EN ISO 11909:2025

Binders for paints and varnishes - Polyisocyanate resins - General methods of test (ISO 11909:2025)

This document provides general test methods for polyisocyanate resins and solutions of polyisocyanate resins intended for use as binders in paints, varnishes and related products.

Bindemittel für Beschichtungsstoffe - Polyisocyanatharze - Allgemeine Prüfverfahren (ISO 11909:2025)

Liants pour peintures et vernis - Résines de polyisocyanate - Méthodes générales d'essai (ISO 11909:2025)

Le présent document indique les méthodes générales d’essai pour les résines de polyisocyanate et leurs solutions destinées à être utilisées en tant que liants dans les peintures, vernis et produits assimilés.

Veziva za barve in lake - Poliizocianatne smole - Splošne preskusne metode (ISO/DIS 11909:2025)

General Information

• Status: Published
• Publication Date: 21-Oct-2025
• ICS: 87.060.20 - Binders
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 22-Oct-2025
• Completion Date: 22-Oct-2025
• Ref Project: SIST EN ISO 11909:2026 - Binders for paints and varnishes - Polyisocyanate resins - General methods of test (ISO/DIS 11909:2025)

Relations

• Replaces: EN ISO 11909:2007 - Binders for paints and varnishes - Polyisocyanate resins - General methods of test (ISO 11909:2007)
• Effective Date: 19-Jun-2024

Overview

EN ISO 11909:2025 is an international standard developed by CEN and ISO, specifying general methods of test for polyisocyanate resins used as binders in paints, varnishes, and related coating products. This standard provides robust procedures to evaluate key properties of polyisocyanate resins - essential components in industrial coatings - ensuring product quality, consistency, and regulatory compliance.

As polyisocyanate resins are integral to producing durable and high-performance paints and varnishes, EN ISO 11909:2025 supports manufacturers, laboratories, and quality controllers in performing standardized and reliable testing. The standard replaces the previous edition ISO 11909:2006 and reflects updated technical improvements such as potentiometric titration for better accuracy.

Key Topics

• Scope: Defines test methods for polyisocyanate resins and their solutions destined for use as binders in paints and varnishes.
• Tested Properties:
  • Colour (ISO 6271, ISO 4630)
  • Viscosity (ISO 3219-2, ISO 3219-3)
  • Non-volatile matter content (ISO 3251)
  • Flashpoint (ISO 1523, ISO 3679)
  • Density (various ISO 2811 methods)
  • Isocyanate content (normative Annex A)
  • Monomeric diisocyanate content (ISO 10283)
• Isocyanate Content Determination:
  • Reaction with dibutylamine followed by titration with hydrochloric acid.
  • Techniques include visual endpoint detection using bromophenol blue or potentiometric titration for coloured resins.
• Sampling: Adheres to ISO 15528 guidelines for obtaining representative product samples.
• Precision and Reporting: Provides repeatability and reproducibility data for tests to ensure reliability; mandates thorough documentation of testing conditions and results.

Applications

EN ISO 11909:2025 is critical for:

• Industrial Paint & Varnish Manufacturing: Ensuring raw binder materials meet stringent quality standards before formulation.
• Quality Control Laboratories: Performing routine and acceptance testing of polyisocyanate resins.
• Research & Development: Characterizing resin properties to develop improved coatings with enhanced durability, chemical resistance, and aesthetic qualities.
• Regulatory Compliance: Supporting conformity assessment under relevant international and national regulations governing paints and varnishes.
• Supplier Qualification and Verification: Standardized testing facilitates supplier certification and incoming material inspection.

This standard benefits all stakeholders in the coatings supply chain by promoting consistent material performance, reducing variability, and enhancing product safety.

Related Standards

• ISO 648: Laboratory glassware specifications used in testing.
• ISO 6353, ISO 2811 series: Density determination methods.
• ISO 3219 parts 2 and 3: Rheological testing procedures.
• ISO 3251: Methods to measure non-volatile matter content.
• ISO 3679, ISO 1523: Flashpoint measurement standards.
• ISO 10283: Determination of monomeric diisocyanates in resins.
• ISO 15528: Sampling procedures for paints and varnishes.
• ISO 4618:2023: Vocabulary for paints and varnishes terminology.

Integrating these standards ensures comprehensive test coverage and harmonized terminology in quality control processes for polyisocyanate-based binders.

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Keywords: EN ISO 11909:2025, polyisocyanate resins, binders for paints, varnishes, test methods, paint binder testing, isocyanate content, viscosity testing, flashpoint determination, paint industry standards, quality control paints, varnish binders, non-volatile matter content.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 11909:2025
01-marec-2025
Veziva za barve in lake - Poliizocianatne smole - Splošne preskusne metode
(ISO/DIS 11909:2025)
Binders for paints and varnishes - Polyisocyanate resins - General methods of test
(ISO/DIS 11909:2025)
Bindemittel für Beschichtungsstoffe - Polyisocyanatharze - Allgemeine Prüfverfahren
(ISO/DIS 11909:2025)
Liants pour peintures et vernis - Résines de polyisocyanate - Méthodes générales
d'essai (ISO/DIS 11909:2025)
Ta slovenski standard je istoveten z: prEN ISO 11909
ICS:
87.060.20 Veziva Binders
oSIST prEN ISO 11909:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 11909:2025
oSIST prEN ISO 11909:2025
DRAFT
International
Standard
ISO/DIS 11909
ISO/TC 35
Binders for paints and varnishes —
Secretariat: NEN
Polyisocyanate resins — General
Voting begins on:
methods of test
2025-01-17
Liants pour peintures et vernis — Résines de polyisocyanate —
Voting terminates on:
Méthodes générales d'essai
2025-04-11
ICS: 87.060.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 11909:2025(en)
oSIST prEN ISO 11909:2025
DRAFT
ISO/DIS 11909:2025(en)
International
Standard
ISO/DIS 11909
ISO/TC 35
Binders for paints and varnishes —
Secretariat: NEN
Polyisocyanate resins — General
Voting begins on:
methods of test
Liants pour peintures et vernis — Résines de polyisocyanate —
Voting terminates on:
Méthodes générales d'essai
ICS: 87.060.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 11909:2025(en)
ii
oSIST prEN ISO 11909:2025
ISO/DIS 11909:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Properties and test methods . 2
Annex A (normative) Determination of isocyanate content (percentage by mass of isocyanate
groups) . 3
Bibliography . 6

iii
oSIST prEN ISO 11909:2025
ISO/DIS 11909:2025(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 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).
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
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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, 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 11909:2006), which has been technically
revised.
The main changes are as follows:
— in A.5, potentiometric titration has been introduced as a general alternative to titration using a colour
indicator, not only in the case of highly coloured resins;
— CAS-numbers have been added to the reagents;
— the normative references have been updated.
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
oSIST prEN ISO 11909:2025
DRAFT International Standard ISO/DIS 11909:2025(en)
Binders for paints and varnishes — Polyisocyanate resins —
General methods of test
1 Scope
This document details general test methods for polyisocyanate resins and solutions of polyisocyanate resins
intended for use as binders in paints, varnishes a
...