Abstract: An abrasive compound in which individual abrasive grains of various types are joined in a preliminary step into the formation of so-called agglomerated abrasive grains, each of which may contain a number of individual grains. The particular feature of the invention is that the abrasive compound which is to be applied to a suitable surface to constitute an abrasive or grinding tool consists of a mixture of agglomerated abrasive grains of substantially different types. The differences in the agglomerated abrasive grain refer principally to the abrasive power and strength and the ability to sustain abrading forces, i.e., they are related to the endurance of the agglomerated grains under conditions of use. The substantially different strengths or properties of the agglomerated abrasive grains may derive from different types of binder used to create them from the individual grains, different methods of hardening or drying, different quantities of binder, or different constituent individual grains.

Abstract: Abrasive grains are bound to a flexible support by a pattern of resin applied by means of a curved stencil having a wall thickness of 0.08 to 1 mm and having holes with a diameter of 0.05 to 3 mm, the total hole area amounting to 5 to 50% of the area of the stencil. A top binding agent is applied before or after the drying or hardening of the resin.