ISO/PRF 11909

2025-04-1708-20
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ISO/DIS 11909:2025(en)
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ISO/TC 35/WG 4
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Secretariat: NEN
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Binders for paints and varnishes — Polyisocyanate resins — General methods of test Style Definition: Default Paragraph Font
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Liants pour peintures et vernis — Résines de polyisocyanate — Méthodes générales d'essai
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ISO/DIS 11909:2025(en)
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ii
ISO/DIS 11909:2025(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Properties and test methods . 2
Annex A (normative) Determination of isocyanate (NCO) content (percentage by mass of
isocyanate groups) . 4
A.1 Principle . 4
A.2 Reagents . 4
A.3 Apparatus . 4
A.4 Sampling . 5
A.5 Procedure . 5
A.6 Expression of results . 5
A.7 Precision . 6
A.8 Test report . 6
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Properties and test methods . 2
Annex A (normative) Determination of isocyanate (NCO) content (percentage by mass of
isocyanate groups) . 4
A.1 Principle . 4
A.2 Reagents . 4
A.3 Apparatus . 4
A.4 Sampling . 5
A.5 Procedure . 5
A.6 Expression of results . 5
A.7 Precision . 6
A.8 Test report . 6

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iii
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 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/directiveswww.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)
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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
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www.iso.org/iso/foreword.htmlwww.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 11909:2007), 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.htmlwww.iso.org/members.html.

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iv
International Standard ISO 11909:2025(en)

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Binders for paints and varnishes — Polyisocyanate resins — General
methods of test
1 Scope
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
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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 648, Laboratory glassware — Single-volume pipettes
ISO 1523, Determination of flash point — Closed cup equilibrium method
ISO 2811--1, Paints and varnishes — Determination of density — Part 1: Pycnometer method
ISO 2811--2, Paints and varnishes — Determination of density — Part 2: Immersed body (plummet) method
ISO 2811--3, Paints and varnishes — Determination of density — Part 3: Oscillation method
ISO 2811--4, Paints and varnishes — Determination of density — Part 4: Pressure cup method
ISO 3219--2, Rheology — Part 2: General principles of rotational and oscillatory rheometry
ISO 3219--3, Rheology — Part 3: Test procedure and examples for the evaluation of results when using rotational
and oscillatory rheometry
ISO 3251, Paints, varnishes and plastics — Determination of non-volatile-matter content
ISO 3679, Determination of flash point – Method for flash no-flash and flash point by small scale closed cup tester
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 4630, Clear liquids — Estimation of colour by the Gardner colour scale
ISO 6271, Clear liquids — Estimation of colour by the platinum-cobalt colour scale
ISO 10283, Binders for paints and varnishes — Determination of monomeric diisocyanates in isocyanate resins
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
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ISO 11909:2025(en)
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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ISO and IEC maintain terminology databases for use in standardization at the following addresses:
numbers
— ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
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— IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
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3.1
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polyisocyanate resin
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synthetic resin, containing free or blocked isocyanate groups, based on aromatic, aliphatic or cycloaliphatic
numbers, Tab stops: 0.7 cm, Left + 1.4 cm, Left + 2.1
isocyanates
cm, Left + 2.8 cm, Left + 3.5 cm, Left + 4.2 cm, Left +
4.9 cm, Left + 5.6 cm, Left + 6.3 cm, Left + 7 cm, Left
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4 Properties and test methods
Unless otherwise agreed, the properties to be measured and the test methods to be used shall be as given in
Table 1.
Table 1 — Properties and test methods
Property Test method
Colour ISO 6271 or ISO 4630, depending on the intensity of the
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colour
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Viscosity ISO 3219--2 and ISO 3219--3
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Non-volatile matter ISO 3251, in accordance with the test conditions listed in
Table 2
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Flashpoint ISO 1523 or ISO 3679
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Density ISO 2811-1, ISO 2811-2, ISO 2811-3 or ISO 2811-4
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Isocyanate content Annex A
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Monomeric diisocyanate content ISO 10283
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Table 2 gives the test conditions for the determination of non-volatile matter content in accordance with
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ISO 3251.
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Table 2 — Test conditions for the determination of non-volatile matter content
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a
Resin basis Period of heating Test temperature
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h °C
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Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm
HDI biuret 1 80
+ 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
HDI cyanurate 1 105
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TDI and MDI polyisocyanates, 1
...