Our processes in detail



Aluminium in its raw state reacts in the air and forms an uncontrollable, often unwanted, unattractive oxide layer due to a reaction with oxygen or weather-related influences. You can read how to prevent this here.

, short for electrolytic oxidation of aluminium,
is a method of producing a protective layer in a controlled manner. This protective layer is achieved by anodic oxidation. This is not, as is often thought, a layer being applied. In fact, the uppermost aluminium layer of the part to be anodised is transformed and an oxide is formed. This thin oxide layer can be created from 12 to 25 µm (microns) depending on the customer's requirements. It protects its aluminium part from corrosion as long as there is no surface damage caused by scratches or similar.

The German DIN 17611 recommends the designations listed in the aluminium data sheet O 4 published by the Gesamtverband der Aluminiumindustrie e.V., Düsseldorf.

DIN 17611 ( as of 11/2007) in connection with Aluminium data sheet O4 Designation according to EURAS Standard

EV1natural colourC-0colourless
EV2nickel silver lightC-31light bronze
EV3goldC-32bright bronze
EV4bronze mediumC-33medium bronze
EV5bronze darkC-34dark bronze
The Anodising Process 1. Mechanical pre-treatment sanding, brushing, sand blasting and polishing 6. Anodisation Unprocessed aluminium Al 2 O 3 Pores in the oxide layer Print into the open pores Sealed anodised protective layer Oxide protective layer 2. Chemical pre-treatment de-greasing and pickling 3. Water rinse 5. Water rinse 7. Water rinse 9. Water rinse 8. Dyeing mostly at high temperatures 10. Finish Sealing 4. Shine polishing (optional)

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