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Treotham Automation’s range of Hygienic Design Gearboxes meet the most stringent requirements of the food and pharmaceutical packaging industries and are designed and certified according to EHEDG (European Hygienic Engineering & Design Group) rules to ensure optimal material resistance and cleanability.
With their coaxial, dynamic planetary gearheads available in several different performance classes, the Hygienic Design Gearboxes have been designed to provide robustness, resistance and cleanability – the three key elements when determining the housing design, choice of materials and processing techniques for any hygienic gearboxes. 
The gearbox housing is also completely free of edges, dead spaces and gaps that could provide a breeding ground for bacteria or microorganisms or act as dirt traps. 
Just like its adapter plate, the gearbox housing is manufactured from stainless steel 1.4404 / AISI 316L – a low carbon steel that is approved by the US FDA (United States Food & Drug Administration) for food contact that offers high resistance to cleaning and washdown fluids such as disinfectants containing hypochlorite or chlorinated alkaline foam cleaners.
All stainless steel surfaces of the Hygienic Design Gearboxes are electro-polished with a roughness of either 0.8 µm Ra, as stipulated for food processing applications or 0.4 µm Ra, which is the accepted standard for the pharmaceutical industry. 
This special surface treatment has two big advantages: it minimises the risk of product residue adhesion and helps disinfectants or cleaning materials drain off after the allocated exposure time without leaving any residues.
The seals on both the motor and the output side of the gearboxes are made from PTFE or Polytetrafluoroethylene – better known as Teflon – a chemically inert material that is resistant to heat as well as to a wide range of media. 
Owing to its hygienic surface properties and non-stick effect, PTFE also conforms to the requirements of the US FDA and is suitable wherever hygienic cleaning is a legal requirement in the manufacturing process.

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