Fineness of grind gages are also called grind gages and Hegman gages. Many types of solid materials must be ground or milled into finer particles for dispersion in appropriate liquid vehicles. The physical properties of the resulting dispersions, often called “grinds”, depend not only on the actual size of the individual particles, but also on the degree to which they are dispersed.
The Fineness of Grind Gage is used to indicate the fineness of grind or the presence of coarse particles or agglomerates in a dispersion. It does not determine particle size or particle size distribution. Grind gages are used in controlling the production, storage, and application of dispersion products produced by milling in the paints, plastic, pigments, lacquers, filler, chocolate, printing ink, paper, ceramic, pharmaceutical, food, and many other industries.
Testing principle
The Grindometer 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.
The fineness plate is a flat steel block with grooves on the surface, and the depth of the grooves ranges from the maximum value at one end to the zero value at the other end. The steel block is engraved with a scale unit indicating the depth of the groove to read the size of the particle value.
Standards
ISO 1524
ASTM D333 D1316 D6846 D 1210, AS/NZS 1580.204.1, DIN 53203, EN 21524, FTMS 141 4411.1, JIS K 5600-2-5, NF T30-046
Some of standards have been superseded but are still recognised in some industries.
Material: Stainless steel
Surface treatment polished
Dimensions (LxWxH) and Weight
Groove width (mm): 12 mm
Number of grooves: 1
Grindometer base Dimensions: 165×37×13 mm
Scraper Dimensions: 70x40x6.5mm
The scale unit H is the Hegman scale:
0 Hegman=100 μm
4 Hegman=50 μm
8 Hegman=0 μm
1 mil = 25.4 μm
1 μm=0.001 mm=1 Micron
1 mil=0.001 inch
Packing List All models come with a base and a scraper.
Grindometer base
Scraper
Storage case