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Hegman gauge
A Hegman gauge, sometimes referred to as a grind gauge or grindometer, is a device used to determine how finely ground the particles of pigment (or other solid) dispersed in a sample of paint (or other liquid) are. The gauge consists of a 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 channel of grooves running lengthwise, 12.5mm across and narrowing uniformly in depth from 100 μm to zero.〔Robert B. McKay, (Technological Applications of Dispersions ), p. 43 (citing ASTM D1210-79 (1988)). Marcel Dekker, Inc., 1994.〕
A Hegman gauge is used by puddling a sample of paint at the deep end of the gauge and drawing the paint down with a flat edge along the grooves. The paint fills the grooves, and the location where a regular, significant "pepperyness" in the appearance of the coating appears, marks the coarsest-ground dispersed particles.〔 The reading is taken from the scale marked next to the grooves, in dimensionless "Hegman units" and/or mils or micrometres.〔Eric Kissa, (Dispersions: Characterization, Testing, and Measurement ), p. 243. Marcel Dekker, Inc., 1999.〕 Hegman units are defined in terms of an inverted size scale as shown below:〔D. Doubleday and A. Barkman, "Reading the Hegman Grind Gauge" Paint, Oil and Chemical Review June 22, 113 1950 pp 34-39, http://www.gardco.com/pages/dispersion/fg/Hegman%20Article.pdf〕
Determining the fineness of a paint's grind is important, because too coarse a grind may reduce the paint's color uniformity, gloss, and opacity.〔Peter A. Ciullo, (Industrial Minerals and Their Uses: A Handbook and Formulary ), pp. 155–56. Noyes Publication 1996.〕 The Hegman gauge is widely used for this purpose because it requires minimal skill and only a few seconds' work.〔
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.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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