The most important points at a glance
Custom plastic profiles are sensible when a standard profile does not cover function, geometry, or material requirements. They can bundle several tasks in one component, such as guiding, protecting, and sealing, thereby reducing additional parts and assembly steps. Jansen supports such projects from technical definition through development and toolmaking to series production.
What we repeatedly notice in practice: the biggest lever is often not the profile itself, but the system question. When Jansen develops a profile, it is rarely only about a cross section, but about the whole application that must function reliably later.
When are custom plastic profiles the better solution?
The solution fits especially well when you hit limits with a standard profile, for example in function, material properties, or geometry. Typical application areas are construction, industry, automation, sanitary engineering, furniture, and energy supply. In these projects, the catalog is not decisive but the concrete task in the component assembly.
- When a profile should take on multiple functions simultaneously
- When assembly effort, number of parts, or material mix should be reduced
- When geometry must precisely fit the application
- When a standard profile does not fully meet the requirements
| Solution | Typical strength | Typical limitation |
|---|---|---|
| Custom plastic profiles | Functions can be bundled, tailored to the application | Tooling costs and project effort must be worthwhile |
| Standard off-the-shelf profiles | Quickly available and often economical | Not ideal for special geometries or functions |
| Aluminium or steel metal profiles | Useful for very high mechanical loads or high temperatures | Often heavier and with different corrosion behavior |
| Molded parts | Suitable for 3D components without a constant cross-section | Not the obvious choice for long, uniform profiles |
Where are the limits of plastic instead of metal?
Contrary to the assumption that plastic is always the lighter and therefore automatically better choice, the constraints of the application decide in demanding scenarios. For very high mechanical loads, extreme temperatures, or special fire protection requirements, metal can be the better solution. That is exactly why Jansen assesses material selection early, instead of prematurely locking in profile geometry.
The most common mistake is comparing offers solely by unit price.
How does a project at Jansen proceed?
Jansen supports projects from technical definition through development to serial production. This includes construction, material selection, in-house toolmaking, sampling, testing, quality control, and kitting. The actual duration mainly depends on profile complexity, material requirements, tool construction, and customer approvals.
- Analysis of technical requirements and professional consulting
- Design, geometry optimization, and material selection
- Development and manufacturing of the extrusion tool
- Sampling, tests, and targeted optimizations
- Series production with quality control and assembly
What truly drives project duration
Duration is not only caused by the extrusion itself. Especially the complexity of the profile, material requirements, toolmaking, and internal approval processes on the customer side exert a strong effect.
What does a customized plastic profile cost?
Costs are calculated per project, based on technical requirements and expected production volume. A credible offer should transparently show services, assumptions, responsibilities, options, and economic framework. Pure price comparisons are therefore not very meaningful.
- Profile geometry and constructive complexity
- Material choice and possible reinforcements
- Tooling construction and development effort
- Testing requirements, tolerances, and post-processing
- Quantity and planned production volume
The common misconception is that the cheapest offer is the most economical in the end. If later tool changes, additional adaptations, or quality problems occur, total costs often rise only during the project.
What alternatives should you consider?
Key alternatives include metal profiles from aluminum or steel, molded parts, and standard off-the-shelf profiles. The right choice depends on whether you prioritise geometric freedom, mechanical robustness, quick availability, or low tooling costs. For many projects, the combination of function and volume decides.
| Alternative | When it fits | When it reaches its limits |
|---|---|---|
| Metal profiles | Very high loads, extreme temperatures, or special fire protection requirements | If weight, corrosion, or functional integration are critical |
| Molded parts | For complex, three-dimensional components without a constant cross-section | When long profiles with a constant form are needed |
| Standard profiles | When requirements are fully covered | When geometry or function must be individual |
From my experience at Jansen, it becomes clear early whether a project really needs a new profile or whether an existing standard profile is sufficient. This clarification saves not only development time but also prevents unnecessary tooling costs.
What does a practice example from mechanical engineering look like?
A typical project comes from mechanical and plant engineering: a profile must simultaneously guide, protect, and seal. Standard profiles are not enough for this. Jansen analyzes the application, develops the profile geometry, selects the material, manufactures the extrusion tool in-house, samples and tests, and then starts series production.
The result is a custom plastic profile that replaces several components and reduces assembly effort. Such projects show why profile extrusion is often more a technical development task than a product purchase.
Qualitative Praxisbeobachtung aus der Projektarbeit bei Jansen: Mehrere Funktionen lassen sich oft in einem einzigen Profil bündeln, sobald Geometrie, Werkstoff und Werkzeug gemeinsam gedacht werden. Für extreme Temperatur-, Last- oder Brandschutzanforderungen wird die Werkstoffwahl jedoch zuerst kritisch geprüft.
Frequently asked questions
When is a new development not worthwhile?
Why is unit price alone not a good decision metric?
What points must be in a credible offer?
What speaks against a plastic profile despite technical advantages?
If you are seeking a robust solution for a technical application, the right path starts with a clean requirements definition. Jansen then assesses whether custom plastic profiles, a different material choice, or an existing standard profile is economically and technically more sensible.
For development engineers and technical purchasers, this early classification is crucial: it reduces risk, shortens loops, and makes later series production more predictable. The goal is not a highly specialized profile, but the right solution for the application.
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Jansen AG, Oberriet SG