60.60 Standard published Oct 9, 2024
CEN
CEN/TC 139 Paints and varnishes
Technical Report
87.040 Paints and varnishes
Draft
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 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.
PUBLISHED
CEN ISO/TR 20659-2:2024
60.60
Standard published
Oct 9, 2024
