BYK-Gardner Various Grindometer Grind Gauge

Product Description
Fineness of Grind Gages (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 paint, plastic, pigment, printing ink, paper, ceramic, pharmaceutical, food, and many other industries.
The Fineness of Grind Gage is a flat steel block in the surface of which are two flat-bottomed grooves varying uniformly in depth from a maximum at one end of the block to zero near the other end. Groove depth is graduated on the block according to one or more scales used for measuring particle size.

When solid materials are milled in a liquid media to reduce the particle size a grindometer is used to check the particle size. In the coating and ink industries the grindometer is also called a Hegman gage. Pigment particles are in an agglomerated state. The agglomerates are milled to produce smaller aggregates or the primary particles. The Hegman grind is a fast simple test to determine the presence of coarse particles and their approximate size. A determination can be made to continue the milling process. Grindometers come in different sizes, scale units, and scale ranges. The BYK-Gardner has Hegman gages to comply with ISO and ASTM method requirements.

Procedure:
Place a slight excess of sample in the deep end of the groove, and with the straight-edge scraper provided, draw the sample toward the shallow end of the groove. Ratings are in terms of the point on the scale where the oversize particles, or furrows made by them, first appear in substantial concentration.

Most gages will have one scale marked in either mils or microns.
1 mil = 25.4 microns
1 mil = 0.001 inch
1 micron, ìm = 0.001 mm or 10-6 m

The Hegman scale or National Standard scale may be abbreviated 'NS' on the gage. The scale ranges from 0 to 8 with numbers increasing as the particle size decreases.
0 Hegman = 4 mil/100 micron particle size
4 Hegman = 2 mil/50 micron particle size
8 Hegman = 0 mil/0 micron particle size

BYK-Gardner offers a wide variety of grind gages varying in scales, number of grooves, length and width of grooves and size of the block.
Comes in a reusable storage box to prevent damage.

SEE ATTACGED PDF FOR A CHART OF THE VARIOUS GAUGES AVAILABLE
The following link provides additional information from the manufacturer's brochure. Click to open the PDF in a new window or right-click to download it:
BYK-Gardner Various Grindometer Grind Gauge or copy the following into your browser address window: labequip.com/stock/pictures/n1459.pdf
Made in USA.

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