Copper surfaces

The natural development of copper patina is one of copper’s unique characteristics. Within a few days of exposure to the atmosphere, the surface of Nordic Standard copper begins to oxidize, changing its color from the “bright” mill finish to a chestnut brown which gradually darkens over several years to a chocolate brown. Continued weathering can then result in development of the distinctive green patina – or blue in coastal locations. The patina film provides impressive protection against corrosion and can repair itself if damaged, defining the exceptional longevity of copper cladding.

Nordic Copper

Over the last few decades, Aurubis has developed a range of factory-applied surface treatments to provide the various stages of oxidation and patination straightaway. The processes involved are very similar to those taking place over time in the environment and utilize copper mineral compounds, not invasive chemical treatments.

Aurubis’ products for architectural applications use phosphorus deoxidized copper, designated Cu-DHP and complying with EN 1172:2011 – “Copper and Copper Alloys: Sheet and Strip for Building Purposes”. This pure and natural material exhibits a unique range of characteristics and performance benefits.

Nordic Surfaces are supplied with a protective sheet on the finished face.

Aurubis works closely with architects in developing special individual levels of patination of Nordic Surfaces, custom-made surfaces and other techniques in order to meet their design requirements or to match histori­cally patinated copper on existing buildings. Therefore, the early involvement in the architectural design process is essential.

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Nordic Standard

Nordic Standard is mill finish copper without any additional surface treatments carried out in the factory. It has the traditional “bright” finish that develops and changes in the environment, as described earlier.