dynamic operation of actuators or sensors especially when used in automotive technology in conjunction with fuels chemically stable especially non swellable passivation materials can be used as a result of the novel passivation method especially irregularly shaped rough or uneven surfaces or surfaces which are unfavorable in any other way especially of piezo stacks can be passivated likewise plastic sleeves can be used for a simultaneous coating of four side surfaces especially of a piezo stack likewise by means of an lamination process according to various embodiments two opposing side surfaces can be laminated in a simple manner the use of conventional ink jet methods is likewise possible in this way a direct structuring of the passivating insulation layers can be undertaken advantageously a plastic foil or a plastic sleeve featuring for example epoxides or polyimides can be laminated on as the insulation for example this means that the advantages mentioned above can be implemented in an especially simple manner especially advantageously before the application of the insulation electrode areas for example may be covered or sealed by means of kapton foil or metallic structures to prevent the adhesion of the insulation the openings can be created in a simple manner by mechanical or physical removal of the insulation especially advantageously a layer of insulation can be printed on as insulation in a simple manner for example by means of an ink jet method and hardened using uv radiation and or temperature for insulation against fuel physically and chemically stable materials in particular can.