Airtight components are critical
to production quality

What we build are machines. What we deliver is reliability.

Leak testing is an important step in the validation of component quality in the automotive sector, medical technology, fittings technology and many other industries. Only through precise component testing can you be sure that your products are also functioning reliably. We build machines for leak testing, providing the sense of certainty that comes with outstanding quality assurance for your products.

Our work always starts with your component. You provide us with testing pressure and permissible leak rates, and we do the rest. We identify the optimal test procedures that will quickly, precisely and consistently determine whether your part fulfills the defined requirements. Various factors are taken into consideration in the selection of the testing procedure, such as pressure, volume, testing procedure time and the clamping forces that may affect a component.

We design and build machines and testing devices for various air and gas test procedures according to the general conditions.

Rubber seal mounting to the machine
Rubber seal mounting to the machine
Rubber seals are essential for a reliable measurement result.
Production of molded seals
Production of molded seals
Since the molded rubber parts are such important components, we are in charge of all aspects of their production.

The base of leak testing

The sealing concept Forms the foundation

A well-engineered sealing concept is the foundation of durably accurate leak testing. A large part of our expertise is in this very area. Answering crucial questions is of the essence:

How and in what order are components sealed? How can various test spaces be measured using the right test procedure? What order are components tested in? What is the mechanical sequence? What kind of clamping forces are likely to act on the component?

The design for these complex processes is developed and worked out by our engineers, master craftsmen and technicians, and coordinated in detail with our customers.

We are in charge of production, from equipment to consumables.

Rubber seals are of crucial importance in this process. They serve as the connection between testing device and component. Their quality determines the precise testing position and is essential to a reliable seal. Due to the elementary importance of these aspects, we produce seals in-house, providing significant advantages for our customers:

  • perfect matching of sealing device and component
  • consistent quality
  • quick, long-term availability


The right
testing procedure for your component

Depending on the component and the desired leakage rate, different testing procedures are necessary to ensure the specific tightness according to the given parameters. Measurement procedures with air are common and cover many various requirements. Measurement procedures with gas cost more time, effort and money, but can detect even smaller leakage rates. If components do not meet the desired requirements, leak localization may be necessary in order to find the defects.

Leak testing on a component
Leak testing on a component
Highly complex: Each component puts very specialized demands on our machines.

Air testing

Test procedures and leak localization


The pressure difference procedure is inexpensive and is especially suitable for small testing volumes. A pressure difference transmitter detects drops in pressure. The system can calculate the leakage rate based on the configured testing volume.


The mass flow test is suitable for larger testing volumes in order to achieve shorter cycle times. The test air is siphoned from an external solid volume into the component. After pressure equalization, the air flow escaping from the component is measured. As a result, a stable measurement result is achieved.


Flow testing is used to determine whether openings, such as bore holes, provide the required permeability. It is possible to determine closures of ≥30% with this procedure. The back pressure test can identify bottlenecks precisely by means of possible air back pressure.


As with pressure difference testing, vacuum testing uses negative pressure to test a component. This procedure is especially useful for components that cannot put up with high clamping forces.


For parts or prototypes whose leak testing results fall outside the standard range, the site of the problem can be precisely determined using leak localization. In a submersion test, the component is filled with air in a transparent water tank. Leaks can be precisely located through the formation of bubbles. Alternatively, the sealed and helium-filled component can be checked using a leak sniffer.


Gas testing

Helium accumulation test

By comparison to measurements using air, the helium accumulation test helps to identify significantly lower leakage rates due to the usage of a mass spectrometer.
This method requires a separate test chamber where the component needs to be clamped.

Step 1

First, the component is checked in a measurement procedure using air. This is to ensure that no helium contamination of the environment occurs if gas testing reveals large leaks.

Step 2

Provided that the values of the air testing are within the standard range, the testing device is sealed off, and the component is filled with helium. Using a fan, potentially escaping helium is evenly distributed within the test chamber.

Helium for the gas testing of a component
Helium for the gas testing of a component
Gas testing can detect even smaller leaks and is often combined with air testing.



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Additional information

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To reference, cylinder head assembly

Reference: CYLINDeR HEAD assembly

We combined all of our core areas to create a complete system for the supplier of a well-known auto manufacturer from southern Germany.

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To machine design

Our machine design

Our machines are characterized by robust, solid construction, which has proven equal to the task of continuous industrial use over the years.

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