ISO/TR 20659-1:2024
(Main)Rheological test methods — Fundamentals and interlaboratory comparisons — Part 1: Determination of the yield point
Rheological test methods — Fundamentals and interlaboratory comparisons — Part 1: Determination of the yield point
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.
Méthodes d'essai rhéologiques — Principes fondamentaux et comparaisons interlaboratoires — Partie 1: Détermination du seuil d'écoulement
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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
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ISO/TR 20659-1:2024(en) © ISO 2024
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ISO/TR 20659-1:2024(en)
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ii
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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 .
...
FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 20659-1
ISO/TC 35/SC 9
Rheological test methods —
Secretariat: BSI
Fundamentals and interlaboratory
Voting begins on:
2023-11-17 comparisons —
Voting terminates on:
Part 1:
2024-01-12
Determination of the yield point
RECIPIENTS OF THIS DRAFT ARE INVITED TO
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DTR 20659-1:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
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LIGHT OF THEIR POTENTIAL TO BECOME STAN-
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NATIONAL REGULATIONS. © ISO 2023
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ISO/DTR 20659-1:2023(E)
FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 20659-1
ISO/TC 35/SC 9
Rheological test methods —
Secretariat: BSI
Fundamentals and interlaboratory
Voting begins on:
comparisons —
Voting terminates on:
Part 1:
Determination of the yield point
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DTR 20659-1:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
© ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 2 ----------------------
ISO/DTR 20659-1:2023(E)
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
...
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ISO/TRDTR 20659-1:2023(E)
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ISO/TRDTR 20659-1:2023(E)
Formatted: Space Before: 48 pt, Don't adjust space
Contents
between Latin and Asian text, Don't adjust space
between Asian text and numbers
Foreword . 5
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Goal of the interlaboratory test . 2
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 . 3
5.4 Shear stress-controlled rotational test . 6
5.5 Evaluation methods for yield points .
...
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