What is hegmans?

Hegman's is a grading scale that measures the fineness of particle size in paints, coatings, and inks. It is commonly used by manufacturers in the paint industry to measure the effectiveness of milling and to ensure that the paint is smooth and easy to apply. The scale has a range of 0 to 8 and is based on the diameter of the smallest opening through which the particles can pass. The lower the Hegman number, the coarser the particle size, and the higher the number, the finer the particle size. A Hegman number of 4 to 6 is typical for most paints and coatings. The Hegman scale is named after its inventor, Warren Hegman, who developed it in the 1930s.