ISO/TR 20659-2:2024

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

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ISO/TR 20659-2:2024

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

PUBLISH DATE 2024
ISO/TR 20659-2:2024

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 at a constant shear rate or shear stress.

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.
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