amixon® appliances are beared and driven only above the mixing chamber. No shaft passage is in direct contact with the material being mixed. This design is generally considered to be extremely hygienic and extremely low in maintenance, as the gasket must only seal against the gas atmosphere. In the case of the amixon® mixing technology, the sealing is carried out as a multi-layer lip seal. The lip is designed such that it rests on a ceramic sleeve and can be serviced and replaced without disassembling the gear box and motor. In addition to the low-maintenance design, the required downtime is reduced to a minimum. The hygienic lip seal is permanently gas- and water-tight and also suitable for vacuum and overpressure operation.