Many solid materials must be ground into fine particles for dispersion in liquid vehicles. The fineness of these dispersions (“grinds”) depends on both particle size and degree of dispersion.
Fineness of grind gauges indicate the fineness of grind or the presence of coarse particles or agglomerates in a dispersion; they do not determine exact particle size or distribution.
A fineness gauge is a hardened stainless steel block with one or two flat-bottomed grooves that decrease uniformly in depth from a maximum to zero, graduated in microns and Hegman units.
Our gauges and scrapers are made of hardened stainless steel, with one or two grooves depending on the model, and a tolerance of ±2 µm (flatness < 3 µm). They conform to ISO 1524, ASTM D1210, ASTM D1316 and DIN EN 21524, and are supplied with a calibration certificate.
Standards
ISO 1524
ASTM D 1210
ASTM D 1316
DIN EN 21524
Technical Specification
The degree of dispersion is indicated in microns (µm) or Hegman (H); the Hegman scale ranges from 0 to 8, with higher values corresponding to smaller particle sizes (e.g. 0 Hegman ≈ 100 µm, 4 Hegman ≈ 50 µm, 8 Hegman ≈ 0 µm).
