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significant "pepperyness" in the appearance of the coating appears, marks the coarsest-ground dispersed particles. This is the point where oversized particles start to appear in high density and determines the rating for that material. The reading is taken from the scale marked next to the grooves, in dimensionless "Hegman units" (or
56:
A Hegman gauge is used by placing a sample of paint at the deep end of the gauge and drawing the paint down with a flat edge along the grooves. Grind gages are sold with machined flat 'drawdown bars' specifically for this purpose. The paint fills the grooves, and the location where a regular,
43:
The Hegman gauge usually consists of a stainless steel block with a series of very small parallel grooves machined into it. The grooves decrease in depth from one end of the block to the other, according to a scale stamped next to them. A typical Hegman gauge is 170mm by 65mm by 15mm, with a
40:(or other liquid) are. This is important because many types of solid materials must be ground into finer particles in order to be dispersed in liquids. The resulting properties of the dispersion vary based on the size of individual particles and the degree which they are dispersed.
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Grind gauges are used in a variety of fields, including; food, pharmaceutical, plastic and many others. In all of these fields, grind gauges are utilized to produce, store, and apply dispersion products.
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Hegman gauges are commonly available in the following ranges: 0 to 100 micrometres, 0 to 50 micrometres, 0 to 25 micrometres, 0 to 15 micrometres, and 0 to 10 micrometres.
210:
A lesser-used scale, North (or PCU), is also occasionally employed in the paint industry. Like the Hegman scale, this is also inverted compared to the value in microns:
28:, or grindometer, is an instrument which indicates the fineness of grind or the presence of coarse particles and agglomeration in a
317:, and opacity. The Hegman gauge is widely used for this purpose because it requires minimal skill and only a few seconds' work.
44:
channel of grooves running lengthwise, 12.5mm across and narrowing uniformly in depth from 100 Ξm to zero and used to determine
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Determining the fineness of a paint's grind is important, because too coarse a grind may reduce the paint's color uniformity,
430:
489:"ASTM D1210 - 05(2014) Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage"
368:"ASTM D1210 - 05(2014) Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage"
470:
355:
512:
442:
413:
386:
517:
314:
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D. Doubleday and A. Barkman, "Reading the Hegman Grind Gauge" Paint, Oil and
Chemical Review June 22,
400:"ASTM D1316 - 20 Standard Test Method for Fineness of Grind of Printing Inks by the NPIRI Grindometer"
29:
80:
8:
463:
Paint and coating testing manual : fourteenth edition of the
Gardner-Sward handbook
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69:. Hegman units are defined in terms of an inverted size scale as shown below:
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32:. It is commonly used to determine how finely ground the particles of
389:, p. 43 (citing ASTM D1210-79 (1988)). Marcel Dekker, Inc., 1994.
33:
431:
http://www.gardco.com/pages/dispersion/fg/Hegman%20Article.pdf
37:
443:
Industrial
Minerals and Their Uses: A Handbook and Formulary
414:
Dispersions: Characterization, Testing, and
Measurement
350:Koeler, Paint and Coating Testing Manual, p. 743,
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36:(or other solid) dispersed in a sample of
387:Technological Applications of Dispersions
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445:, pp. 155â56. Noyes Publication 1996.
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76:Hegman Grind Gage and doctor blade
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84:Paint sample at top of Hegman
20:, sometimes referred to as a
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92:Hegman after paint drawdown
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513:Dimensional instruments
465:(14th ed.). ASTM.
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518:Laboratory equipment
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61:units; NS) and/or
441:Peter A. Ciullo,
385:Robert B. McKay,
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59:National Standard
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52:Use with paint
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455:Bibliography
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412:Eric Kissa,
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219:North units
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99:Hegman Units
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42:
25:
21:
18:Hegman gauge
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67:micrometres
22:grind gauge
502:Categories
338:References
321:Other uses
30:dispersion
26:grind gage
461:Koleske.
105:Microns
216:Microns
34:pigment
508:Paints
469:
354:
116:101.6
330:Sizes
315:gloss
193:12.7
182:25.4
171:38.1
160:50.8
149:63.5
138:76.2
127:88.9
38:paint
467:ISBN
352:ISBN
304:100
227:100
102:Mils
63:mils
427:113
299:10
296:90
291:20
283:30
275:40
267:50
259:60
251:70
243:80
235:90
190:0.5
168:1.5
146:2.5
135:3.0
124:3.5
113:4.0
65:or
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288:80
280:70
272:60
264:50
256:40
248:30
240:20
232:10
204:0
48:.
24:,
16:A
491:.
475:.
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370:.
224:0
201:0
198:8
187:7
179:1
176:6
165:5
157:2
154:4
143:3
132:2
121:1
110:0
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