Cor-Ten is a solid steel that has a natural, rugged patina that ages continuously in a unique way. When used correctly it is expressive, long-lasting and maintenance-free. It is also 100% recyclable. 
Cor-Ten is almost pure steel, alloyed only slightly to form a protective layer of patina when exposed to weather. The patina layer is initially reddish brown in colour, becoming darker in tone over the course of time. In industrial and aggressive environments, the patina forms more rapidly on the steel and darkens more than in cleaner rural environments. The protective patina layer cannot form, however, if the surface of the steel is continuously damp or dirty. 

There are different grades of Cor-Ten available on the market and it’s important to use correct grade for façade applications. Moreover, it is important to understand Cor-Ten behavior in all interfaces to avoid accelerated corrosion, which can lead to significantly shorter life span. To ensure long lasting Cor-Ten façade, we always use Cor-Ten material thickness 1.0 mm or thicker.

Cor-Ten products are delivered un-patinated and the oxidation process starts immediately when exposed to weather. To speed up the process Cor-Ten surface may be washed with water and mild detergent, but finally it is the environmental conditions that are in charge of the process.
Check above animation on COR-TEN® patina formation process.
We in Ruukki have been delivering Cor-Ten facades for over 25 years and are able to help you to design and build a long lasting high quality Cor-Ten façade.

Materials

Surface treatment Material thickness (mm) Corrosivity category UV resistance Minimum order amount (m2)
Patinated (no coating) 1.0, 1.5 C4 n/a No limits

 

Material thickness 1.5 mm is used in Liberta & lamella products and 1.0 mm in design profiles.

UV resistance describes how well the coating is able to keep its original colour and gloss levels in accordance with EN10169. The higher the class, the better the resistance.

Corrosivity categories describe the outdoor climate conditions in accordance with EN12944. The higher the category, the more corrosive environment.

Read more about UV-resistance and corrosivity categories.

Cor-ten finishes

cor-ten

Cor-ten in use

Facade cladding products available in Cor-Ten

PRODUCT DESCRIPTION
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Design Cor-Ten S7

  • Effective width: 1119 mm
  • Length: 200 - 3550 mm
  • Depth: 6 mm
  • Fasteners: visible

Ruukki® emotion
Available also with perforation and backlighting.

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Cladding Lamella Cor-Ten 20

  • Effective height: 150 - 600 mm
  • Width: 150 - 3000 mm
  • Depth: 40 mm
  • Fasteners: concealed

Ruukki® emotion
Available also with perforation and backlighting.

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Cladding Lamella Cor-Ten 30

  • Effective height: 150 - 600 mm
  • Width: 150 - 3000 mm
  • Depth: 40 mm
  • Fasteners: visible

Ruukki® emotion
Available also with perforation and backlighting.

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Liberta Cor-Ten 600

  • Width: 100 - 3000 mm
  • Height: 100 - 1000 mm
  • Depth: 30 mm
  • Fasteners: visible

Ruukki® emotion
Available also with perforation and backlighting.

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Liberta Cor-Ten 700

  • Width: 100 - 1000 mm
  • Height: 100 - 3000 mm
  • Depth: 30 mm
  • Fasteners: visible

Ruukki® emotion
Available also with perforation and backlighting.

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Liberta Cor-Ten 800

  • Width: 200 - 1000 mm
  • Height: 200 - 3000 mm
  • Depth: 40 mm
  • Fasteners: concealed

Ruukki® emotion
Available also with perforation and backlighting.

Contact us

Other materials

Colour-coated

Colour-coated metal facade products are a durable way to use colours in all sizes of monotone surfaces and colour compositions.

Rheinzink

Patinated Rheinzink has an aesthetically soft, matt surface that gives a very natural impression. The patina changes very little over time.

Glass

Glass creates a high gloss and durable flat surface for the facade.

Aluminium

Brushed design aluminium produces a brushed, directional shine combined with the high gloss of a varnish layer.

Pattern-painted aluminium

The painted pattern on the metal sheet makes the surface livelier when observed at very close proximity. 

Copper, Brass, Bronze

Patina forming on the wall and various pre-patina options give these solid metals a live, genuine surface for very long time spans.

Stainless steel

Stainless steel maintains its shine and appearance very well and, as a solid material, it is very easy to maintain.