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BS PD CEN ISO/TR 20659-2:2024
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BS PD CEN ISO/TR 20659-2:2024

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Rheological test methods. Fundamentals and interlaboratory comparisons - Determination of the time-dependent structural change (thixotropy) - Incorporating corrigendum October 2024

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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 or shear stress τ.

This document provides examples of fields of application, in which important material properties can becharacterized 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.

All current amendments available at time of purchase are included with the purchase of this document.

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