New Technologies

Gräbener Maschinentechnik stands for 15 years of experience concerning the production of microstructure metallic plates.

The division "new technologies" pools the know-how of the entire value added chain. From forming, cutting and welding to the issues of an optimum coating and sealing and finally up to the µ-accurate measuring and testing, there is one common principle: "Highest quality is our standard."

Customers profit from this know-how in several sectors: apart from the production of metallic separator plates (for NT-PEM-, HT-PEM and NT-PEM electrolysis) Gräbener offers a comprehensive range of engineering services. In addition to this, GMT also provides support concerning the ramp-up management and helps series suppliers with the implementation of an economic production line.

From the initial sample to the scale-up and beyond: Gräbener Maschinentechnik is a competent technology and system partner in the fields of development and production of mass-producible separator plates and microstructure plates.


Metallic bipolar plates and separator plates

In the sector of "new technologies", Gräbener Maschinentechnik is among the early developers and manufacturers of metallic separator plate units for NT-PEM, HT-PEM, DMFC and SOFC fuel cells as well as for NT-PEM electrolysis. In addition to this, Gräbener manufactures microstructure plates for high-performance heat exchangers. The division "new technologies profits from the know-how of the entire value added chain.

                       A brief overview of our range of services


Stainless steel, titanium, copper, plated materials, pre-coated materials

Wall thickness

from 50 µm

Piece count

Initial sample up to small series

Size of the work pieces

from 1 cm² up to 12 m²


Hydroforming, stretch drawing, pressing

Press forces

12.5 up to 10.000 to


However, independently of the described range of services, there is only one thing that is most important: the customer's wishes. Over the last 15 years, Gräbener Maschinentechnik has been specializing more and more on customized solutions. Gräbener Maschinentechnik profits exceedingly from the process know-how of the conventional divisions and even owns a world-class hydroforming prototyping center. A total of four hydraulic presses with closing forces of 1,5000, 2,500, 6,500 and 10,000 tons are available to the customer for prototyping, trial and small series production.
Gräbener Maschinentechnik, as part of the fuel cell industry in Germany and as a board member of VDMA consortium for fuel cells ("Arbeitsgemeinschaft Brennstoffzellen"), puts much effort into the research & development of how to provide future energy supply with competitive and optimized components and units.



PowerBoxx® and PowerTower®


The PowerBoxx®, a development within the competence network fuel cell and hydrogen in North Rhine-Westphalia, has been developed especially for the production of metallic separator plates. It was put into service at the beginning of 2006. The PowerBoxx® has a closing force of 65,000 kN and can form separator plates up to a total surface of 400 cm² using the Opens internal link in current windowhydroforming process. Various materials such as 1.4301 or even titanium are feasible.

Based on the well proven PowerBoxx® technology Gräbener Maschinentechnik then developed the PowerTower®. This production technology with worldwide patents is used for helping customers realize an economic series production of metallic separator plates.



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