Surface technology for the most demanding applications
Stamping and forming determine the function and geometry of the manufactured perforated sheets. Surface treatment follows as a separate production step and provides these products with lasting protection.
Electrocoat and powder coating are specifically tailored to the perforation pattern, material, and edge quality. This results in durable corrosion protection that preserves the technical quality of the perforated sheets and sheet metal parts over the long term while also enhancing their appearance.
As a manufacturer of perforated sheets and sheet metal parts, Graepel handles all process stages in-house—right through to the coated series component. For you, this means end-to-end manufacturing with clear technical accountability.
Surface engineering processes
Electrocoat (KTL)
The KTL coating is ideal for components with complex geometries, embossings, and hole patterns.
Advantages:
- Uniform coating thickness, even at edges
- Excellent corrosion protection
- ideal for finely perforated structures
- optimal adhesion base for additional powder coating
The process begins with a multi-step cleaning process and a nanoconversion layer before the component is immersed in the coating solution and baked.
Sustainable coating processes
Graepel continuously invests in environmentally friendly surface treatment technology.
- Modern membrane filtration reduces water consumption by up to 50%
- Powder coating recycling prevents material loss
- Optimized coating formulations
- Energy-saving oven and process controls
This results in coatings that are not only high-performance but also resource-efficient—particularly important for OEMs in automotive manufacturing, agricultural machinery, and industrial plant engineering.
Quality Assurance – Tested in Our Own Laboratory
All coatings are tested in Graepel’s own laboratory, including through:
- Salt spray tests
- Corrosion tests
- Coating thickness measurements
- Adhesion tests
Strict quality controls ensure that performance, protection, and appearance meet the requirements of international customers. The close integration of manufacturing, surface treatment, and the quality laboratory enables reliable and functional mass production.
"At Graepel, surface treatment stands for safety, durability, design, and individuality. We not only finish our customers' components, but also develop our own market solutions based on the experience we gain through our projects. Examples of such successful solutions include Graepel DuraVent and Graepel-ColorGrip. Both products are the result of many years of expertise and development work."
Jan Hiltermann
Head of Controlling, Graepel
FAQ
Graepel uses electrophoretic coating (KTL) and powder coating—ideal for complex geometries, perforated sheets, and embossed structures.
Through optimized paint formulations, nano-conversion coatings, precise process control, and our own quality laboratory equipped with salt spray and corrosion testing facilities.
Membrane filtration reduces water consumption, powder coating is recycled, and energy-efficient systems minimize resource requirements.
Yes. KTL and powder coating are specifically designed for complex hole patterns and ensure uniform coating even on edges and embossed areas.
