CEN ISO/TR 21555:2020

SLOVENSKI STANDARD
01-december-2020
Barve in laki - Pregled preskusnih metod za določanje trdote premazov in njihove
odpornosti proti obrabi (ISO/TR 21555:2019)
Paints and varnishes - Overview of test methods on hardness and wear resistance of
coatings (ISO/TR 21555:2019)
Beschichtungsstoffe - Überblick zu Verfahren zur Bestimmung von Härte und
Verschleißfestigkeit von Beschichtungen (ISO/TR 21555:2019)
Ta slovenski standard je istoveten z: CEN ISO/TR 21555:2020
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN ISO/TR 21555
TECHNICAL REPORT
RAPPORT TECHNIQUE
October 2020
TECHNISCHER BERICHT
ICS 87.040
English Version
Paints and varnishes - Overview of test methods on
hardness and wear resistance of coatings (ISO/TR
21555:2019)
Beschichtungsstoffe - Überblick zu Verfahren zur
Bestimmung von Härte und Verschleißfestigkeit von
Beschichtungen (ISO/TR 21555:2019)

This Technical Report was approved by CEN on 4 October 2020. It has been drawn up by the Technical Committee CEN/TC 139.

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. CEN ISO/TR 21555:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO/TR 21555:2019 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
which is held by DIN.
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.
Endorsement notice
The text of ISO/TR 21555:2019 has been approved by CEN as CEN ISO/TR 21555:2020 without any
modification.
TECHNICAL ISO/TR
REPORT 21555
First edition
2019-08
Paints and varnishes - Overview of
test methods on hardness and wear
resistance of coatings
Reference number
ISO/TR 21555:2019(E)
©
ISO 2019
ISO/TR 21555:2019(E)
© ISO 2019
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ii © ISO 2019 – All rights reserved

ISO/TR 21555:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Hardness tests . 2
4.1 Indentation tests with resting indenter . 2
4.1.1 Indentation test with Buchholz indenter. 2
4.1.2 Indentation test with Knoop indenter . 5
4.1.3 Indentation test with Pfund indenter . 6
4.1.4 Indentation test with Vickers indenter . 8
4.2 Indentation tests with oscillating indenter .10
4.2.1 Oscillation damping test with König pendulum .10
4.2.2 Oscillation damping test with Persoz pendulum .11
4.2.3 Oscillation damping test with rocker .13
5 Wear resistance tests .14
5.1 Single-scratch tests .14
5.1.1 Scratch test with pencils .14
5.1.2 Scratch test with ball stylus 1 .17
5.1.3 Scratch test with ball stylus 2 .20
5.1.4 Scratch test with conical stylus 3 .22
5.1.5 Scratch test with conical stylus 4 .25
5.1.6 Scratch test with conical stylus 5 .28
5.1.7 Scratch test with conical stylus 6 .31
5.1.8 Scratch test with disc-shaped stylus .33
5.1.9 Scratch test with U-shaped stylus .37
5.2 Multiple scratch tests .39
5.2.1 Multiple scratch test with locked abrasive wheel .39
5.2.2 Multiple scratch test with abrasive cylinder .40
5.2.3 Multiple scratch test with rotating abrasive wheels .42
5.2.4 Multiple scratch test with rotating brush .43
5.3 Dry abrasion tests .45
5.3.1 Abrasion test with locked abrasive wheel .45
5.3.2 Abrasion test with rotating abrasive wheels 1 .47
5.3.3 Abrasion test with abrasive wheels 2 .48
5.3.4 Abrasion test with rotating abrasive wheels 3 .50
5.3.5 Abrasion test with rotating abrasive wheels 4 .51
5.4 Wet abrasion tests .53
5.4.1 Scrub test with brush .53
5.4.2 Scrub test with non-woven web 1 .55
5.4.3 Scrub test with non-woven web 2 .57
5.5 Falling-sand tests .60
5.5.1 Falling-sand test with corundum granulate .60
5.5.2 Falling-sand test with quartz sand .62
Annex A (informative) Overview on test methods on hardness and wear resistance of coatings .64
Bibliography .69
ISO/TR 21555:2019(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

ISO/TR 21555:2019(E)
Introduction
The determination of the hardness and of the wear resistance is one of the most important preconditions
for evaluating the resistance of coatings to mechanical stress.
The procedures and numerical da
...