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Anodising is the surface treatment of aluminium profiles.

Aluminium foil

One of the most common surface-treatment methods, is used to create:

  • Permanent new appearance
  • Corrosion resistance
  • Dirt repellent surface that corresponds to a high standard of hygiene
  • Decorative surface with durable paint and lustre
  • Smooth surface
  • Functional surface, a sliding face or an abrasion-proof surface, for machine parts, for example
  • Electric insulating surface
  • Basis for application of glue and paint

The most common form of anodizing is natural anodizing. Hydro also delivers profiles with oxide layer impregnated with colour pigment. These include pigments with excellent colour fastness, suitable for outdoor use. Anodising produces a decorative, soil-repellent, corrosion-resistant surface. The surface of the metal is transformed into oxide through electrolysis. the process continues until the thickness of the oxide layer is the desired thickness – usually 5–20 µm.

  • Anodised - this includes a range of anodizing thickness and colours depending on application from decorative trim to more demanding application requiring a thick abrasion resistant film. This process is carried out at our in-house anodising facilities in Cheltenham.
  • Painted - a range of painted finishes are offered including wet painted, electrophorectic and powder coated. Again the choice of finish will depend on the application, colour requirements and volumes, particularly for electrophorectic where the economies require higher quantities.



Introducing SapaLok


Lock in colour
Lock in durability
Lock in longevity

A particular benefit of the SapaLok process is a highly durable surface coating, with no risk of chalking. SapaLok also offers enhanced corrosion resistance combined with high UV stability to ensure colours do not fade.

Our technical staff can advise on the appropriate and most effective finishing requirement on request.