ISO 6270-3:2018

Paints and varnishes - Determination of resistance to humidity - Part 3: Condensation (in-cabinet exposure with heated, bubbling water reservoir)

ISO 6270-3:2018 specifies the general conditions and procedures to be observed when testing coated test specimens in constant condensation water atmospheres in order to ensure that the results of tests carried out in different laboratories are reproducible. NOTE The shape and preparation of the test specimens, the duration of the test and the assessment of the test results are not covered in this document.

Peintures et vernis — Détermination de la résistance à l'humidité — Partie 3: Condensation (exposition dans une étuve avec barboteur chauffé)

General Information

• Status: Published
• Publication Date: 07-Jan-2018
• ICS: 87.040 - Paints and varnishes
• Technical Committee: ISO/TC 35/SC 9 - General test methods for paints and varnishes
• Drafting Committee: ISO/TC 35/SC 9/WG 31 - Properties after application
• Current Stage: 9093 - International Standard confirmed
• Start Date: 08-Aug-2023
• Completion Date: 13-Dec-2025

Overview

ISO 6270-3:2018 - Paints and varnishes - Determination of resistance to humidity - Part 3: Condensation (in-cabinet exposure with heated, bubbling water reservoir) defines standardized conditions and procedures for subjecting coated test specimens to a constant condensation water atmosphere. The document establishes reproducible test atmospheres (supersaturated vapor produced by bubbling compressed air through heated water) and apparatus requirements to produce continuous condensation on coated surfaces. Note: specimen shape/preparation, test duration and final assessment methods are not prescribed by this part.

Key topics and technical requirements

• Principle: Compressed air is bubbled through heated water to introduce saturated vapour into a chamber, creating continuous condensation on specimens; rotation promotes uniform deposition.
• Apparatus components: chamber, heated water reservoir (deionized/distilled water), air supplier and filter, specimen rack (fixed or rotating), temperature control, condensate drip pan and corrosion‑resistant construction.
• Control parameters:
  • Typical test temperature: 49 ± 2 °C (alternative 80 ± 2 °C by agreement).
  • Relative humidity: >95% (supersaturated conditions).
  • Water reservoir level: 205 ± 5 mm.
  • Rotating rack speed (if used): 0.33 ± 0.02 r/min.
  • Air mass flow: typically about 3 × chamber volume per hour; compressed air must be oil‑free.
• Specimens: default substrate burnished steel per ISO 1514; typical dimensions 75 × 150 mm; coating thickness measured per ISO 2808; condition specimens per ISO 3270.
• Test conduct: mount specimens (use substitutes for empty slots), avoid drips from chamber walls, do not interrupt the prescribed test period.
• Evaluation & reporting: evaluate deterioration using appropriate methods such as ISO 4628; required test report items include product ID, apparatus type, temperature/humidity, coating thickness, drying/ageing conditions, deviations and results.

Practical applications and users

ISO 6270-3:2018 is used for:

• Objective humidity/condensation stress testing of protective coatings and varnishes.
• Comparative laboratory testing for quality control, R&D and product specifications.
• Assessing coating performance relevant to corrosion protection in humid environments.

Typical users:

• Coating manufacturers, R&D laboratories and QC teams
• Automotive, marine, construction and industrial specifiers evaluating humidity resistance
• Test laboratories performing standardized environmental exposure tests

Related standards

• ISO 1514 - Standard panels for testing
• ISO 2808 - Determination of film thickness
• ISO 3270 - Temperatures and humidities for conditioning and testing
• ISO 4618 - Terms and definitions for paints and varnishes

Keywords: ISO 6270-3:2018, paints and varnishes, condensation testing, humidity resistance test, in-cabinet exposure, heated bubbling water reservoir, rotating specimen rack, corrosion protection testing.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6270-3
First edition
2018-01
Paints and varnishes — Determination
of resistance to humidity —
Part 3:
Condensation (in-cabinet exposure
with heated, bubbling water
reservoir)
Peintures et vernis — Détermination de la résistance à l'humidité —
Partie 3: Condensation (exposition dans une étuve avec barboteur
chauffé)
Reference number
©
ISO 2018
© ISO 2018
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
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Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Limitations . 2
6 Apparatus . 2
7 Test specimens. 3
7.1 Material and dimensions . 3
7.2 Preparation and coating . . 4
7.3 Drying and conditioning . 4
7.4 Thickness of coating . 4
8 Procedure. 4
8.1 Arrangement of test specimens . 4
8.2 Start-up . 5
8.3 Set of test specimens . 5
8.4 Duration of test . 5
9 Evaluation . 5
10 Precision . 5
11 Test report . 5
Bibliography . 7
Foreword
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electrotechnical standardization.
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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
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URL: 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.
A list of all parts in the ISO 6270 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

Introduction
This document is intended to give consistent conditions and procedures for the conditioning of pre-
prepared test specimens which are to be evaluated for defects which 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 in accordance with documents, such as the
appropriate part(s) of ISO 4628, or by procedures agreed between the interested parties.
INTERNATIONAL STANDARD ISO 6270-3:2018(E)
Paints and varnishes — Determination of resistance to
humidity —
Part 3:
Condensation (in-cabinet exposure with heated, bubbling
water reservoir)
1 Scope
This document specifies the general conditions and procedures to be observed when testing coated
test specimens in constant condensation water atmospheres in order to ensure that the results of tests
carried out in different laboratories are reproducible.
NOTE The shape and preparation of the test specimens, the duration of the test and the assessment of the
test results are not covered in this document.
2 Normative references
The following
...