GRIND GAUGE – FINENESS OF GRIND

A grind gauge is an instrument used to quickly evaluate the quality of a dispersion.

The grind gauge is an instrument that indicates the fineness of grind or the presence of coarse particles and agglomeration in a dispersion. It is commonly used to determine how finely ground the particles of pigment are dispersed in a sample of paint.

The grind gauge consists of a steel block with one or more machined grooves. The depth of the grooves varies steadily between a minimum and maximum value. A sample is placed on the grind gage and a machined scraper is drawn at a constant rate beginning at the deeper end of the groove. The gauge is then viewed at a 20-30 degree angle. Scratches will form in the wet coating in the grooves. The point where the scratches begin indicates the grind. A scale aside from the groove corresponding to the particle size indicates the grind reading.

HEGMAN & NS
(NORTH OR NAT'L STD.)
MILS MICRONS
0 4 102
1 3.5 89
2 3 76
3 2.5 64
4 2 51
5 1.5 38
6 1 25
7 0.5 13
8 0 0