SIST EN ISO 787-25:2019

General methods of test for pigments and extenders - Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO 787-25:2019)

This document specifies a general test method for comparing the colour, in full-shade systems, of white, black or coloured pigments with that of an agreed reference pigment, using a colorimetric procedure.

Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Vergleich der Farbe von Weiß-, Schwarz- und Buntpigmenten in Purton-Systemen - Teil 25: Farbmetrisches Verfahren (ISO 787-25:2019)

Méthodes générales d'essai des pigments et matières de charge - Partie 25: Comparaison, dans les systèmes monopigmentaires, de la couleur des pigments blancs, noirs et colorés - Méthode colorimétrique (ISO 787-25:2019)

Le présent document spécifie une méthode d'essai générale pour comparer, dans les systèmes monopigmentaires, la couleur des pigments blancs, noirs ou colorés avec celle d'un pigment de référence convenu, en utilisant une méthode colorimétrique.

Splošne metode preskušanja pigmentov in polnil - 25. del: Primerjava barve (full-shade) belih, črnih in barvnih pigmentov - Kolorimetrična metoda (ISO 787-25:2019)

Ta dokument določa splošno preskusno metodo za primerjavo barve (full-shade) belih,
črnih in barvnih pigmentov z dogovorjenim referenčnim pigmentom z uporabo kolorimetričnega postopka.

General Information

• Status: Published
• Public Enquiry End Date: 01-Jul-2018
• Publication Date: 08-Apr-2019
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: PIP - Pigments and extenders
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Mar-2019
• Due Date: 19-May-2019
• Completion Date: 09-Apr-2019
• Ref Project: EN ISO 787-25:2019 - General methods of test for pigments and extenders - Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO 787-25:2019)

Relations

• Replaces: SIST EN ISO 787-25:2007 - General methods of test for pigments and extenders - Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO 787-25:1993)
• Effective Date: 01-May-2019

Overview

EN ISO 787-25:2019 - "General methods of test for pigments and extenders - Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method" - specifies a standardized, reproducible colorimetric procedure to compare the colour of a test pigment with an agreed reference pigment in full‑shade (hiding) systems. The method uses dispersed pigment specimens prepared in a defined test medium (an alkyd resin and fumed silica mix) and measures tristimulus values for quantitative colour comparison.

Key topics and technical requirements

• Scope and principle: Comparison of white, black or coloured pigments in full‑shade systems using a colorimetric procedure; measurement of tristimulus values and calculation of colour characteristics.
• Test medium and materials: Uses an alkyd resin binder blended with fumed silica as the specified medium for dispersion.
• Dispersion and apparatus: Pigments are dispersed using an automatic muller (or equivalent dispersion equipment); specific apparatus and sample substrates are defined to ensure repeatability.
• Specimen preparation: Procedures for preparing test portions and test specimens for white, black and coloured pigments (mass tone/full shade distinctions are covered).
• Measurements and calculations:
  • Tristimulus measurements as described in ISO 18314-1 (analytical colorimetry).
  • For white/black pigments: relative hue and amount of relative hue, plus lightness difference.
  • For coloured pigments: lightness, hue, chroma and total colour difference using methods aligned with ISO colourimetry practice (ISO 11664-4 referenced).
• Sampling, expression of results and reporting: Includes requirements for sampling, reporting test conditions and expressing results numerically for quality control and specification.

Practical applications

• Quality control and batch acceptance testing for pigment manufacturers and extenders.
• Comparative colour specification when substituting pigments in paints, coatings and inks.
• R&D and formulation work where objective full‑shade colour matching is required (mass tone vs full shade assessment).
• Regulatory or procurement specifications that require standardized, reproducible colour comparison data.

Who should use this standard

• Pigment and extender manufacturers
• Paint, coatings and ink formulators
• Laboratory technicians in QC/QA roles
• Standards bodies and procurement specialists specifying pigment performance

Related standards

• ISO 18314-1 / ISO 18314-2 (Analytical colorimetry)
• ISO 11664-4 (Colour calculations)
• Other parts of the ISO 787 series (e.g., ISO 787-24 for photometric methods)
• ISO 18451 series (terminology for pigments, dyestuffs and extenders)

Keywords: EN ISO 787-25:2019, colorimetric method, pigments and extenders, full-shade systems, colour comparison, pigment testing, paint quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2019
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SIST EN ISO 787-25:2007
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General methods of test for pigments and extenders - Part 25: Comparison of the colour,
in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO
787-25:2019)
Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Vergleich der Farbe von Weiß-,
Schwarz- und Buntpigmenten in Purton-Systemen - Teil 25: Farbmetrisches Verfahren
(ISO 787-25:2019)
Méthodes générales d'essai des pigments et matières de charge - Partie 25:
Comparaison, dans les systèmes monopigmentaires, de la couleur des pigments blancs,
noirs et colorés - Méthode colorimétrique (ISO 787-25:2019)
Ta slovenski standard je istoveten z: EN ISO 787-25:2019
ICS:
87.060.10 Pigmenti in polnila Pigments and extenders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 787-25
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 87.060.10 Supersedes EN ISO 787-25:2006
English Version
General methods of test for pigments and extenders - Part
25: Comparison of the colour, in full-shade systems, of
white, black and coloured pigments - Colorimetric method
(ISO 787-25:2019)
Méthodes générales d'essai des pigments et matières Allgemeine Prüfverfahren für Pigmente und Füllstoffe -
de charge - Partie 25: Comparaison, dans les systèmes Vergleich der Farbe von Weiß-, Schwarz- und
monopigmentaires, de la couleur des pigments blancs, Buntpigmenten in Purton-Systemen - Teil 25:
noirs et colorés - Méthode colorimétrique (ISO 787- Farbmetrisches Verfahren (ISO 787-25:2019)
25:2019)
This European Standard was approved by CEN on 15 February 2019.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 787-25:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 787-25:2019) has been prepared by Technical Committee ISO/TC 256
"Pigments, dyestuffs and extenders" in collaboration with Technical Committee CEN/TC 298 “Pigments
and extenders” 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 September 2019, and conflicting national standards
shall be withdrawn at the latest by September 2019.
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 787-25:2006.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 787-25:2019 has been approved by CEN as EN ISO 787-25:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 787-25
Second edition
2019-02
General methods of test for pigments
and extenders —
Part 25:
Comparison of the colour, in full-shade
systems, of white, black and coloured
pigments — Colorimetric method
Méthodes générales d'essai des pigments et matières de charge —
Partie 25: Comparaison, dans les systèmes monopigmentaires,
de la couleur des pigments blancs, noirs et colorés — Méthode
colorimétrique
Reference number
ISO 787-25:2019(E)
©
ISO 2019
ISO 787-25:2019(E)
© ISO 2019
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 787-25:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Materials . 2
5.1 Alkyd resin (binder) . 2
5.2 Fumed silica . 2
5.3 Preparation of the test medium . 3
6 Apparatus . 3
7 Sampling . 5
8 Procedure. 5
8.1 General . 5
8.2 Test portion . 5
8.2.1 Generals . 5
8.2.2 White pigments . 5
8.2.3 Coloured and black pigments . 5
8.3 Preparation of pigment dispersions . 5
8.4 Preparation of test specimens . 6
8.4.1 General. 6
8.4.2 White pigments . 6
8.4.3 Coloured and black pigments . 6
8.5 Measurement . 6
9 Expression of results . 7
9.1 White pigments and black pigments . 7
9.1.1 Relative hue . 7
9.1.2 Amount of relative hue . 8
9.2 Lightness difference . 8
9.3 Coloured pigments. 8
10 Test report . 8
Bibliography . 9
ISO 787-25:2019(E)
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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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 256, Pigments, dyestuffs and extenders.
This second edition cancels and replaces the first edition (ISO 787-25:1993), which has been technically
revised. The main changes compared to the previous edition are as follows:
— Clause 3 has been revised and terms and definitions for full shade, mass tone and mass tone system
have been added/revised;
— the normative references have been updated;
— the text has been editorially revised.
A list of all parts in the ISO 787 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 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 787-25:2019(E)
General methods of test for pigments and extenders —
Part 25:
Comparison of the colour, in full-shade systems, of white,
black and coloured pigments — Colorimetric method
1 Scope
This document specifies a general test method for comparing the colour, in full-shade systems, of white,
black or coloured pigments with that of an agreed reference pigment, using a colorimetric procedure.
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 787-9, General methods of test for pigments and extenders — Part 9: Determination of pH value of an
aqueous suspension
ISO 787-24, General methods of test for pigments and extenders — Part 24: Determination of relative tinting
strength of coloured pigments and relative scattering power of white pigments — Photometric methods
ISO 2114, Plastics (po
...