Main tools contract manufacturing is an important part within the Maincor AG.
With almost 100 employees, custom products for a variety of applications are manufactured.

The main industries are:
- Mechanical Engineering
- Food Industry
- Sanitation sector
- Printing Industry
- Automotive (Development)
- Medical
- Racing (Formula 1)

Due to the different requirements exist decades of experience in a wide range of materials and technologies.
The numbers go from item and prototyping to series production in three shifts.

As an owner-managed innovative company that acts as a supplier for all industrial sectors, we attach particular importance to comprehensive personal customer service. Mutual respect and a lived partnership are very important to us.
We develop and produce products according to individual customer requirements. In doing so, we contribute our many years of experience, from development through production to final assembly, in order to develop an optimal solution for every customer requirement from all industries. From customer-specific new development to sample production to special productions in small series including assembly, you get everything from a single source.
Our company is centrally located in Germany on the A2 motorway, about 5 minutes from the Porta Westfalica exit.

Over half a century of experience
Your competent contact

With over 60 years of experience in the field of plastics processing and now 7 years in machining, our company is one of the most renowned contacts in a wide variety of industries. Since the founding of Karl Müller in 1958, our company has continuously developed and has meanwhile become a powerful partner in the production of technical plastic injection molded parts and machining in the 3 and 5-axis milling area.

"Success is what drives us, quality is our obligation"

As a medium-sized, owner-managed company, we design and produce solutions from thermoplastics for various branches of industry. And that for over 25 years now.

Competently. Flexible. Successful.

It is a long way from the idea to the finished product, which can only be successfully trodden when all factors for production are optimized and harmonize - from the idea, the individual development and construction by qualified employees to reliable logistics. Prototyping and the latest process technology are just as indispensable as the right materials and tool concepts.

Everything at the highest quality level.

Guaranteed. Certified.

Welcome to Kunststofftechnik Hans
Rethwisch GmbH

Produced according to your wishes and requirements
Kunststofftechnik Hans Rethwisch GmbH technical
Precision parts in the injection molding process.

We are your partner for both individual
Special designs as well as for large-volume
Serial production.

Our customers come from the fields of construction,
Electrical engineering, aviation, mechanical and plant engineering,
Medical technology, nautical articles, shipbuilding,
Security technology, petrol station and tank truck technology,
Defense and pyrotechnics

Materials?

All thermoplastics, whether glass fiber,
carbon fiber or otherwise reinforced or modified,
from PVC and PS to CAPA, PE, PP, PMMA, PA, PC to PFA,
PSU, PEI and PEEK and many more as well as polyurethanes (TPU).

The "exotic" are standard for us! Custom
Coloring: Yes! We are happy to advise you and accompany you
Development to find the optimal properties for your product
to realize.

We always combine current and powerful technology,
Expertise and years of experience of our
highly qualified staff to ensure effective and
to ensure efficient production.

Plastics Processing
series production

We offer you plastic injection molding of the highest quality at fair conditions. In the injection molding process, plastic granules are plasticized and then injected into a mold under high pressure. In this way, plastic parts between 0.1 g and 2500 g can be produced quickly and inexpensively in large, medium and small series.

Due to our customers in the automotive and sensor technology industry, our production is designed to guarantee all the highest quality standards. With the help of the most modern processes and technical systems, we guarantee very high dimensional accuracy, precise weights and accurate colouring. We also help you to optimize the mechanical properties of your product by selecting the optimal material and any post-processing steps together.

Many years of experience with a wide range of products have allowed us to continuously optimize our processes. This enables us to react flexibly to your wishes and to produce a large variety of articles. Our interdisciplinary team examines your molds and products in order to develop an optimal manufacturing process. This reduces waste and process costs, so we can offer you a fair price-performance ratio.

We are a developer and supplier of injection molded parts, injection molds, mold repairs and contract manufacture of plastic parts.

Our customers value us as a reliable and innovative system supplier.

Our competencies: Development of plastic parts, design, production, sales, project management, process development, tool and mold making, quality, service and logistics.

Our small company structure, the high personal goals, is the ideal basis for our services.

We are a full-service supplier with good and flexible logistics.

KWM is a competent partner in the development and manufacture of sophisticated plastic injection molding parts. Special experiences are for thick-walled products before (also foamed in the TSG process) and PUR integral foam moldings. Competitive and dynamic development constantly affect our position. Our goal is to constantly expand the performance. Customer satisfaction and competence are regarded as key success factors.



Efficient process control and modern technology combined with the know-how and dedication of our employees, we see as the key factors in achieving our business goals.



Our services cover the entire value chain, starting with the development mold, production, completion, storage and shipping. One of our main goals is to offer its customers everything from a single source.



Our machine park currently includes 20 injection molding machines from 40-1.000 tons clamping force. The focus is on medium to high weight range
(About 10-4300 g piece weight).