ISO/TR 20659-2:2024

Rheological test methods — Fundamentals and interlaboratory comparisons — Part 2: Determination of the time-dependent structural change (thixotropy)

ISO/TR 20659-2:2024

Name:ISO/TR 20659-2:2024   Standard name:Rheological test methods — Fundamentals and interlaboratory comparisons — Part 2: Determination of the time-dependent structural change (thixotropy)
Standard number:ISO/TR 20659-2:2024   language:English language
Release Date:11-Mar-2024   technical committee:ISO/TC 35/SC 9 - General test methods for paints and varnishes
Drafting committee:ISO/TC 35/SC 9 - General test methods for paints and varnishes   ICS number:87.040 - Paints and varnishes
Technical
Report
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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Published in Switzerland

© ISO 2024 – All rights reserved
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 .
...

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