Abstract: The invention relates to a carbon brush, which is impregnated with a modified siloxane.

Abstract: The invention relates to a carbon brush which is impregnated with a synthetic ester oil.

Abstract: The invention relates to a carbon brush (10) with a braided indicator wire (26), (28) for indicating a defined wear of the carbon brush. The braided indicator wire is embedded in a blind bore (30), and is disposed spaced apart from the bottom (32) of the blind bore. To assure an exact indication of the wear of the carbon brush, the bottom of the blind bore is covered with a layer (40) consisting of an insulating material.

Abstract: An impregnated carbon brush for electrical machinery with improved running properties and increased wear-resistance, in which the carbon brush has an impregnating medium containing non-melting grease, and/or a non-melting wax, and/or a non-flowing oil. The impregnating medium in the carbon brush is on a synthetic, mineral, animal or vegetable base which is thoroughly mixed with a gelatinizing agent on an inorganic and/or organic base and thereby transformed to a non-melting or non-flowing harder and more wear-resistant condition. The gelatinizing agent contained in the carbon brush as a component of the impregnating medium comprises montmorillonite flakes with surfaces coated with long-chain hydrocarbons. The carbon brush includes additives for improving the sliding properties in the form of inorganic and/or organic additives such as metal sulfides, metal oxides and PTFE powder. The carbon brush contains 0.1 to 25% by weight of impregnation medium relative to the weight of the impregnated carbon brush.