Finishing and assembly:
added value from a single source

Vertical integration as far as you wish: we paint and imprint your components or assemble entire modules.

Finishing & assembly from the experts:
Downstream process steps from a single source

As a long-existing company in the plastics industry with close contact to our customers, we not only offer injection moulded products, but are also happy to take over the subsequent process steps. For example, we manufacture the upper and lower parts for an aircraft handle by injection moulding, and then join the two parts together with screws and nuts in our assembly department. Afterwards, the handle is painted and then subjected to a 100% inspection by our quality assurance department. As another example, we injection mould two half-shells for a floating measurement device. We insert a magnet into these before they are ultrasonically welded watertight. Here, too, a 100% leak test is carried out.

Advantages of assembly from KTR:

  • All production steps from one source
  • Reduction of your administrative effort
  • Cost reduction thanks to optimised process standards
  • Highest reliability from initial planning to the finished product
  • Clear & proactive communication
  • Customised solutions for your individual requirements

Finishing & assembly –
Our services for you

KTR not only offers you strong services from 2C injection moulding to cleanroom injection moulding and more - we also have a broad portfolio for you in the area of downstream process steps:

Ultrasonic welding

Joining of plastic parts without the addition of solvents or adhesives

Laser marking

Precise marking e.g. with article number and production date of plastic parts by means of laser engraving

Assembly of components

Joining of different parts injection-moulded by KTR to form finished components

Leak test

Checking the tightness of plastic parts and components


Controlled heat treatment to improve material properties


Texts or other markings, e.g. using the pad printing process


Adjustment of polyamide products to a controlled moisture level

Hot stamping

For example, inserting threaded bushings

Mechanical processing

Drilling, sawing, milling to your specifications


Up to final packaging

Do you have specific requirements for your finishing? Talk to our experts - together we will find the solution!

Finishing & more
at the highest level – KTR stands for quality

Kunststofftechnik Hans Rethwisch GmbH has been manufacturing technical injection moulded precision parts since 1969. In doing so, the satisfaction of our customers is close to our hearts - to this end, we develop customised solutions with expertise and experience and attach great importance to the high quality of our work.

Request your non-binding offer for your specific project - we will advise you individually and comprehensively!


Our sales team will be happy to advise you, just give us a call or make an appointment

+49 (0)40 881 56 88 0

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