Standard Test Methods for Measurement of Yield Stress of Paints, Inks and Related Liquid Materials

Importancia y uso:

5.1 The yield stress of a material is a measure of the amount of force required to initiate movement of that material in a pipe, through a pump, or from nozzle. The yield stress also characterizes the ability of the material to maintain particles in suspension. Along with viscosity measurements, yield stress measurements have been useful in establishing root causes of flow problems such as excessive orange peel and sagging and in explaining resistance to such problems. After a coating has been applied, flow and leveling tends to be inversely related to yield stress and sag resistance tends to be directly related to yield stress. The ability of an automotive basecoat to keep aluminum and/or mica flakes oriented has been related to yield stress (direct relationship).

Subcomité:

D01.24

Volúmen:

06.01

Número ICS:

87.040 (Paints and varnishes), 87.080 (Inks. Printing inks)

Palabras clave:

coaxial cylinder geometry; cone/plate geometry; controlled stress rheometer; rotational speed; rotational viscometer; shear rate; shear stress; vane spindle geometry; yield stress;