EN ISO 6270-2:2025

Paints and varnishes - Determination of resistance to humidity - Part 2: Condensation (in-cabinet exposure with heated water reservoir) (ISO 6270-2:2025)

This document specifies the general conditions and procedures observed when testing coated test specimens by exposing them to constant condensation-water atmospheres or alternating condensation-water atmospheres, in a cabinet with a heated water reservoir. These conditions and procedures ensure that the results of tests carried out in different laboratories are reproducible.
This document does not cover the shape and preparation of the test specimens, the duration of the test and the assessment of the test results.

Beschichtungsstoffe - Bestimmung der Beständigkeit gegen Luftfeuchte - Teil 2: Kondensation (Beanspruchung in einer Klimakammer mit geheiztem Wasserbehälter) (ISO 6270‑2:2025)

Dieses Dokument legt die allgemeinen Bedingungen und Verfahren fest, die bei der Prüfung beschichteter Probenkörper eingehalten werden, wenn diese in einer Klimakammer mit geheiztem Wasserbehälter Kondenswasser-Konstantklimaten oder Kondenswasser-Wechselklimaten ausgesetzt werden. Diese Bedingungen und Verfahren stellen die Vergleichbarkeit der Ergebnisse von Prüfungen in unterschiedlichen Laboren sicher.
Dieses Dokument behandelt nicht die Form und Vorbereitung der Probenkörper, die Prüfdauer und die Bewertung der Prüfergebnisse.

Peintures et vernis - Détermination de la résistance à l’humidité - Partie 2: Condensation (exposition en enceinte avec réservoir à eau chauffée) (ISO 6270-2:2025)

Le présent document spécifie les conditions et modes opératoires généraux respectés lors de l’essai sur des éprouvettes revêtues, en les exposant à des atmosphères de condensation constante d’eau ou à des atmosphères de condensation alternée d’eau, dans une enceinte avec un réservoir à eau chauffée. Ces conditions et modes opératoires permettent de s’assurer de la reproductibilité des résultats d’essais réalisés dans différents laboratoires.
Le présent document ne traite pas de la forme et de la préparation des éprouvettes, de la durée de l’essai et de l’évaluation des résultats de l’essai.

Barve in laki - Določanje odpornosti proti vlagi - 2. del: Kondenzacija (izpostavljenost v komori z ogrevanim rezervoarjem z vodo) (ISO 6270-2:2025)

Ta dokument določa splošne pogoje in postopke, ki jih je treba upoštevati pri preskušanju premazanih preskusnih vzorcev z izpostavljanjem atmosferam s stalno prisotno ali izmenjujočo se kondenzacijo/vlago, v komori z ogrevanim rezervoarjem z vodo. Ti pogoji in postopki zagotavljajo ponovljivost rezultatov preskusov, izvedenih v različnih laboratorijih. Ta dokument ne zajema oblike in priprave preskusnih vzorcev, trajanja preskusa in ocenjevanja rezultatov preskusa.

General Information

• Status: Published
• Publication Date: 01-Jul-2025
• ICS: 87.040 - Paints and varnishes
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 02-Jul-2025
• Completion Date: 02-Jul-2025
• Ref Project: SIST EN ISO 6270-2:2025 - Paints and varnishes - Determination of resistance to humidity - Part 2: Condensation (in-cabinet exposure with heated water reservoir) (ISO 6270-2:2025)

Relations

• Replaces: EN ISO 6270-2:2018 - Paints and varnishes - Determination of resistance to humidity - Part 2: Condensation (in-cabinet exposure with heated water reservoir) (ISO 6270-2:2017)
• Effective Date: 21-Jun-2023

Overview

EN ISO 6270-2:2025 - "Paints and varnishes - Determination of resistance to humidity - Part 2: Condensation (in-cabinet exposure with heated water reservoir)" - defines reproducible test conditions and procedures for exposing coated test specimens to condensation-water atmospheres inside a climatic cabinet with a heated water reservoir. The standard establishes how to create constant or alternating condensation atmospheres so results from different laboratories are comparable. It does not cover specimen shape, preparation, test duration or result assessment.

Key topics and requirements

• Test atmospheres (designation):
  • CH - Condensation with constant humidity
  • AHT - Alternating humidity and air temperature
  • AT - Alternating air temperature
  • IC - Intermittent condensation (newly included from ISO 11503)
• Apparatus and setup: requirements for a climatic chamber, installation, and a heated water reservoir; devices for accommodating specimens and ensuring chamber ventilation and loading are appropriate.
• Procedure elements: start-up, specimen arrangement and spacing (now recommendations rather than strict requirements), filling of floor trough, verification of condensation formation (simplified procedure included), defined test sequences (CH, AHT, AT, IC), permitted interruptions and end-of-test handling.
• Evaluation and precision: guidance on recording conditions and reporting to support reproducibility between laboratories; normative references and annex for condensation-water comparison quantity.
• Normative references and terminology: references include ISO 3270 (conditioning temperatures/humidities) and ISO 4618 (vocabulary).

Practical applications

• Assessing humidity resistance of coatings and varnishes used on metal, wood and other substrates.
• Quality control and batch verification in paint manufacturing.
• Comparative performance testing during product development and R&D.
• Supporting claims for corrosion protection and environmental durability.
• Providing standardized conditioning prior to further evaluation (e.g., visual assessment using ISO 4628 series or contract-specific assessment methods).

Who should use this standard

• Coating and paint manufacturers (quality, R&D, product development).
• Independent testing and certification laboratories performing humidity/condensation tests.
• OEMs and specifiers who require validated humidity-resistance data for material selection.
• Regulatory bodies and procurement teams needing harmonized test methods for tendering and compliance.

Related standards

• ISO 3270 - Conditioning temperatures and humidities for paints and varnishes
• ISO 4618 - Paints and varnishes - Vocabulary
• ISO 4628 series - Examples of visual evaluation methods (assessment methods often used after conditioning)

Keywords: EN ISO 6270-2:2025, resistance to humidity, condensation test, in-cabinet exposure, heated water reservoir, paints and varnishes testing, climatic chamber, humidity resistance testing, intermittent condensation.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN ISO 6270-2:2018
Barve in laki - Določanje odpornosti proti vlagi - 2. del: Kondenzacija
(izpostavljenost v komori z ogrevanim rezervoarjem z vodo) (ISO 6270-2:2025)
Paints and varnishes - Determination of resistance to humidity - Part 2: Condensation
(in-cabinet exposure with heated water reservoir) (ISO 6270-2:2025)
Beschichtungsstoffe - Bestimmung der Beständigkeit gegen Luftfeuchte - Teil 2:
Kondensation (Beanspruchung in einer Klimakammer mit geheiztem Wasserbehälter)
(ISO 6270-2:2025)
Peintures et vernis - Détermination de la résistance à l’humidité - Partie 2: Condensation
(exposition en enceinte avec réservoir à eau chauffée) (ISO 6270-2:2025)
Ta slovenski standard je istoveten z: EN ISO 6270-2:2025
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 6270-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 87.040 Supersedes EN ISO 6270-2:2018
English Version
Paints and varnishes - Determination of resistance to
humidity - Part 2: Condensation (in-cabinet exposure with
heated water reservoir) (ISO 6270-2:2025)
Peintures et vernis - Détermination de la résistance à Beschichtungsstoffe - Bestimmung der Beständigkeit
l'humidité - Partie 2: Condensation (exposition en gegen Feuchtigkeit - Teil 2: Kondensation
enceinte avec réservoir à eau chauffée) (ISO 6270- (Beanspruchung in einer Klimakammer mit geheiztem
2:2025) Wasserbehälter) (ISO 6270-2:2025)
This European Standard was approved by CEN on 27 June 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6270-2:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6270-2:2025) 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 January 2026, and conflicting national standards shall
be withdrawn at the latest by January 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 6270-2:2018.
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 6270-2:2025 has been approved by CEN as EN ISO 6270-2:2025 without any
modification.
International
Standard
ISO 6270-2
Third edition
Paints and varnishes —
2025-06
Determination of resistance to
humidity —
Part 2:
Condensation (in-cabinet exposure
with heated water reservoir)
Peintures et vernis — Détermination de la résistance à
l’humidité —
Partie 2: Condensation (exposition en enceinte avec réservoir à
eau chauffée)
Reference number
ISO 6270-2:2025(en) © ISO 2025

ISO 6270-2:2025(en)
© ISO 2025
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 6270-2:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designation . 1
5 Limitations . 2
6 Principle . 2
7 Test atmospheres . 2
8 Apparatus . 3
8.1 Climatic chamber . .3
8.2 Installation of the climatic chamber .4
8.3 Device for accommodating the test specimens .5
9 Procedure . 5
9.1 Filling the floor trough .5
9.2 Test specimens.5
9.3 Arrangement of the test specimens .5
9.4 Visual verification of condensation formation .5
9.5 Test sequence .6
9.5.1 Start-up .6
9.5.2 Condensation atmosphere with constant humidity (CH) .6
9.5.3 Condensation atmosphere with alternation of humidity and air temperature
(AHT) .6
9.5.4 Condensation atmosphere with alternation of air temperature (AT) .6
9.5.5 Intermittent condensation (IC) .6
9.6 Interruptions .7
9.7 End of test .7
10 Evaluation . 7
11 Precision . 7
12 Test report . 7
Annex A (normative) Determination of the comparison quantity of condensation water. 9
Bibliography .10

iii
ISO 6270-2:2025(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 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 third edition cancels and replaces the second edition (ISO 6270-2:2017) and ISO 11503:1995, which
have been technically revised.
The main changes are as follows:
— intermittent condensation (IC) cycle from ISO 11503 has been added;
— chamber ventilation and specimen loading requirements have been clarified;
— spacing requirements for specimens have been changed from required to recommendations, and the
objective of spacing has been clarified;
— a simplified procedure has been added for condensation verification, and the previous procedure has
been moved to Annex A;
— the normative references have been updated.
A list of all parts in the ISO 6270 series can be found on the ISO website.
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 6270-2:2025(en)
Introduction
This document is intended to give consistent conditions and procedures for the conditioning of pre-prepared
test specimens which are evaluated for defects. Such defects can develop when they are subjected to humid
ambient atmospheres such as constant condensation-water atmospheres or alternating condensation-water
atmospheres.
The tests are designed to clarify the behaviour of the test specimens in humid ambient atmospheres and
to pinpoint any defects in the protection of the test specimens against corrosion. The testing of coatings in
these atmospheres does not necessarily give lifetime prediction data.
After conditioning, the test specimens are evaluated either according to agreed documents [e.g. the
appropriate part(s) of the ISO 4628 series] or by procedures agreed between the interested parties.

v
International Standard ISO 6270-2:2025(en)
Paints and varnishes — Determination of resistance to
humidity —
Part 2:
Condensation (in-cabinet exposure with heated water
reservoir)
1 Scope
This document specifies the general conditions and procedures observed when testing coated test
specimens by exposing them to constant condensation-water atmospheres or alternating condensation-
water atmospheres, in a cabinet with a heated water reservoir. These conditions and procedures ensure that
the results of tests carried out in different laboratories are reproducible.
This document does not cover the shape and preparation of the test specimens, the duration of the test and
the assessment of the test results.
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 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning and testing
ISO 4618, Paints and varnishes — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
ISO and IEC maintain termino
...