Pre-treatment largely determines the finish (look) of the aluminium. Alucol offers the main pre- treatments. Multiple combinations of chemical and mechanical pre-treatment options are available. You can customise your own finish using our Configurator tool.

After pre-treatment, the aluminium is always anodised and (optionally) coloured.

Chemical Pre-treatment

The standard pre-treatment of raw aluminium is known as 'chemically etching’. This chemical pre-treatment removes any irregularities from the aluminium surface and gives a matte, smooth finish.
The die-lines resulting from the extrusion process cannot be completely removed using chemically etching.

Mechanical Pre-treatment

A variety of mechanical pre-treatment techniques can be applied together alongside, or instead of, chemical pre-treatment.


Grinding in combination with etching ensures a surface that is free from die- lines. This pre-treatment is usually applied in a high-end market.
Grinding can also be used as a finish and gives a rough ‘scratch mark’ structure.

Brushing / Cross Brushing

Brushing is mainly used to apply fine or slightly coarser scratch marks in the aluminium, giving an RVS-look (Inox) or cross look.


Polishing is applied to achieve a satin shine finish. Mirror-shine is not possible using polishing and anodising. The level of reflectiveness can be influenced by changing the thickness of the anodisation layer.


Alucol can apply mechanical pre-treatment to products with a maximum dimension of 7,000 x 1,200 mm [L x W].