Paints and varnishes - Scratch test using a spring-loaded pen (ISO 22557:2019)

This document specifies a method for determining the resistance of a coating to scratches introduced by a usually hand-held loaded stylus.
The test can be carried out using a point stylus (method A) or using a disc stylus (method B).
Both methods are generally applicable and can be used in the field as well as on curved surfaces. Method A can also be applied on small test specimens (minimum dimensions 30 mm × 50 mm).
The test can be carried out as a "pass/fail" test (test requirement I) or as a classification test (test requirement II).

Beschichtungsstoffe - Kratzprüfung mit einem Härteprüfstab (ISO 22557:2019)

Peintures et vernis - Essai de rayage manuel utilisant un barreau d'essai de dureté (ISO 22557:2019)

Barve in laki - Preskus razenja z uporabo vzmetnega svinčnika (ISO 22557:2019)

General Information

Status
Published
Public Enquiry End Date
01-Oct-2020
Publication Date
27-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Jan-2021
Due Date
18-Mar-2021
Completion Date
28-Jan-2021

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SLOVENSKI STANDARD
SIST EN ISO 22557:2021
01-marec-2021
Barve in laki - Preskus razenja z uporabo vzmetnega svinčnika (ISO 22557:2019)
Paints and varnishes - Scratch test using a spring-loaded pen (ISO 22557:2019)
Beschichtungsstoffe - Kratzprüfung mit einem Härteprüfstab (ISO 22557:2019)

Peintures et vernis - Essai de rayage manuel utilisant un barreau d'essai de dureté (ISO

22557:2019)
Ta slovenski standard je istoveten z: EN ISO 22557:2020
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 22557:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 22557:2021
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SIST EN ISO 22557:2021
EN ISO 22557
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 87.040
English Version
Paints and varnishes - Scratch test using a spring-loaded
pen (ISO 22557:2019)

Peintures et vernis - Essai de rayage manuel utilisant Beschichtungsstoffe - Kratzprüfung mit einem

un barreau d'essai de dureté (ISO 22557:2019) Härteprüfstab (ISO 22557:2019)
This European Standard was approved by CEN on 30 November 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 22557:2020 E

worldwide for CEN national Members.
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SIST EN ISO 22557:2021
EN ISO 22557:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 22557:2021
EN ISO 22557:2020 (E)
European foreword

The text of ISO 22557:2019 has been prepared by Technical Committee ISO/TC 35 "Paints and

varnishes” of the International Organization for Standardization (ISO) and has been taken over as

EN ISO 22557:2020 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 June 2021, and conflicting national standards shall be

withdrawn at the latest by June 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.

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 22557:2019 has been approved by CEN as EN ISO 22557:2020 without any modification.

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SIST EN ISO 22557:2021
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SIST EN ISO 22557:2021
INTERNATIONAL ISO
STANDARD 22557
First edition
2019-07
Paints and varnishes — Scratch test
using a spring-loaded pen
Peintures et vernis — Essai de rayage manuel utilisant un barreau
d'essai de dureté
Reference number
ISO 22557:2019(E)
ISO 2019
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SIST EN ISO 22557:2021
ISO 22557:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 22557:2021
ISO 22557:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus ..................................................................................................................................................................................................................... 2

6 Test specimens........................................................................................................................................................................................................ 6

6.1 General requirements ....................................................................................................................................................................... 6

6.2 Film thickness .......................................................................................................................................................................................... 6

6.3 Conditioning .............................................................................................................................................................................................. 6

7 Procedure..................................................................................................................................................................................................................... 7

7.1 Agreements ................................................................................................................................................................................................ 7

7.2 Test conditions ........................................................................................................................................................................................ 7

7.3 General test procedure ..................................................................................................................................................................... 7

7.4 Constant test load method (test requirement I – “pass/fail” test) ............................................................. 7

7.5 Varied test load method (test requirement II – classification test) ........................................................... 7

7.6 Assessment of the damage ............................................................................................................................................................ 8

8 Precision ....................................................................................................................................................................................................................... 9

8.1 General ........................................................................................................................................................................................................... 9

8.2 Repeatability limit, r ......................................................................................................................................................................... 9

8.3 Reproducibility limit, R ................................................................................................................................................................... 9

9 Test report ................................................................................................................................................................................................................... 9

9.1 Detailed form ............................................................................................................................................................................................ 9

9.2 Short form ................................................................................................................................................................................................10

Annex A (informative) Details on the interlaboratory comparison for the estimation precision.....11

Bibliography .............................................................................................................................................................................................................................15

© ISO 2019 – All rights reserved iii
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SIST EN ISO 22557:2021
ISO 22557:2019(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.

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 2019 – All rights reserved
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SIST EN ISO 22557:2021
INTERNATIONAL STANDARD ISO 22557:2019(E)
Paints and varnishes — Scratch test using a spring-
loaded pen
1 Scope

This document specifies a method for determining the resistance of a coating to scratches introduced

by a usually hand-held loaded stylus.

The test can be carried out using a point stylus (method A) or using a disc stylus (method B).

Both methods are generally applicable and can be used in the field as well as on curved surfaces. Method

A can also be applied on small test specimens (minimum dimensions 30 mm × 50 mm).

The test can be carried out as a “pass/fail” test (test requirement I) or as a classification test (test

requirement II).
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 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore

hardness)
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 14526-1, Plastics — Phenolic powder moulding compounds (PF-PMCs) — Part 1: Designation system

and basis for specifications
CEN/TS 13388, Copper and copper alloys — Compendium of compositions and products
EN 10027-2, Designation systems for steels — Part 2: Numerical system
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
stylus
scratching tool with specified geometry
3.2
writing effect

smoothing of the surface profile of a coating by impact of a loaded stylus (3.1) being moved over the surface

© ISO 2019 – All rights reserved 1
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SIST EN ISO 22557:2021
ISO 22557:2019(E)
3.3
writing mark
gash
scratch with continuous writing effect (3.2) damage
3.4
metal marking

writing mark (3.3) which is introduced with a metal stylus (3.1) and covered with abraded stylus

material
4 Principle

A stylus loaded with a test load between 0,5 N to 20 N is manually moved over the coating surface. The

so introduced damage is visually (magnifier) examined and assessed.

The test can be carried out as method A using a point stylus (diameter 0,50 mm, 0,75 mm, or 1,00 mm)

or as method B using a disc stylus (made of stainless steel, copper, thermoset, or PMMA [Polymethyl

methacrylate]).
5 Apparatus

5.1 Hardness pen, as illustrated in Figures 1 and 2, with the following properties:

5.1.1 The pressure spring, which is compressed by the locking slider, generates the test load exerting

on the stylus. This test load can be read in newtons by means of the slider position on the scale.

In order not to change the elastic behaviour of the spring, it shall be relaxed in case the hardness pen is

not in use for any length of time.
5.1.2 The range of the test load shall be between 0,5 N to 20 N.

With regard to common hardness pens test load, ranges between 0,5 N to 3 N (graduation 0,1 N), 1,5 N

to 10 N (graduation 0,5 N) and 3 N to 20 N (graduation 1 N) are available by means of exchangeable

pressure springs.

Due to the non-linearity of the spring characteristics and the friction within the hardness pen, the

specified lower limits of the test load ranges shall not be underrun.

5.1.3 The removable head piece is the guide bush for the point stylus or the test disc holder respectively.

The test load, set by means of the slider, is effective if

— for the apparatus in accordance with Figure 1, the point stylus is pushed into the head piece so that

...

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