Abstract: A brush bristle material comprising a linear metallic material containing powders of one or more kinds of lava abrasive grains and/or basalt abrasive grains in a mixed state at a ratio in the range of 1% to 70%, preferably in the range of 1% to 30%. The powders of the lava abrasive grains and/or the basalt abrasive grains to be included in the linear metallic brush bristle material are incapable of being burnt and melted during the course of the inclusion and capable of enhancing the ability of grinding or abrading. Therefore, it is made possible to optimize the surface treatment of the interior of a hole in a given workpiece and the removal of a burr by grinding and a brush manufactured from the linear metallic brush bristle material.

Abstract: A brush bristle material has at least one kind of diamond abrasive grains or abrading grains contained in a mixed state in a synthetic resin material formed of single threads. The synthetic resin material, while being formed into a linear material from chips, is caused to contain in a mixed state the abrasive grains and eventually manufactured into one brush. A plurality of at least one kind of brush bristles are bundled and consequently finished as a brush bristle material. The covering containing in a mixed state the abrasive grains encloses the bundle from the part excluding the part fixed by the tubular body through the distal end part. Though the brush bristle material has been at a disadvantage in revealing weak nerve due to a large bristle height, the covering has succeeded in canceling the disadvantage. This invention concerns a brush bristle material and a brush for a tubular brush or a segment brush having a large brush bristle height.

Abstract: Brush bristles include filaments of synthetic resin material containing two or more types of abrasive particles selected from among diamond powder, stainless-steel powder, titanium powder, silicon carbide powder and aluminum oxide powder or silicon carbide or alumina abrasive grains.