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DIN Standards Committee Coatings and Coating Materials

Abstract

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.

Begin

2024-05-28

WI

00139819

Planned document number

DIN EN ISO 20659-2

Project number

00201229

Responsible national committee

NA 002-00-07-16 AK - Rheology  

Responsible european committee

CEN/TC 139 - Paints and varnishes  

Responsible international committee

ISO/TC 35/SC 9/WG 30 - Properties prior to and during application and drying  

previous edition(s)

Rheological test methods - Part 2: Thixotropy - Determination of the time-dependent structural change - Fundamentals and interlaboratory test; Text in German and English
2022-07