Facts and numbers


Aerotechnik E. Siegwart GmbH

Seat of the company:
Friedrichsthal (Saarland)


approx. 180

Andreas Schiekofer


  • Certified according to DIN ISO 9001
  • Worldwide distribution
  • Computer-controlled high rack warehouse with 5000 places for Euro pallets
  • Various laser welding plants for tube bodies and bends
  • Various test benches for quality assurance
  • Short-notice and punctual fulfilment of delivery requests


  • Multi-leaf dampers
  • Folded spiral-seam ducts
  • Aluflex ducts
  • Volume flow controllers, laser-welded
  • Shut-off dampers and throttle valves, laser-welded
  • Weather resistant louvers
  • Attenuators
  • Fittings, laser-welded
  • Smoke protection dampers


Emil Siegwart founded the company Aerotechnik E. Siegwart in Friedrichsthal/Saar together with his son Wolfgang. At first they produced with ten employees on an area of 500 m².

Company converted into a GmbH. Father and son, together with their employees, quickly lead the company on a path of growth. Emil Siegwart focuses on the development of new products and processes, and Wolfgang Siegwart deals with the commercial management as well as the process control and optimisation.

To create the conditions for more flexibility, shorter lead-times and on schedule deliveries, a computer-controlled high-rack warehouse with initially 3400 euro pallet storage positions was commissioned in 1985/86.

Later, the high-rack warehouse was expanded by further 1600 euro pallet storage positions.

The commissioning of a “world-wide probably unique laser installation” Wollermann-Windgasse, Head of Trumpf Lasertechnik GmbH, Ditzingen).

Emil Siegwart did not want to accept that for the most part, the power of the laser remained unused because of the extremely short welding time. He provided the Trumpf laser specialists with the basic idea of process engineering: One computer-based 5 kW-CO2-laser respectively supplied 5 laser stations.

On 5 October 2000, on the recommendation of Dr Peter Müller, Minister President of the Saarland, the 80-year old Emil Siegwart, was awarded with the Federal Cross of Merit for his accomplishments. In the award ceremony the Saarland Minister for Economic Affairs, Dr Hanspeter Georgi, especially commended the commitment and entrepreneurial spirit of the successful inventor.

The product range is consistently expanded and new staff employed. In 2000, the production floor space increased to 6000 m² and a staff of approx. 150 are employed.

The success story of the company headed by Emil and Wolfgang Siegwart continues. In 2002, the company continues to focus on growth. The production capacities are increased and the site is initially expanded with a new production hall and an additional laser welding plant, by 500 m².

Following the motto “Committed to progress”, 7% of the turnover is, as was always the case, invested in research and development as well as in machines and equipment.

Expansion of the storage and production capacity by acquisition of an additional hall.

Emil Siegwart, the successful inventor and founder of the company, passed away at the age of 93 years. Today, his son Wolfgang and grandson Andreas, continue to manage the family business.

Conversion of the hall acquired in 2002, to open up a further 400 m2 of production and storage space.