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 cutting material for the spindle extensions with millimetre precision. Complex components are turned and milled in the CNC department. Our specialists then assemble the individual parts and assemble the assemblies.

The first milling machine including automation system was purchased in order to drill holes in square caps and coupling sleeves according to customer requirements. Today we’re a lot further along. The small department grew into a mainstay of Schönborner Armaturen GmbH. As a contract manufacturer, we process prototypes and small series for various industries and manufacture injection moulds for our plastics production.

Our own demand for protective tubes is approximately 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 we manufacture the individual parts for our extension spindles. Herewith we are available as a contract manufacturer including tool construction.

Materials used and methods of manufacture

Plastics processing – precision from a single source

For the supply of water and gas to private households and public institutions, as well as for the discharge of waste water, safe and precisely closing connections are required. For many decades the operation of the valves should be guaranteed without any functional restrictions. In order to do justice to this functional reliability, we develop and manufacture protective tube systems specially designed for this purpose. 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. Precision parts with a wide variety of shapes and flexibility are produced from standard plastics as well as specially developed plastics.

Your advantages

  • high forming variety and accuracy
  • short production times
  • low component costs
  • low weight
  • heat and sound absorbing as well as electrically separating
  • weather and chemical resistant
  • no postprocessing
  • good colouring even without lacquering

The necessary work steps leading to the desired component are carried out quickly. An injection mould is used to inject the plastic heated to melting temperature under high pressure into the cavity of a mould. n order to maintain the required dimension of the tool permanently, 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, plastic enables mass production components within an optimised cost framework.

Nevertheless, a high quality and enormous resistance of the product is guaranteed. Highly detailed components can be produced in large quantities in a short time. Manual postprocessing is possible, but not mandatory. Because of the numerous advantages of plastic, we also use a wide variety of thermoplastics in our products, as well as talcum or glass or natural fibre-reinforced materials. For example, with a clamping force range of 500-1,500kN, we realize part weights of 4-200g depending on the workpiece in an injection molding process and extrude tubes with diameters 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. As early as 1958, the trademark “stainless steel” was introduced in order to clearly identify the 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 recognisable at first glance.

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

Your advantages

  • high corrosion and temperature resistance
  • good thermal conductivity and permanent tightness
  • premium quality
  • optimal hygienic conditions
  • high strength and resilience
  • easy processing and high material elasticity
  • long product life and low follow-up costs
  • low maintenance
  • beständig gegenüber Frost, UV-Strahlen, Säuren und Nässe

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

The proverb “as hard as steel” therefore applies 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 mostly consist of a combination of zinc and aluminium flakes, which are connected by an inorganic matrix. You will often find their application where corrosion protection is of major importance. The zinc lamella is particularly convincing when working with mass-produced small parts such as screws or spring band clamps because of its extremely thin layer thickness and yet high load-bearing capacity.

Your advantages

  • high load-bearing capacity
  • wafer-thin film 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. As a result, the zinc flake coating is particularly suitable for products that require high resistance and a perfect fit.

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

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

You can also print out a summary of all the information as a product sheet. This is part of the Schoenborn product catalogue. f you would like to file your collected forms in a Schoenborner folder, simply send us an e-mail with your contact details to:

We will gladly send you the free folder.

Your contact person:

Mr. Thomas Ebert

P.: 035322 5110-0


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