SIST-TP CEN ISO/TR 20659-1:2025
(Main)Rheological test methods - Fundamentals and interlaboratory comparisons - Part 1: Determination of the yield point (ISO/TR 20659-1:2024)
Rheological test methods - Fundamentals and interlaboratory comparisons - Part 1: Determination of the yield point (ISO/TR 20659-1:2024)
This document gives information on an interlaboratory comparison for the determination of the yield point, using rheological test methods. The yield point is the shear stress τ below which a material does not flow.
This document provides examples of fields of applications, in which important material properties are characterized with the aid of the yield point. These fields of application include:
— effectiveness of rheological additives;
— shelf life (e.g. with regard to sedimentation, separation and flocculation);
— stability of the structure at rest;
— behaviour when starting to pump;
— use in scraper systems;
— wet-film thickness;
— levelling and sagging behaviour (e.g. without brushmarks or sag formation);
— orientation of effect pigments.
Rheologische Prüfverfahren - Grundlagen und Ringversuch - Teil 1: Bestimmung der Fließgrenze (ISO/TR 20659-1:2024)
Méthodes d'essai rhéologiques - Principes fondamentaux et comparaisons interlaboratoires - Partie 1: Détermination du seuil d'écoulement (ISO/TR 20659-1:2024)
Reološke preskusne metode - Osnovni principi in medlaboratorijske primerjave - 1. del: Določanje meje plastičnosti (ISO/TR 20659-1:2024)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2025
Reološke preskusne metode - Osnovni principi in medlaboratorijske primerjave -
1. del: Določanje meje plastičnosti (ISO/TR 20659-1:2024)
Rheological test methods - Fundamentals and interlaboratory comparisons - Part 1:
Determination of the yield point (ISO/TR 20659-1:2024)
Rheologische Prüfverfahren - Grundlagen und Ringversuch - Teil 1: Bestimmung der
Fließgrenze (ISO/TR 20659-1:2024)
Méthodes d'essai rhéologiques - Principes fondamentaux et comparaisons
interlaboratoires - Partie 1: Détermination du seuil d'écoulement (ISO/TR 20659-1:2024)
Ta slovenski standard je istoveten z: CEN ISO/TR 20659-1:2024
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN ISO/TR 20659-1
TECHNICAL REPORT
RAPPORT TECHNIQUE
October 2024
TECHNISCHER REPORT
ICS 87.040
English Version
Rheological test methods - Fundamentals and
interlaboratory comparisons - Part 1: Determination of the
yield point (ISO/TR 20659-1:2024)
Méthodes d'essai rhéologiques - Principes Rheologische Prüfverfahren - Grundlagen und
fondamentaux et comparaisons interlaboratoires - Ringversuch - Teil 1: Bestimmung der Fließgrenze
Partie 1: Détermination du seuil d'écoulement (ISO/TR (ISO/TR 20659-1:2024)
20659-1:2024)
This Technical Report was approved by CEN on 6 October 2024. It has been drawn up by the Technical Committee CEN/TC 139.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TR 20659-1:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (CEN ISO/TR 20659-1:2024) has been prepared by Technical Committee ISO/TC 35
"Paints and varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes”
the secretariat of which is held by DIN.
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.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
Endorsement notice
The text of ISO/TR 20659-1:2024 has been approved by CEN as CEN ISO/TR 20659-1:2024 without any
modification.
Technical
Report
ISO/TR 20659-1
First edition
Rheological test methods —
2024-03
Fundamentals and interlaboratory
comparisons —
Part 1:
Determination of the yield point
Méthodes d'essai rhéologiques — Principes fondamentaux et
comparaisons interlaboratoires —
Partie 1: Détermination du seuil d'écoulement
Reference number
ISO/TR 20659-1:2024(en) © ISO 2024
ISO/TR 20659-1:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO/TR 20659-1:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Goal of the interlaboratory test . 1
5 Metrological determination of the yield point . 2
5.1 General .2
5.2 Shear rate-controlled rotational test .2
5.3 Yield point evaluation using flow curve regression models .2
5.4 Shear stress-controlled rotational test .4
5.5 E valuation methods for yield points .4
5.5.1 General .4
5.5.2 Axis intercept for presentation of the flow curve using a linear scale .4
5.5.3 Plateau value for presentation of the flow curve using a logarithmic scale .5
5.5.4 Yield point evaluation at a reference value .5
5.5.5 Methods with regression lines for presentation in the lg γ/lg τ diagram .6
5.5.6 Rotational test: viscosity maximum method .7
5.5.7 Tests with constant shear rate .8
5.5.8 Creep test .9
5.5.9 Oscillatory test: amplitude sweep .10
6 Results of the comparative testing programme .12
6.1 Performance of the tests . 12
6.1.1 Preliminary tests . 12
6.1.2 Comparative testing programme . 12
6.2 Measuring samples . 12
6.3 Method used for determination of the yield point . 13
7 Result. 14
8 Rheometer calibration and measurement uncertainty .15
Annex A (informative) Explanatory notes .16
Bibliography . 17
iii
ISO/TR 20659-1:2024(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/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
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 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
A list of all parts in the ISO 20659 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
Technical Report ISO/TR 20659-1:2024(en)
Rheological test methods — Fundamentals and
interlaboratory comparisons —
Part 1:
Determination of the yield point
1 Scope
This document gives information on an interlaboratory comparison for the determination of the yield point,
using rheological test methods. The yield point is the shear stress τ below which a material does not flow.
This document provides examples of fields of applications, in which important material properties are
characterized with the aid of the yield point. These fields of application include:
— effectiveness of rheological additives;
— shelf life (e.g. with regard to sedimentation, separation and flocculation);
— stability of the structure at rest;
— behaviour when starting to pump;
— use in scraper systems;
— wet-film thickness;
— levelling and sagging behaviour (e.g. without brushmarks or sag formation);
— orientation of effect pigments.
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 3219-1, Rheology — Part 1: Vocabulary and symbols for rotational and oscillatory rheometry
3 Terms and defi
...
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