SIST EN ISO 11998:2002

SLOVENSKI STANDARD
SIST EN ISO 11998:2002
01-september-2002
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Paints and varnishes - Determination of wet-scrub resistance and cleanability of coatings
(ISO 11998:1998)
Beschichtungsstoffe - Bestimmung der Naßabriebbeständigkeit und der
Reinigungsfähigkeit von Beschichtungen (ISO 11998:1998)
Peintures et vernis - Détermination de la résistance au frottement humide et de l'aptitude
au nettoyage des revetements (ISO 11998:1998)
Ta slovenski standard je istoveten z: EN ISO 11998:2001
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 11998:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11998:2002

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SIST EN ISO 11998:2002
EUROPEAN STANDARD
EN ISO 11998
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2001
ICS 87.040
English version
Paints and varnishes - Determination of wet-scrub resistance
and cleanability of coatings (ISO 11998:1998)
Peintures et vernis - Détermination de la résistance au Beschichtungsstoffe - Bestimmung der
frottement humide et de l'aptitude au nettoyage des Naßabriebbeständigkeit und der Reinigungsfähigkeit von
revêtements (ISO 11998:1998) Beschichtungen (ISO 11998:1998)
This European Standard was approved by CEN on 29 June 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11998:2001 E
worldwide for CEN national Members.

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SIST EN ISO 11998:2002
EN ISO 11998:2001 (E)
CORRECTED 2001-09-19
Foreword
The text of the International Standard from Technical Committee ISO/TC 35 "Paints and
varnishes" of the International Organization for Standardization (ISO) has been taken over as an
European Standard 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 February 2002, and conflicting national
standards shall be withdrawn at the latest by February 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of the International Standard ISO 11998:1998 has been approved by CEN as a
European Standard without any modification.
NOTE: Normative references to International Standards are listed in annex ZA (normative).
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SIST EN ISO 11998:2002
EN ISO 11998:2001 (E)
Annex ZA (normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN/HD Year
ISO 1513 1992 Paints and varnishes — Examination EN ISO 1513 1994
and preparation of samples for
testing
ISO 2808 1997 Paints and varnishes — EN ISO 2808 1999
Determination of film thickness
ISO 3270 1984 Paints and varnishes and their raw EN 23270 1991
materials — Temperatures and
humidities for conditioning and
testing
ISO 3696 1987 Water for analytical laboratory use — EN ISO 3696 1995
Specification and test methods
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SIST EN ISO 11998:2002

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SIST EN ISO 11998:2002
INTERNATIONAL ISO
STANDARD 11998
First edition
1998-08-01
Paints and varnishes — Determination of
wet-scrub resistance and cleanability of
coatings
Peintures et vernis — Détermination de la résistance au frottement humide
et de l'aptitude au nettoyage des revêtements
A
Reference number
ISO 11998:1998(E)

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SIST EN ISO 11998:2002
ISO 11998:1998(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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 11998 was prepared by Technical Committee
ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test
methods for paints and varnishes.
Annex A forms an integral part of this International Standard.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii

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SIST EN ISO 11998:2002
©
INTERNATIONAL STANDARD  ISO ISO 11998:1998(E)
Paints and varnishes — Determination of wet-scrub resistance and
cleanability of coatings
1 Scope
The ability of coatings to withstand wear caused by repeated cleaning operations and to resist
permanent blemishing by stains is an important consideration both from a practical point of view and
when comparing and rating such coatings. This International Standard specifies an accelerated method
for the determination of wet-scrub resistance. With regard to the cleanability of coatings, only the
method itself and not the soiling agents are specified.
NOTE — Since these properties depend not only on the quality of a coating but also on the substrate, the method of
application, the drying conditions and other factors, the results obtained are not directly transferable to actual
practice. In this standard the evaluation of the coating is based on a defined substrate, a fixed application method,
specified drying conditions and a defined method of wet scrubbing.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of
this International Standard. At the time of publication, the editions indicated were valid. All standards are
subject to revision, and parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the standards indicated below.
Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 1512:1991,
Paints and varnishes — Sampling of products in liquid and paste form.
ISO 1513:1992, Paints and varnishes — Examination and preparation of samples for testing.
ISO 2808:1997, Paints and varnishes — Determination of film thickness.
ISO 3270:1984, Paints and varnishes and their raw materials — Temperatures and humidities for
conditioning and testing.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
3 Definitions
For the purposes of this International Standard, the following definitions apply.
3.1 cleanability: The ability of a dry coating film to withstand penetration by soiling agents and to be
freed from them through the cleaning process without removing more than a defined film thickness.
3.2 scrub cycle: One reciprocal movement of the scrub pad over the full stroke length in both
directions.
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SIST EN ISO 11998:2002
©
ISO
ISO 11998:1998(E)
3.3 stroke length: The total distance, end to end, traversed by the scrub pad in a scrub testing
machine.
3.4 wet-scrub resistance: The ability of a dry coating film to sustain less than a specified loss in film
thickness, averaged over a defined area, when exposed to 200 wet-scrub cycles.
4 Principle
The test coating is applied to a test panel using a film applicator at the specified gap clearance. After
drying and conditioning, the coated panel is weighed and subjected to 200 wet-scrub cycles in a scrub
testing machine. It is then washed, dried and weighed again to determine its loss in mass, from which
the mean loss in film thickness is calculated.
For the determination of cleanability, soiling agents are applied to similarly prepared coated panels. The
soiling agents specified are left in contact with the coating film for a specified time. The coated, soiled
panels are then subjected to 200 wet-scrub cycles.
Through comparison of the mean loss in film thickness with a specified value, as agreed between
interested parties, the coating can be rated in wet-scrub resistance classes.
When the applied soiling agent is observed to be removed and the coating is wet-scrub resistant, the
coating is said to be cleanable in terms of the soiling agent used.
5 Reagents
5.1 Washing liquid
Use a 2,5 g/l solution of sodium -dodecylbenzenesulfonate in water of grade 3 purity as defined in
n
ISO 3696. The solution shall be allowed to stand before use until all air-bubbles and foam have
dissipated.
5.2 Soiling agents
The soiling agents and manner of application shall be agreed between the interested parties.
6 Apparatus
1)
6.1 Test panel, made of PVC film free of migration-susceptible chemical plasticizers, of sufficient
rigidity to ensure a flat surface, impervious to and unaffected by water or aliphatic organic solvents and
of nominal thickness 0,25 mm, 430 mm long and not less than 80 mm wide.
Other types of plastic film may be used where the coating contains solvent which may adversely affect
the PVC film. If the coating delaminates before or during the test, another, more suitable substrate shall
be used.
6.2 Film applicator (preferably an automatic film applicator), used at an application speed of 10
...