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 Grain Size and Pigment Dispersion

Grain Size and Pigment Dispersion

For producing good quality coating materials containing pigments or other powder substances these substances must be sufficiently well prepared to result in a smooth film without grain size blemishes.

The Grindometer acc. to Hegman, Model 232, was developed to establish the fineness of grind of coating materials. The instrument is used to produce a liquid wedge-shaped specimen of the test substance. It can be easily ascertained by visual examination where the grain size is larger than the local dimensions of the wedge channel. A reading of the appropriate channel depth is taken at the boundary between the uneven and the smooth surface areas of the sample. This value determines the fineness of grind.



Grain Size and Pigment Dispersion

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