Corten steel Spiral Planter
Corten steel is a very weather proof steel. It is visually indistinguishable from structural steel. Corten steel forms a protective layer after the initial weathering process, which protects the material from further degradation. Additionally, corten steel contains a small amount of copper (less than 1%), which acts as a natural slug repellant!
The copper oxides when it comes in contact with slug trails, preven6ng slugs from journeying further.
When we ship the cortex steel Spiral Planter it will be silver coloured, but the rust layer will form with time (see rust process).
Corten steel is one of the most durable materials. The durability is about 8 times that of normal steel. The protective rust layer is created through changes in humidity, and will provide protection against further rusting.
After the protective layer has been formed, the material does not need to be treated further.
Corten steel is 100% recyclable. Scrap metal collection points gladly accept the material and often pay for it.
- 4Rust process:
There are two ways to create the rust layer:
1. Use a rust accelerator (recommended)
You may be able to find specialised fast rusting solutions in specialised shops. However we have seen very good results using a diluted salt solution (mixture of 50 Salt to one liter water). After assembling the Spiral Planter without soil, then cleaning the oil layer with washing up liquid and water, spray this salt solution onto the Spiral Planter daily. The rust layer should form after 7-10 days*. The Spiral Planter can be filled with soil and sowed after the completion of the treatment.
2. Without using a rust accelerator
In the second method time and natural weathering cause the rusting process. The individual parts of the Spiral Planter are cleaned with washing up liquid and water to remove the oily top layer, then assembled, and filled with soil and planted. Without further treatment, the rust layer will form within 8-12 months* through the weather-related changes in humidity.
*= The duration, colour and speed of the rusting process will depend on the weather conditions and the location of the Spiral Planter.