A coated abrasive article comprised of a backing having a layer of grains adherently bonded thereto by a binding material, wherein the layer of grains comprises abrasive grains and nonabrasive composite grains, and the nonabrasive composite grains comprise inorganic nonabrasive particles bonded...http://www.google.se/patents/US5702811?utm_source=gb-gplus-sharePatent US5702811 - High performance abrasive articles containing abrasive grains and nonabrasive composite grains 
