The flat seal has sealing surfaces of polymer material and its first (1) and second (2) sealing surfaces are formed by a fleece material reinforced cover layer. At least the two cover layers (3,4) commonly represent a flexible conductor plate (5). The material of the conductor plate enclose completely electrical conductor tracks (10) in the sealing areas. The conductor tracks are provided with connecting conduits (6), which are fed with connecting surfaces (8,9) out of the conductor plate. The material of the cover layers has an electrical resistance of at least 10<8> ohms and is formed as insulation for the conductor tracks. <IMAGE>