prEN ISO 20427

SLOVENSKI STANDARD
01-junij-2025
Pigmenti in polnila - Postopek disperzije za določanje porazdelitve velikosti delcev
na podlagi sedimentacije suspendiranih pigmentov ali polnil v tekoči fazi (ISO/DIS
20427:2025)
Pigments and extenders - Dispersion procedure for sedimentation-based particle sizing
of suspended pigment or extender with liquid sedimentation methods (ISO/DIS
20427:2025)
Pigmente und Füllstoffe - Dispergierverfahren zur sedimentativen
Teilchengrößenbestimmung von suspendierten Pigmenten oder Füllstoffen mit
Flüssigsedimentationsverfahren (ISO/DIS 20427:2025)
Pigments et matières de charge - Mode opératoire de dispersion pour la détermination
granulométrique basée sur la sédimentation des pigments ou matières de charge en
suspension par des méthodes de sédimentation dans un liquide (ISO/DIS 20427:2025)
Ta slovenski standard je istoveten z: prEN ISO 20427
ICS:
87.060.10 Pigmenti in polnila Pigments and extenders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 20427
ISO/TC 256
Pigments and extenders —
Secretariat: DIN
Dispersion procedure for
Voting begins on:
sedimentation-based particle sizing
2025-05-06
of suspended pigment or extender
Voting terminates on:
with liquid sedimentation methods
2025-07-29
Pigments et matières de charge — Mode opératoire de
dispersion pour la détermination granulométrique basée sur la
sédimentation des pigments ou matières de charge en suspension
par des méthodes de sédimentation dans un liquide
ICS: 87.060.10
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.
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RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 20427:2025(en)
DRAFT
ISO/DIS 20427:2025(en)
International
Standard
ISO/DIS 20427
ISO/TC 256
Pigments and extenders —
Secretariat: DIN
Dispersion procedure for
Voting begins on:
sedimentation-based particle sizing
of suspended pigment or extender
Voting terminates on:
with liquid sedimentation methods
Pigments et matières de charge — Mode opératoire de
dispersion pour la détermination granulométrique basée sur la
sédimentation des pigments ou matières de charge en suspension
par des méthodes de sédimentation dans un liquide
ICS: 87.060.10
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.
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TO SUBMIT, WITH THEIR COMMENTS,
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 20427:2025(en)
ii
ISO/DIS 20427:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principles of dispersion. 3
4.1 Principles of ultrasonic dispersion .3
4.2 Principle of wet jet mill dispersion . .3
4.3 Principle of shaker-based dispersion .3
5 Principles of sedimentation-based techniques for particle size analysis . 4
5.1 Stokesian sedimentation analysis .4
5.2 Disc-type centrifuges .4
5.3 Cuvette-type centrifuges . .4
5.4 Gravitation-based sedimentation methods .4
5.5 Centrifugal field-flow fractionation method .5
6 Apparatus . 5
6.1 Apparatus for ultrasonic dispersion .5
6.2 Apparatus for wet jet milling dispersion .5
7 Settings for dispersion . 7
7.1 Procedure of ultrasonic dispersion using a probe-type sonicator .7
7.2 Procedure of ultrasonic dispersion using a bath-type sonicator .8
7.3 Procedure of shaker-based dispersion .8
8 Dispersion procedure . 9
8.1 General .9
8.2 Sampling for dispersion.9
8.3 Reagents .9
8.4 Recommendations for sample preparation.10
9 Sampling . 10
10 Measurement and expression of results . 10
11 Test report . 10
Annex A (normative) Protocol for the determination of energy input .12
Annex B (informative) Limits for ultrasonic dispersion procedure .15
Annex C (informative) Procedures for dispersion of TiO pigments .16
Annex D (informative) Procedure for dispersion of CaCO with wet jet milling . 17
Annex E (informative) Procedure for the dispersion of Fe O with an ultrasonic probe .18
2 3
Annex F (informative) Procedure for dispersion of carbon black . 19
Annex G (informative) General procedure for dispersion of pigment or extender .20
Bibliography .23

iii
ISO/DIS 20427:2025(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
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The procedures used to develop this document and those intended for its further maintenance are described
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This document was prepared by Technical Committee ISO/TC 256, Pigments, dyestuffs and extenders.
This second edition cancels and replaces the first edition (ISO 20427:2023), which has been technically
revised.
The main changes are as follows:
— in Clause 3 a reference to the vocabulary standards series ISO 18451 has been added;
— in 5.4, paragraph 1, a reference to ISO 13317-5 has been added;
— 5.4, paragraph 2, has been re-written for better comprehensibility and a reference to ISO 13317-4 has
been added;
— in 5.5 a note has been added with additional information on the effective particle density;
— 6.2, the last list item of A.2.2 and the first list item of A.2.3 have been re-written for better comprehensibility;
— in 6.9, Table 1, row 2, co
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