METHODS OF TEST FOR PAINTS AND
VARNISHES : PART A7 : DETERMINATION OF
VISCOSITY AT A HIGH RATE OF SHEAR
(FIRST REVISION)
This Malaysian Standard specifies the general procedure for determining the dynamic
viscosity of paints, varnishes and related products at a rate of shear not less than
5000 s~’ and not higher than 20000 s1. When the viscosities of products are being
compared the rate of shear shall be approximately the same. The determination shall
be made at a closely controlled temperature, 27 ± 0.5°C.
The value obtained gives information about the resistance of the material to brushing
during the initial application period; no information is obtained, however, on the
changes resulting from evaporation of solvents from the paint.
The method is suitable for all brushing paints and varnishes whether they are
Newtonian in behaviour or not. Furthermore, because of the narrow gap between the
stationary and rotary parts of high shear viscometers, the method is more reproducible
for paints having low values for fineness of grain, as determined by MS 133:Pt.C6
