ISO/TR 20659-2:2024
(Main)Rheological test methods — Fundamentals and interlaboratory comparisons — Part 2: Determination of the time-dependent structural change (thixotropy)
Rheological test methods — Fundamentals and interlaboratory comparisons — Part 2: Determination of the time-dependent structural change (thixotropy)
This document gives information on an interlaboratory comparison for the determination of the time-dependent structural change (thixotropy) using rheological test methods. Thixotropy is the reversible, time-dependent decrease of shear viscosity η at a constant shear rate γ or shear stress τ. This document provides examples of fields of application, in which important material properties can be characterized by the thixotropy. These fields of application include: — effectiveness of rheological additives and thixotropic agents, respectively; — stability of the structure at rest (e.g. behaviour when starting to pump); — wet film thickness after processing; — 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 2: Détermination de la variation structurelle dans le temps (thixotropie)
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ISO/TR 20659-2
First edition
Rheological test methods —
2024-03
Fundamentals and interlaboratory
comparisons —
Part 2:
Determination of the time-
dependent structural change
(thixotropy)
Méthodes d'essai rhéologiques — Principes fondamentaux et
comparaisons interlaboratoires —
Partie 2: Détermination de la variation structurelle dans le temps
(thixotropie)
Reference number
ISO/TR 20659-2:2024(en) © ISO 2024
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ISO/TR 20659-2:2024(en)
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© ISO 2024
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be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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ii
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ISO/TR 20659-2:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring technique for the determination of thixotropy . 1
4.1 Conditions for the measuring technique .1
4.2 Flow curves, with evaluation of the hysteresis area (rotational test) .3
4.2.1 Specification of the measuring profile .3
4.2.2 Evaluation .5
4.3 Step test with recovery, as a rotational test with controlled shear rate .7
4.3.1 Specification of the measuring programme .7
4.3.2 Evaluation .8
4.4 Step test with recovery, as a rotational test with alternating controlled shear stress
and shear rate .9
4.4.1 Specification of the measuring programme .9
4.4.2 Evaluation .10
4.5 Step test with recovery, as a combined oscillatory and rotational test with controlled
shear strain and shear rate, respectively .10
4.5.1 Specification of the measuring programme .10
4.5.2 Evaluation . .11
5 Comparative testing programme .
...
FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 20659-2
ISO/TC 35/SC 9
Rheological test methods —
Secretariat: BSI
Fundamentals and interlaboratory
Voting begins on:
2023-11-17 comparisons —
Voting terminates on:
Part 2:
2024-01-12
Determination of the time-dependent
structural change (thixotropy)
RECIPIENTS OF THIS DRAFT ARE INVITED TO
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DTR 20659-2:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
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OCCASION HAVE TO BE CONSIDERED IN THE
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NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 1 ----------------------
ISO/DTR 20659-2:2023(E)
FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 20659-2
ISO/TC 35/SC 9
Rheological test methods —
Secretariat: BSI
Fundamentals and interlaboratory
Voting begins on:
comparisons —
Voting terminates on:
Part 2:
Determination of the time-dependent
structural change (thixotropy)
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 20659-2:2023(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 20659-2:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring technique for the determination of thixotropy . 1
4.1 Conditions for the measuring technique . 1
4.2 Flow curves, with evaluation of the hysteresis area (rotational test) . 3
4.2.1 Specification of the measuring profile . 3
4 .2 .2 E v alu at ion . 5
4.3 Step test with recovery, as a rotational test with controlled shear rate . 7
4.3.1 Specification of the measuring programme . 7
4 . 3 . 2 E v a lu at ion . 8
4.4 Step test with recovery, as a rotational test with alternating controlled shear
stress and shear rate . 9
4.4.1 Specification of the measuring
...
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ISO/TR 20659-2:2023(E)
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ISO/TR 20659-2:2023(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 . v
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Measuring technique for the determination of thixotropy . 7
4.1 Conditions for the measuring technique . 7
4.2 Flow curves, with evaluation of the hysteresis area (rotational test) . 9
4.2.1 Specification of the measuring profile: . 9
4.2.2 Evaluation: . 11
4.3 Step test with recovery, as a rotational test with controlled shear rate. 13
4.3.1 Specification of the measuring programme: . 13
4.3.2 Evaluation: . 14
4.4 Step test with recovery, as a rotational test with alternating contro
...
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