IonoFil - Wire cutting dielectric

Following on the experience and success with its dielectrics in the field of electrical discharge machining (EDM), oelheld has now set itself new targets. Whereas high-quality hydrocarbons have been successfully used for decades in cavity-sinking EDM, water is still used in wire EDM – and that despite the numerous associated disadvantages.

Particularly when machining carbide metal, cobalt leaching and hence also corrosion present a problem that is difficult to overcome. That is why oelheld together with leading companies in the EDM field and the University of Louvain (Belgium) decided to set up a research project to develop a hydrocarbon-based dielectric that is designed specifi cally for the wire EDM technology.

The result is IonoFil wire cutting dielectric.

Benefits of our dielectric for wire cutting:

  • No cobalt leaching with carbide metal
  • Better surface qualities
  • No corrosion on workpieces and the machine
  • Better precision machining thanks to smaller spark gaps
  • No microbiological attack
  • Reduced thermal shock
  • Less heat cracking

In our brochure you will find all information about IonoFil, the longstanding development as well as the advantages of the product. 

Download the brochure of IonoFil

The service lives of carbide punches, in particular, can be enormously prolonged by preventing cobalt leaching. Laborious and cost-intensive deionisation of the water with resins, corrosion protection – before, during and after machining – and frequent changing of the medium are now things of the past thanks to this development. IonoFil as dielectric allows smaller spark gaps to be used, thus permitting far better precision machining, e.g. with closer radii. The quality of the surfaces increases to the same extent, with peak-to-valley roughnesses of down to Ra 0.1 μm being achieved far faster and easier than with water.

A convincing argument, particularly at a time when the industry is making ever higher quality demands on its suppliers and on the manufactured parts.

Clearly to be seen in the upper figure are the spots where water has significantly damaged the surface and permitted corrosiondue to the leaching of cobalt.
Undamaged surface machined with IonoFil.

The use of hydrocarbon-based dielectrics requires a modification to the machine and application technology. Please contact us, should you have any questions.


Phone: +49 711 168 63-0
Fax: +49 711 168 63-3500
E-mail: hutec(at)



Specialist for lubricants at GrindTec in Augsburg

GrindTec Augsburg

Are you looking for the right lubricant for your process? We have just that for you...

This website uses cookies

By using the site you agree to the use of cookies. For more details see our privacy policy