SIST EN ISO 787-14:2019

General methods of test for pigments and extenders - Part 14: Determination of resistivity of aqueous extract (ISO 787-14:2019)

This document specifies a general method of test for determining the electric resistivity (specific electric resistance) or the specific electric conductivity, respectively, of the aqueous extract of a pigment. The method is applicable to all pigments and extenders, except pigments that are soluble in water.
The resistivity of the aqueous extract of a pigment is considered as a property independent of the amount of water-soluble matter. If agreed, a cold extraction method can be used.

Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Teil 14: Bestimmung des spezifischen Widerstandes des wässrigen Extraktes (ISO 787-14:2019)

Méthodes générales d'essai des pigments et matières de charge - Partie 14: Détermination de la résistivité de l'extrait aqueux (ISO 787-14:2019)

Le présent document spécifie une méthode générale d'essai pour déterminer la résistivité électrique (résistance électrique spécifique) ou la conductivité électrique spécifique de l'extrait aqueux d'un pigment. La méthode est applicable à tous les pigments et matières de charge, à l'exception des pigments solubles dans l'eau.
La résistivité de l'extrait aqueux d'un pigment est considérée comme une propriété indépendante de la quantité de matières solubles dans l'eau. Si un accord a été conclu en ce sens, une méthode par extraction à froid peut être utilisée.

Splošne metode preskušanja pigmentov in polnil - 14. del: Določevanje specifične upornosti vodnega ekstrakta (ISO 787-14:2019)

Ta dokument določa splošno metodo preskušanja za določevanje električne upornosti (specifične električne upornosti) oziroma specifične električne prevodnosti vodnega ekstrakta pigmenta. Metoda se uporablja za vse pigmente in polnila, ki so topni v vodi.
Upornost vidnega ekstrakta pigmenta se obravnava kot lastnost, neodvisna od količine v vodi topne snovi. V primeru dogovora se lahko uporablja metoda hladne ekstrakcije.

General Information

• Status: Published
• Public Enquiry End Date: 24-Apr-2018
• Publication Date: 14-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: 11-Apr-2019
• Due Date: 16-Jun-2019
• Completion Date: 15-Apr-2019
• Ref Project: EN ISO 787-14:2019 - General methods of test for pigments and extenders - Part 14: Determination of resistivity of aqueous extract (ISO 787-14:2019)

Relations

• Replaces: SIST EN ISO 787-14:2003 - General methods of test for pigments and extenders - Part 14: Determination of resistivity of aqueous extract (ISO 787-14:2002)
• Effective Date: 01-May-2019

Overview

EN ISO 787-14:2019 specifies a standardized method to determine the electric resistivity (or the reciprocal, specific electric conductivity) of the aqueous extract of pigments and extenders. The procedure applies to all pigments and extenders except those that are soluble in water. The method treats resistivity as an intrinsic property of the aqueous extract and allows an agreed cold extraction variant when appropriate.

This part of the ISO 787 series is intended to support consistent measurement practice across laboratories and to enable reproducible quality assessment of pigment raw materials.

Key Topics

• Scope and applicability: Measurement of resistivity/conductivity of aqueous extracts for pigments and extenders; excludes water‑soluble pigments.
• Reagents and apparatus: High‑purity water and ethanol (ethanol replaces methanol as wetting agent), conductivity calibration solution (e.g. KCl), conductivity meter with temperature compensation, conductivity cell (cell constant K ≈ 1), cylinder, filtration or centrifugation equipment.
• Preparation and extraction:
  • Adjust pigment suspension concentration to 5 %–10 % (mass fraction).
  • Wet poorly wettable pigments with ethanol to form a soft paste before adding water.
  • Extraction options: heated extraction (100 °C for 5 min or 60 °C for at least 30 min) with continuous stirring, or an agreed cold extraction at room temperature (must be reported with duration).
  • Maintain pigment concentration during warm extraction by compensating for water loss.
• Measurement:
  • Filter or centrifuge to obtain the aqueous filtrate.
  • Place conductivity cell in filtrate with vent ~10 mm below liquid surface.
  • Preferred measurement temperature is 23 °C (report other temperatures and apply corrections).
  • Use blank correction if the water/filter blank conductivity exceeds specified limits; resistivity = 1 / conductivity.
• Reporting: Results in ohm‑metres (Ω·m) or µS/cm; include product identification, reference to ISO 787-14:2019, ethanol wetting status, test result, any deviations, and test date.

Applications

• Quality control (QC) of pigments and extenders during production and incoming inspection.
• Raw material acceptance and batch comparison to detect changes in ionic content or contamination.
• Formulation compatibility checks to assess potential interactions due to water‑soluble impurities.
• Troubleshooting conductivity‑related issues in paints, coatings and other pigment‑based systems.

Related Standards

• ISO 15528 - Sampling of paints, varnishes and raw materials (referenced for representative sampling).
• ISO 18451-1 - Terminology for pigments, dyestuffs and extenders (definitions used in this document).
• Other parts of the ISO 787 series cover complementary general test methods for pigments and extenders.

For laboratory implementation, follow the apparatus calibration and temperature compensation requirements described in the standard and report any agreed deviations (e.g., use of cold extraction) in the test report.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2019
1DGRPHãþD
SIST EN ISO 787-14:2003
6SORãQHPHWRGHSUHVNXãDQMDSLJPHQWRYLQSROQLOGHO'RORþHYDQMHVSHFLILþQH
XSRUQRVWLYRGQHJDHNVWUDNWD,62
General methods of test for pigments and extenders - Part 14: Determination of
resistivity of aqueous extract (ISO 787-14:2019)
Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Teil 14: Bestimmung des
spezifischen Widerstandes des wässrigen Extraktes (ISO 787-14:2019)
Méthodes générales d'essai des pigments et matières de charge - Partie 14:
Détermination de la résistivité de l'extrait aqueux (ISO 787-14:2019)
Ta slovenski standard je istoveten z: EN ISO 787-14:2019
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 787-14
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 87.060.10 Supersedes EN ISO 787-14:2002
English Version
General methods of test for pigments and extenders - Part
14: Determination of resistivity of aqueous extract (ISO
787-14:2019)
Méthodes générales d'essai des pigments et matières Allgemeine Prüfverfahren für Pigmente und Füllstoffe -
de charge - Partie 14: Détermination de la résistivité de Teil 14: Bestimmung des spezifischen Widerstandes
l'extrait aqueux (ISO 787-14:2019) des wässrigen Extraktes (ISO 787-14:2019)
This European Standard was approved by CEN on 1 March 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 787-14:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 787-14:2019) 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 787-14:2002.
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 787-14:2019 has been approved by CEN as EN ISO 787-14:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 787-14
Third edition
2019-03
General methods of test for pigments
and extenders —
Part 14:
Determination of resistivity of
aqueous extract
Méthodes générales d'essai des pigments et matières de charge —
Partie 14: Détermination de la résistivité de l'extrait aqueux
Reference number
ISO 787-14:2019(E)
©
ISO 2019
ISO 787-14:2019(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.
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ii © ISO 2019 – All rights reserved

ISO 787-14:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reagents . 1
5 Apparatus . 1
6 Sampling . 2
7 Preparation of the conductivity meter . 2
8 Procedure. 2
9 Expression of results . 3
10 Test report . 3
ISO 787-14:2019(E)
Fore
...