Technical precision plastic injection molding in Hamburg – from tooling procurement to series production and assembly of complete modules.
Kunststofftechnik Hans Rethwisch GmbH
22525 HamburgNew on Amplifa
About KTR
Kunststofftechnik Hans Rethwisch GmbH (KTR) is a family-owned company founded in Hamburg in 1969 that manufactures technical precision parts by plastic injection molding. Its service portfolio includes standard injection molding, 2K injection molding, injection molding in a Class 8 cleanroom, insert molding as well as assembly of complete modules, post-processing and finishing such as ultrasonic welding, laser engraving and painting. Production is carried out on 24 electric and hydraulic injection molding machines from Engel and Arburg with clamping forces from 100 to 6500 kN and shot weights from 0.1 g to 2000 g. The material range extends from standard and engineering plastics to high-temperature and fluorinated specialty plastics, filled materials, bioplastics and recyclates. In addition to production, KTR handles tool management – planning, procurement, maintenance, repair and storage – with experience from around 3,000 tooling projects and a network of toolmaking partners; in-house mold making was discontinued in 2020. Its components are used in fields including medical technology, aerospace, automotive, mechanical engineering, electrical engineering and shipbuilding; production takes place at the company's headquarters in Hamburg.
- Site
- Hamburg
- Processes
- Standard injection molding, 2K injection molding, Injection molding in cleanroom (Class 8), Insert molding, Module assembly, Ultrasonic welding, Laser engraving, Painting
- Materials
- PEEK, PEI, PSU, PFA, PPS, PI, PTFE, PVDF
- Certificates
- DIN EN ISO 9001:2015, EN 9100:2018, ISO 9001, EN 9100
- Founded
- 1969
- Industries
- Medical technology, Dental, Aerospace, Automotive, Construction, Electrical engineering
- 01
Tool planning and 3D filling simulation
- 02
Tool procurement via partner network
- 03
Injection molding production (standard, 2K, cleanroom, insert)
- 04
Post-processing and finishing
- 05
Module assembly
- 06
Logistics
Locations
Hamburg
DEProduction and administration
- Part weight / size
- 0.1 g to 2000 g shot weight
- Lot size
- Prototypes to series production
- Materials
- Technical thermoplastics, high-performance plastics, bioplastics, recyclates
- 24 Engel and Arburg injection molding machines (electric and hydraulic)
- Clamping forces 100–6500 kN
- Multi-axis robots and handling equipment
- Laminar flow cabinet (Class 8 cleanroom)
- Ultrasonic welding system
- Laser engraving system
Parts from the Molding Shop
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Standard injection moldingPlastics | – | 140 cm | 0.1 g – 2000 g | – | – |
| 2K injection moldingPlastics | – | – | 150 g + 50 g | – | ABS + TPU, PP and TPE |
| Injection molding in cleanroom (Class 8)Plastics | – | – | – | – | – |
| Insert moldingPlastics | – | – | – | – | Plastics with metal insert parts |
| Module assemblyAssembly | – | – | – | – | – |
| Ultrasonic weldingJoining | – | – | – | – | Plastics |
| Laser engravingSurface | – | – | – | – | Plastics |
| PaintingSurface | – | – | – | – | Plastics |
| Tool management (planning, procurement, maintenance, storage)Engineering | – | – | – | – | – |
| 3D filling simulation for tool designEngineering | – | – | – | – | – |
7 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Injection molding machines (electric and hydraulic) | Engel | – | – | – | Hamburg |
| Injection molding machines (electric and hydraulic) | Arburg | – | – | – | Hamburg |
| Injection molding machines total | – | 24 | Clamping forces 100 to 6500 kN; shot weight 0.1 g to 2000 g; 2K up to 150 g + 50 g | – | Hamburg |
| Multi-axis robots and handling equipment | – | – | – | – | Hamburg |
| Laminar flow cabinet (Class 8 cleanroom) | – | – | – | – | Hamburg |
| Ultrasonic welding system | – | – | – | – | Hamburg |
| Laser engraving system | – | – | – | – | Hamburg |
Additional services
Reference customers
Quality
KTR is certified to DIN EN ISO 9001:2015 and EN 9100:2018. Quality assurance includes proactive quality planning (FMEA), continuous monitoring and customer-specific quality assurance agreements, e.g. for aerospace and medical technology.
| Evidence | Hamburg |
|---|---|
| ISO 9001 | |
| EN 9100 |
History
- 1969
Founded in Hamburg in October 1969; the first article was a mixing capsule for dental filling material.
- 2020
Discontinuation of in-house mold making; tools have been procured via a partner network since then.