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#Paint drawdown series

Available as a wire wrapped bar or a machined bar. Paint and coating testing manual : fourteenth edition of the Gardner-Sward handbook (14th ed.). Drawdown Bars and Rods Drawdown bars and rods for ink testing. Ciullo, Industrial Minerals and Their Uses: A Handbook and Formulary, pp. Barkman, "Reading the Hegman Grind Gauge" Paint, Oil and Chemical Review June 22, 113 1950 pp 34-39,

^ Eric Kissa, Dispersions: Characterization, Testing, and Measurement, p.

^ "ASTM D1316 - 20 Standard Test Method for Fineness of Grind of Printing Inks by the NPIRI Grindometer".

McKay, Technological Applications of Dispersions, p.

^ "ASTM D1210 - 05(2014) Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage".

The paint is left to dry, and the CR is then determined. The thickness of this film is directly related and normally assumed to be equal to the gap depth of the drawdown bar used.

^ Koeler, Paint and Coating Testing Manual, p. Moving the drawdown bar at a constant velocity causes the paint to be spread over the card, in a thick film.

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. In all of these fields, grind gauges are utilized to produce, store, and apply dispersion products.

Grind gauges are used in a variety of fields, including food, pharmaceutical, plastic and many others. The Hegman gauge is widely used for this purpose because it requires minimal skill and only a few seconds' work. Like the Hegman scale, this is also inverted compared to the value in microns:ĭetermining the fineness of a paint's grind is important, because too coarse a grind may reduce the paint's color uniformity, gloss, and opacity. Ī lesser-used scale, North (or PCU), is also occasionally employed in the paint industry. 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 and used to determine particle size. The grooves decrease in depth from one end of the block to the other, according to a scale stamped next to them. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.

#Paint drawdown series

The Hegman gauge usually consists of a stainless steel block with a series of very small parallel grooves machined into it. paint drawdown drawdown Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. The resulting properties of the dispersion vary based on the size of individual particles and the degree which they are dispersed. This is important because many types of solid materials must be ground into finer particles in order to be dispersed in liquids. 0 Use a different mil thickness accordingly.

It is commonly used to determine how finely ground the particles of pigment (or other solid) dispersed in a sample of paint (or other liquid) are. 0 Stick the paint film thickness gauge into the wet paint and read the paint thickness. A Hegman gauge, sometimes referred to as a grind gauge, grind gage, or grindometer, is an instrument which indicates the fineness of grind or the presence of coarse particles and agglomeration in a dispersion.