SIST EN ISO 29601:2026

SLOVENSKI STANDARD
01-junij-2026
Nadomešča:
SIST EN ISO 29601:2012
Barve in laki - Korozijska zaščita z zaščitnimi premaznimi sistemi - Ocenjevanje
poroznosti suhega filma (ISO 29601:2026)
Paints and varnishes - Corrosion protection by protective paint systems - Assessment of
porosity in a dry film (ISO 29601:2026)
Beschichtungsstoffe - Korrosionsschutz durch Beschichtungssysteme - Beurteilung der
Porosität einer trockenen Beschichtung (ISO 29601:2026)
Peintures et vernis Anticorrosion par systèmes de peinture - Évaluation de la porosité
d'un feuil sec (ISO 29601:2026)
Ta slovenski standard je istoveten z: EN ISO 29601:2026
ICS:
25.220.20 Površinska obdelava Surface treatment
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 29601
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2026
EUROPÄISCHE NORM
ICS 87.020 Supersedes EN ISO 29601:2011
English Version
Paints and varnishes - Corrosion protection by protective
paint systems - Assessment of porosity in a dry film (ISO
29601:2026)
Peintures et vernis Anticorrosion par systèmes de Beschichtungsstoffe - Korrosionsschutz durch
peinture - Évaluation de la porosité d'un feuil sec (ISO Beschichtungssysteme - Beurteilung der Porosität
29601:2026) einer trockenen Beschichtung (ISO 29601:2026)
This European Standard was approved by CEN on 27 April 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29601:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 29601:2026) 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 October 2026, and conflicting national standards shall
be withdrawn at the latest by October 2026.
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 29601:2011.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 29601:2026 has been approved by CEN as EN ISO 29601:2026 without any modification.

International
Standard
ISO 29601
Second edition
Paints and varnishes — Corrosion
2026-04
protection by protective paint
systems — Assessment of porosity
in a dry film
Peintures et vernis — Anticorrosion par systèmes de peinture —
Évaluation de la porosité d'un feuil sec
Reference number
ISO 29601:2026(en) © ISO 2026
ISO 29601:2026(en)
© ISO 2026
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 29601:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Test equipment . 2
5.1 Low-voltage pinhole detectors .2
5.1.1 General .2
5.1.2 Electric path .2
5.1.3 Sensitivity and alarm .2
5.1.4 Conductive liquid .2
5.2 High-voltage holiday detectors .3
5.2.1 General .3
5.2.2 Electrical source .3
5.2.3 Electrical path .3
5.2.4 Alarm .3
5.2.5 Controlled output voltage.3
6 Procedure . 3
6.1 Selection of test method .3
6.2 Low-voltage pinhole detection .4
6.2.1 Test voltage.4
6.2.2 Paint conditions before testing .4
6.2.3 Wetting agent .4
6.2.4 Preparation before testing .4
6.2.5 Testing .4
6.3 High-voltage holiday detection .4
6.3.1 Paint conditions before testing .4
6.3.2 Test voltage settings and calculation .5
6.3.3 Output voltage verification .5
6.3.4 Preparation before testing .5
6.3.5 Testing .5
7 Expression of results . 5
8 Test report . 5
Annex A (normative) Mean dry-film thicknesses and corresponding test voltages . 7
Bibliography . 9

iii
ISO 29601:2026(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 14, Protective paint systems for steel structures, 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 second edition cancels and replaces the first edition (ISO 29601:2011), which has been technically
revised.
The main changes are as follows:
— general (editorial) update of terminology;
— update on cleaning procedure before measurement;
— update on verification of test equipment;
— update on voltage calculation;
— low voltage measurement was confirmed.
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 29601:2026(en)
Introduction
This document supplements the ISO 12944 series with regard to the detection of porosity in a dry film. If
specified or agreed, this document can also be used for other applications.
The objective of this document is to achieve uniformity of practice for the detection of porosity in a dry film.
The methods chosen entail the detection of porosity using one of two types of equipment, a low-voltage
pinhole detector or a high-voltage holiday detector.
This document complements the following International Standards:
— ISO 19840, which concerns the measurement of the thickness of dry films on rough surfaces;
— ISO 16276-1, which concerns the measurement of the adhesion of a coating by pull-off testing;
— ISO 16276-2, which concerns the measurement of the adhesion by cross-cut and X-cut testing.

v
International Standard ISO 29601:2026(en)
Paints and varnishes — Corrosion protection by protective
paint systems — Assessment of porosity in a dry film
1 Scope
This document specifies procedures for detecting the presence of porosity in a protective paint system of
any thickness on a steel or other metallic substrate. The procedures given in this document are based on
methods using two different types of test equipment, the choice of equipment depending on the dry-film
thickness. These procedures are only applicable to the testing of electrically non-conductive parts of a paint
system.
The test methods specified are mainly intended for use with new coatings, but
...