Corten Panels Corten Steel, also known as weather resistant steel, is a steel alloy made of iron which has copper, silicon, nickel and chromium added. As soon as Corten Steel is exposed to the elements it will naturally weather and develop a protective layer of rust, this can take several months. This natural fixed coating of rust provides protection against further corrosion. Characteristic of Corten Steel is the orange brown rust colour and its longevity. Important:а Corten steel products are delivered un-rustedа The products must be unpacked immediately after delivery so any moisture between the packaging and the product is not sealed.а Advantages: Very strong, wear-resistant and durableа Low-maintenanceа Weatherproof and durable materialа Warm and natural appearanceа We only use Corten Steel category A type S355JOWPа We recommend СOwatrolТ varnish which will stop the planter from rusting any further (available from us)а 5 year warranty Extras: Varnish Rust accelerator Corten post (for assembly)