Types of coated abrasives

Coated abrasives come in various forms: as sheets, the traditional form; on rolls, which are easy to handle and usually more economical; and as discs, which usually have a Velcro backing and arc used for power sanding. The grains are arranged on the backing in one of two ways: closed coat, where the abrasive grains cover 100% of the coat side surface of the backing; and open coat, where the individual grains are spaced out. In open coats, about 50-70% of the coated surface is covered with abrasive.

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