhesion of the coating to either the preceding coat or the substrate. This procedure is not, however, a means of measuring adhesion.
NOTE 1  Where a measurement of adhesion is required, see the method described in ISO 4624.
NOTE 2  Although the test is primarily intended for use in the laboratory, the test is also suitable for field testing.
The method described can be used either as a pass/fail test or, where circumstances are appropriate, as a six-step classification test. When applied to a multi-coat system, assessment of the resistance to separation of individual layers of the coating from each other can be made.
The test can be carried out on finished objects and/or on specially prepared test specimens.
Although the method is applicable to paint on hard (e.g. metal) and soft (e.g. wood and plaster) substrates, these different substrates need a different test procedure (see Clause 8).
The method is not suitable for coatings of total thickness greater than 250 µm or for textured coatings.
NOTE 3  The method, when applied to coatings designed to give a rough patterned surface, will give results which will show too much variation (see also ISO 16276-2).

Beschichtungsstoffe - Gitterschnittprüfung (ISO 2409:2020)

Dieses Dokument legt ein Prüfverfahren zum Bewerten des Widerstandes von Beschichtungen (einschließlich Holzbeizen) gegen Trennung vom Substrat fest, wenn ein bis zum Substrat durchgehendes rechtwinkliges Gitter in die Beschichtung geschnitten wird. Die nach diesem empirischen Verfahren bestimmte Eigenschaft hängt, neben anderen Faktoren, von der Haftfestigkeit der Beschichtung auf der vorher aufgetragenen Schicht oder auf dem Substrat ab. Dieses Verfahren ist jedoch kein Verfahren zur Messung der Haftfestigkeit.
ANMERKUNG 1 Zur Messung der Haftfestigkeit siehe das in ISO 4624 festgelegte Verfahren.
ANMERKUNG 2 Obwohl die Gitterschnittprüfung in erster Linie zur Anwendung im Laboratorium gedacht ist, ist sie auch als Feldprüfung geeignet.
Das festgelegte Verfahren kann entweder als Ja/Nein-Prüfung oder, wenn entsprechende Umstände gegeben sind, als Einstufungsprüfung mit sechs Stufen angewendet werden. Bei Mehrschichtsystemen kann auch die Zwischenschicht-Haftfestigkeit abgeschätzt werden.
Die Prüfung kann an fertigen Gegenständen und/oder an eigens dafür hergestellten Probenplatten durchge¬führt werden.
Obwohl das Verfahren auf Beschichtungen auf harten (z. B. Metall) und weichen (z. B. Holz und Putz) Substraten anwendbar ist, erfordern diese unterschiedlichen Substrate eine unterschiedliche Durchführung (siehe Abschnitt 8).
Das Verfahren ist nicht für Beschichtungen mit einer Gesamtschichtdicke über 250 µm oder für Struktur¬beschichtungen geeignet.
ANMERKUNG 3 Wenn das Verfahren auf Beschichtungen mit einer strukturierten Oberfläche angewendet wird, streuen die Ergebnisse zu stark (siehe auch ISO 16276 2).

Peintures et vernis - Essai de quadrillage (ISO 2409:2020)

Le présent document spécifie une méthode d'essai pour l'évaluation de la résistance des revêtements de peinture et des vernis (y compris les colorants pour bois) à être séparés de leurs subjectiles lorsqu'on pratique dans le revêtement un quadrillage par incisions jusqu'au subjectile. La propriété déterminée par cette méthode empirique dépend, entre autres, de l'adhérence de la couche soit à la couche précédente, soit au subjectile. Cependant, cette méthode n'est pas un moyen de mesurer l'adhérence.
NOTE 1    Lorsqu'une mesure de l'adhérence est nécessaire, voir la méthode décrite dans l'ISO 4624.
NOTE 2    Bien que cet essai soit avant tout un essai de laboratoire, il peut également être réalisé in situ.
La méthode décrite peut être utilisée soit comme essai «tout ou rien» soit, le cas échéant, comme essai en vue d'une classification en six classes. Lorsqu'il est appliqué à un système multicouche, le mode opératoire permet également d'évaluer la résistance des couches individuelles du revêtement à se séparer les unes des autres.
L'essai peut être réalisé sur des objets finis et/ou sur des éprouvettes spécialement préparées.
Bien que la méthode soit applicable à des peintures sur subjectiles durs (par exemple en métal) ou tendres (par exemple bois et plâtre), on utilise un mode opératoire différent selon les subjectiles (voir Article 8).
La méthode ne convient ni aux revêtements dont l'épaisseur totale est supérieure à 250 µm, ni aux revêtements texturés.
NOTE 3    La méthode donne des résultats trop dispersés lorsqu'elle est appliquée à des revêtements conçus pour donner une surface rugueuse (voir également l'ISO 16276‑2).

Barve in laki - Preskus oprijema z zarezovanjem rešetke (ISO 2409:2020)

General Information

• Status: Published
• Publication Date: 22-Sep-2020
• Withdrawal Date: 30-Mar-2021
• ICS: 87.040 - Paints and varnishes
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 23-Sep-2020
• Completion Date: 23-Sep-2020
• Ref Project: SIST EN ISO 2409:2020 - Paints and varnishes - Cross-cut test (ISO 2409:2020)

Relations

• Replaces: EN ISO 2409:2013 - Paints and varnishes - Cross-cut test (ISO 2409:2013)
• Effective Date: 13-Jun-2018

Overview

EN ISO 2409:2020 - Paints and varnishes: Cross-cut test (ISO 2409:2020) specifies an empirical test method for assessing the resistance of paint coatings and varnishes (including wood stains) to separation when a right‑angle lattice pattern is cut through the coating to the substrate. The method is intended for both laboratory and field testing and can be used as a simple pass/fail check or as a six-step classification. Note: this procedure evaluates resistance to separation and is not a direct measurement of adhesion (see ISO 4624 for adhesion tests).

Key topics and requirements

• Test principle: Six parallel cuts are made, followed by six perpendicular cuts to form a lattice; any loose particles are removed and the cut area is visually compared to the classification scale.
• Cutting tools: Both single‑blade and multi‑blade cutters are permitted. Tools must produce the specified V‑shaped cut through the total coating thickness and have sharp, undamaged edges. Tool type (manual vs motor‑driven) affects results; results obtained with different tools are not directly comparable.
• Substrates and specimen: Applicable to hard (e.g., metal) and soft (e.g., wood, plaster) substrates, but different substrate types require different procedures (Clause 8). Test can be run on finished objects or prepared specimens.
• Limitations: Not suitable for coatings thicker than 250 µm, textured coatings, or intentionally rough/patterned surfaces (results will vary).
• Evaluation: Visual assessment under specified lighting conditions and comparison to the six‑step classification; removal of loose paint prior to assessment is required.
• Reproducibility: The standard addresses repeatability and reproducibility considerations and recommends consistent apparatus and cutting technique within a test series.

Applications and users

EN ISO 2409:2020 is widely used for routine quality control, specification compliance, and comparative testing. Typical users include:

• Coatings and varnish manufacturers (product QA/QC)
• Independent testing laboratories and certification bodies
• Specifiers, procurement teams and contractors (surface preparation and coating acceptance)
• Manufacturers of coated products (metalwork, wood furniture, automotive components, architectural elements)
• Field inspectors and maintenance teams (on‑site checks of coating systems)

The test is especially valuable for rapid screening of coating systems, layer separation in multi‑coat systems, and confirming coating integrity after handling or environmental exposure.

Related standards

• ISO 4624 - Measurement of adhesion (pull‑off test)
• ISO 1513 - Examination and preparation of test samples
• ISO 2808 - Determination of film thickness
• ISO 4618 - Terms and definitions for paints and varnishes
• ISO 13076 - Lighting and visual assessment procedures
• ISO 15528 - Sampling for paints and varnishes
• ISO 16276‑2 - Notes on rough patterned surfaces

Keywords: EN ISO 2409:2020, cross-cut test, paints and varnishes, lattice pattern, coating separation, coating classification, adhesion screening, quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2020
Nadomešča:
SIST EN ISO 2409:2013
Barve in laki - Preskus oprijema z zarezovanjem rešetke (ISO 2409:2020)
Paints and varnishes - Cross-cut test (ISO 2409:2020)
Beschichtungsstoffe - Gitterschnittprüfung (ISO 2409:2020)
Peintures et vernis - Essai de quadrillage (ISO 2409:2020)
Ta slovenski standard je istoveten z: EN ISO 2409:2020
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2409
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 87.040 Supersedes EN ISO 2409:2013
English Version
Paints and varnishes - Cross-cut test (ISO 2409:2020)
Peintures et vernis - Essai de quadrillage (ISO Beschichtungsstoffe - Gitterschnittprüfung (ISO
2409:2020) 2409:2020)
This European Standard was approved by CEN on 16 August 2020.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2409:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2409:2020) has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes" in collaboration with 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 March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
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 ISO 2409:2013.
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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 2409:2020 has been approved by CEN as EN ISO 2409:2020 without any modification.

INTERNATIONAL ISO
STANDARD 2409
Fifth edition
2020-08
Paints and varnishes — Cross-cut test
Peintures et vernis — Essai de quadrillage
Reference number
ISO 2409:2020(E)
©
ISO 2020
ISO 2409:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 2409:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 General . 2
5.2 Cutting tool . 2
5.2.1 General requirements . 2
5.2.2 Single-blade cutting tools . 2
5.2.3 Multi-blade cutting tools . 2
5.3 Guiding and spacing edges . 5
5.4 Viewing lens . 5
6 Sampling . 6
7 Test specimen . 7
7.1 Substrate . 7
7.2 Thickness of coating . 7
8 Procedure. 7
8.1 General . 7
8.1.1 Test conditions. 7
8.1.2 Conditioning of the test panels . 7
8.1.3 Number of cuts . 7
8.1.4 Spacing of cuts . 7
8.1.5 Number of determinations. 8
8.2 Cutting the coating using the manual procedure . 8
8.3 Cutting the coating using a motor-driven tool . 8
9 E valuation and expression of results . 8
10 Designation of the test result . 9
11 Precision .10
11.1 Repeatability limit, r .10
11.2 Reproducibility limit, R .10
12 Test report .10
Annex A (informative) Examples of suitable procedures for removing loose paint .12
Bibliography .14
ISO 2409:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 9, General test methods for paints and varnishes, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 2409:2013), which has been technically
revised. The main changes compared to the previous edition are as follows:
— Clause 3 has been added;
— Clause 4 has been added;
— the general requirements for the use of single-cutting tools and multi-cutting tools in 5.2.1 have
been updated;
— references to commercially available cutters have been deleted from 5.2.2.3;
— coating of the test panels has been deleted from Clause 7, because final test specimen are assumed;
— the text has been editorially revised and the normative references have been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 2409:2020(E)
Paints and varnishes — Cross-cut test
1 Scope
This document specifies a test method for assessing the resistance of paint coatings and varnishes
(including wood stains) to separation from substrates when a right-angle lattice pattern is cut into
the coating, penetrating through to the substrate. The property determined by this empirical test
procedure depends, among other factors, on the adhesion of the coating to either the preceding coat or
the substrate. This procedure is not, however, a means of measuring adhesion.
NOTE 1 Where a measurement of adhesion is required, see the method described in ISO 4624.
NOTE 2 Although the test is primarily intended for use in the laboratory, the test is also suitable for field
testing.
The method described can be used either as a pass/fail test or, where circumstances are appropriate,
as a six-step classification test. When applied to a multi-coat system, assessment of the resistance to
separation of individual layers of the coating from each other can be made.
The test can be carried out on finished objects and/or on specially prepared test specimens.
Although the method is applicable to paint on hard (e.g. metal) and soft (e.g. wood and plaster)
substrates, these different substrates need a different test procedure (see Clause 8).
The method is not suitable for coatings of total thickness greater than 250 µm or for textured coatings.
NOTE 3 The method, when applied to coatings designed to give a rough patterned surface, will give results
which will show too much variation (see also ISO 16276-2).
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.
ISO 1513, Paints and varnishes — Examination and preparation of test samples
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 4618, Paints and varnishes — Terms and definitions
ISO 13076, Paints and varnishes — Lighting and procedure for visual assessments of coatings
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
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