Aluminium surfaces
| Description | Surface appearance | Application | |
| E0 | No pre-treatment, anodised and sealed | Drawing marks, scratches, grinding marks and other surface defects remain visible | Lower-level surfaces that are not in the field of vision |
| E1 | Ground, anodised and sealed | Even, matt surface, small drawing marks or scratches are rectified | Decorative surfaces with a clearly levelled structure |
| E2 | Brushed, anodised and sealed | Even, light surface, drawing marks, scratches, file strokes only partially removed | Shiny matt surfaces with soft structure |
| E3 | Polished, anodised and sealed | Shiny surface, drawing marks, scratches, file strokes are partially removed | Application preferably in the interior, easy to look after, suitable for all colours |
| E6 | Chemically pre-treated, anodised and sealed | Matt, rough surface. Drawing marks, scratches, file marks partially levelled out. Material-related changes to the surface appearance are not always avoidable. | Inexpensive, primarily suitable for dark shades |
| Standard process | Shade | Layers | Standard |
| E6/C-0 (EV1) | Colourless, natural | 5 -20µm | EURAS standard |
| E6/C-31 | Slightly bronze | 5 -20µm | EURAS standard |
| E6/C-32 (EV3) | Light bronze | 5 -20µm | EURAS standard |
| E6/C-33 | Mid bronze | 5 -20µm | EURAS standard |
| E6/C-34 | Dark bronze | 5 -20µm | EURAS standard |
| E6/C-35 (EV6) | Black | 5 -20µm | EURAS standard |
Anodising aluminium
Anodic oxidation or eloxal results in a tight, hard oxide layer on the metal surface that is firmly joined to the base material.
In addition, the oxide layer can be coloured so decorative effect is increased.
The electrolytic process means that a large number of different shades can be attained.
It provides protection against mechanical influences and is weather-proof and corrosion-resistant. The metallic shine of the material is retained.
Anodised aluminium can easily be recovered for reprocessing, and thus represents an environmentally friendly form of surface treatment.
Anodised surfaces: according to DIN 17611 – 17612
Anodised colours
| Standard colour | Designation |
| Natural | E6/ EV 1 |
| Mid bronze | E6/ C 33 |
| Dark bronze | E6/ C 34 |
Powder coating of aluminium
Powder coating is a process in which electrostatically charged powder is sprayed onto electrically earthed parts using compressed air.
The powder is liquefied in the melting process. This produces a closed plastic film that is characterised by a high level of resistance against environmental influences and mechanical stress.
Pre-treatment of the aluminium profiles is the essential condition for a long-lasting, high-quality coating.
The preferred method for this is chromating according to DIN 50939.
This pre-treatment is required to attain perfect adhesion of the coating on the substrate (aluminium) and also helps protect against corrosion.
Electrostatic powder coating is an environmentally friendly method, as it marks on solvents with a high level of effectiveness.
Powder-coated surfaces, e.g.:
Shade according to RAL 9016
Polyester-based powder coating in the electrostatic powder coating process, applied with a coating thickness of at least 70 microns.
Pre-treatment according to DIN 50939.
Firing temperature: 180° to 220° C.
Gloss level at least 60%.
Powder coating:
Standard colour white, RAL 9016