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Opal anodising

Opal anodising is an anodising method developed by PGE, formerly Philips, which was continued by Aldor in 2008. Previously, this process was known as opal anodising. Opal anodising is not comparable to common anodising methods such as normal and hard anodising.

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Opal anodising is a process that results in a very smooth anodised layer with a >80% ingrowth into the aluminium so that the process is dimensionally stable. The layer is highly scratch- and wear-resistant, opaque and extremely smooth. The name opal anodising is explained by the ceramic, opal-like appearance of the layer.

Opal anodising layers can be applied ranging from a few microns to around 25 microns thick. It is not possible to opal anodise every aluminium alloy, only a few alloys qualify for this. If you want to opal anodise a product, please contact Aldor BV in advance.

Because of the very small pores, it is almost impossible to colour an opal anodised layer.

Applications

The applications are numerous because of the special layer properties in terms of scratch and abrasion resistance, smoothness, possibility of application in a vacuum and low reflection of - and high resistance to - UV radiation.

  • Air bearings

  • Pistons

  • Noiseless gears

  • Works requiring very high corrosion resistance (e.g. against hydrofluoric acid)

  • Part wear shafts

  • Working parts that require high specific impact resistance

  • Loss forms

  • High dimensional accuracy vacuum ducts