Open-Coat Construction Minimizes LoadingSandpaper discs cut better and last longer when dust isn't loading the cutting surface of the abrasives. Reducing dust is easier than ever with 3M Xtract™ sanding discs. An open coat means the abrasive grains have space between them so that sanding debris collects in the spaces rather than loading the cutting edge of the grains. The load resistant coating allows the disc to continue cutting even when sanding softwoods, paints, and other materials that would, otherwise, clog the disc and hinder sanding ability. Meanwhile, the innovative multi-hole pattern extracts dust better than 5- or 6-hole products — increasing cut and dramatically increasing disc life.