A measure of the amount of coating added to a base stock of paper in the manufacturing of coated papers. The coat weight of a particular paper is determined by such factors as the desired basis weight and paper grade. As the basis weight is decreased, the coat weight must be decreased to provide uniformity and the desired degree of caliper, strength, opacity, and other desired properties. There are a variety of different methods utilized to apply coatings to paper. (See Coating.) Coat weight is usually measured as pounds of coating on the surface of a 25 x 38-inch ream of paper.
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