The main characteristic of our production is the vertical range of manufacture. The required plastic components are extruded and injected in our company. Our NC high-performance cold circular saw cuts the punching material for the spindle extensions with millimetre precision. Complex components are turned and milled in the CNC department. Afterwards, our specialists assemble the individual parts and pre-assemble the assemblies.

The first milling machine including automation system was purchased to drill holes in square protectors and coupling sleeves according to customer requirements. Today we are much further ahead. From the small department grew a supporting pillar of Schönborner Armaturen GmbH. As a contract manufacturer, we process prototypes and small series for various industries and manufacture injection moulding tools for our plastics production.

Our own demand for protective tubes is about 800km per year. This is longer than the distance from Hamburg to Munich. For this reason we invested in our first plastics machine, an extruder, in 2008. In the meantime two injection moulding machines have been added. On these machines we produce the individual parts for our installation sets. Herewith we are available as a contract manufacturer including toolmaking.

Used materials and manufacturing processes

Plastics processing – precision from a single mold

Safe and precise closing connections are required for the supply of water and gas to private households and public facilities as well as the discharge of waste water. Over many decades, the operation of the fittings should be guaranteed without any functional restrictions. In order to meet this functional reliability, we develop and manufacture specially designed protection pipe systems. Plastic extrusion for pipe production as well as injection moulding for the production of cover caps, round bells, adapters etc. form the basis for this. Standard plastics, but also specially developed plastics are used to produce precision parts with a high variety of shapes and flexibility.


  • high shaping variety and accuracy
  • short production times
  • low component costs
  • low weight
  • heat and sound absorbing and electrically separating
  • weather and chemical resistant
  • no postprocessing
  • good coloring even without painting

The necessary work steps leading to the desired component are carried out quickly. An injection mold is used to inject the plastic heated to melting temperature into the cavity of a mold under high pressure. In order to permanently maintain the required dimension of the tool, the material is then pressed under low pressure until the plastic is compacted. It then cools down and the workpiece is automatically removed from the tool. Compared to other materials such as glass or metal, the plastic allows mass production of components within an optimized cost framework.

Nevertheless, a high quality and enormous resistance of the product is guaranteed. Detailed components can be produced in high quantities in a short time. Manual finishing is possible, but not absolutely necessary. Due to the numerous advantages of plastics, we also use a wide variety of thermoplastics, as well as talcum, glass or natural fiber reinforced materials for our products. We use processes such as extrusion and injection moulding. For example, with a clamping force range of 500-1,500kN, depending on the workpiece, we realize part weights of 4-200g in injection molding and extrude pipes in the diameter range up to approx. 70mm.

Stainless steel – Quality by brand

Stainless steel, probably the most commonly used production material today for areas where moisture plays a decisive role. Therefore, the trademark “Edelstahl Rostfrei” (stainless steel) was already introduced in 1958 to clearly identify products of quality-conscious manufacturers, processors and suppliers. We are also allowed to use this trademark for our products because we offer quality that is recognizable at first glance.

Of the 120 different types of stainless steel known today, the most frequently used stainless steel is material number 1.4301. A high proportion of 17.3-19.3% chromium, which must be dissolved in the austenitic or ferritic solid solution, repels any aggressive substances such as moisture, frost or UV rays and even acids.



  • high corrosion and temperature resistance
  • good thermal conductivity and permanent tightness
  • high quality
  • optimal hygienic conditions
  • high strength and resilience
  • easy processing and high material elasticity
  • long product life and low follow-up costs
  • low maintenance effort
  • resistant to frost, UV rays, acids and moisture

V2A or V4A stainless steel is used, depending on the application. The V2A stainless steel is the stainless steel used in everyday life, e.g. for vehicles or fittings, whereas the V4A stainless steel with about 2% more molybdenum is even more resistant to corrosion and is therefore often used in swimming pools, seawater or the chemical industry. In addition, even temperatures of up to 300 degrees Celsius cannot have a negative effect on the quality of the 1.4301 stainless steel.

The saying “as hard as steel” is therefore true to the extent that damage to the stainless steel by external influences is virtually impossible. The increase in corrosion resistance can be achieved not only by adding molybdenum, but also by adding nickel and other alloying agents.

Zinc flake systems – More than just corrosion protection

Zinc flake coatings usually consist of a combination of zinc and aluminum flakes, which are connected by an inorganic matrix. They are often used where corrosion protection is of great importance. The zinc flake is particularly convincing when working with mass-produced small parts such as screws or spring band clamps due to its extremely low layer thickness and yet high load-bearing capacity.


  • high load-bearing capacity
  • wafer-thin layer thickness
  • high accuracy of fit
  • no hydrogen induced stress corrosion cracking

At just 8-12μm, the zinc flake is significantly thinner than conventional corrosion protection systems such as powder coatings or hot-dip galvanizing – even thinner than a human hair. Nevertheless, it guarantees a protective effect of up to 1,000 hours against base metal corrosion in the neutral salt spray test according to DIN EN ISO 9227. Consequently, the zinc flake coating is particularly suitable for products that require high resistance and accuracy of fit.

If you would like to find out more about zinc flake coatings, please visit the website of Dörken MKS. There you will find everything you need to know about coating solutions:

If you have any questions or require additional information, please get in touch with the contact person listed below.

All information can also be printed out as a product sheet. This is part of the Schoenborn product catalog. If you would like to store your collected forms in a Schoenborn folder, simply send us an e-mail with your contact details:

We will gladly send you the free folder.

Your contact person

Herr Thomas Ebert

Tel.: 035322 5110-0


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