Aluminium windows and doors can be supplied in either an anodised or painted finish.
Anodising is an electro-chemical process where a natural oxide film is created by passing an electric current through a sulphuric acid solution with the aluminium extrusion acting as the anode. The anodised film created can be coloured using pigments, organic or inorganic dyes.
The thickness of the anodised coating can be varied by the processing time. The thickness of anodising for doors and windows is usually between 15 and 25 microns.
Paint is applied by either a liquid organic coating or by powder coating.