A coated abrasive product has abrasive particles secured to a flexible backing by maker and size coats, each abrasive particle consisting essentially of an agglomerate of fine abrasive grains having an average diameter less than about 200 microns and an inorganic, brittle, matrix. The volume percent...http://www.google.de/patents/US4311489?utm_source=gb-gplus-sharePatent US4311489 - Coated abrasive having brittle agglomerates of abrasive grain
