Customised finishing of metal surfaces with JETPEP

Producing smooth and high-gloss metal surfaces in a targeted manner is a key challenge in many industries. In particular, the finishing of complex component shapes is often associated with a low level of automation, process times of several hours and environmentally harmful processes that make it a high economic and ecological burden.

This challenge is solved by an innovative technology from TU Freiberg: JETPEP - that is selective plasma polishing with an electrolyte jet. In one process step, the component is cleaned, polished, sterilised and deburred. The process brings plasma polishing, already tested and proven in industry, into the third dimension, thus combining environmentally friendly electrolytes and highly efficient processing with the advantages of a selective process. With JETPEP, roughness values (Ra) of down to 0.03 µm can be achieved on almost all metals within a few minutes without pre-treatment.

JETPEP allows for the selective polishing of small and large metal components - exactly where the application really requires it. This makes the technology particularly interesting for:

  • the finishing of additively manufactured components
  • the automated polishing of weld seams
  • the achievement of highly smooth and functional surfaces in the medical, aerospace and automotive sector
  • highly efficient deburring after mechanical or laser-based processing
  • polishing, cleaning and sterilising in the manufacturing of chemical and food processing plants

Vincent Stepputat's team is developing a prototype industrial system in cooperation with interested pilot customers as part of the EXIST Forschungstransfer. Thus, by September 2023, JETPEP should not only be a market-ready polishing technology, but also the basis of an established and competitive company.

Project duration
10/2021 – 09/2023

The start-up team will be funded with approx. 1 million EUR by the EXIST Forschungstransfer Phase 1 of the Federal Ministry for Economic Affairs and Energy (BMWi). This programme was explicitly developed for outstanding research-based start-up ideas. The aim is to establish an invigorating start-up culture at universities and to create desirable jobs in the regions.


Prof. Dr.-Ing. Henning Zeidler

Prof. Dr.-Ing. Henning Zeidler

Head of the professorship

Karl-Kegel-Bau, Agricolastr. 1, room 90

phone +49 3731 39 3066
fax +49 3731 39 3658
henning [dot] zeidleratimkf [dot] tu-freiberg [dot] de

Head of the professorship for Additive Manufacturing
Dipl.-Ing. Vincent Stepputat

Dipl.-Ing. Vincent Stepputat

Research associate

Karl-Kegel-Bau, Agricolastr. 1, room 66 (Secretariat)

phone +49 3731 39 3723
fax +49 3731 39 3658
vincent [dot] stepputatatimkf [dot] tu-freiberg [dot] de

Project coordinator JETPEP