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We rely on state-of-the-art impregnation processes for vacuum-pressure treatment. This allows us to offer a maximum wood life expectancy of 15 up to 80 years and to secure the development of critical infrastructure worldwide.
As a leading European manufacturer, induo® uses exclusively impregnation processes with proven maximum effectiveness for wood protection. Our wooden poles are subjected to a precise pressure impregnation process in modern impregnation plants.
Depending on the technical specification and the requirements of the target market, we offer standard-compliant creosote impregnation using the Rüping process (creosote WEI Type B in accordance with EN 13991) or environmentally friendly salt impregnation based on chromium-free copper salts - such as Tanalith, Wolmanit, Korasit or Impralit. This ensures complete penetration of the sapwood zone of the pine wood.
For over 100 years, creosote impregnation has remained the unrivalled solution for telecommunications and power networks in many climatically demanding markets worldwide. The technology we use - the Rüping process - prevents the poles from bleeding afterwards during storage and ensures an absolutely uniform impregnation of the wood.
We press hot creosote oil at a controlled temperature of approx. 105 °C to 140 °C under high pressure directly into the wood cells. The impregnation is carried out after a precise application of initial air pressure (100-700 kPa), which optimally saturates the wood.
We guarantee a reliable preservative retention of at least 95 to 140 kg per cubic metre of wood.
We use the certified quality oil of the classic Type B, which is generally specified and preferred for infrastructure projects in countries outside the European Union (EU).
For projects that require high environmental compatibility - in European low- and medium-voltage networks, in telecommunications networks or in the agricultural sector - we use certified aqueous solutions of copper salts in concentrations of 3% to 6%.
Immediately afterwards, the impregnated wood undergoes a controlled fixation process, through which the preservative is permanently anchored in the wood in a leach-resistant manner.
Copper-triazole technology, proven on the market for over 20 years.
Wood-preservative salt based on Cu-HDO - chromium-, boron- and arsenic-free, with excellent plant compatibility.
Copper complexes and quaternary ammonium compounds - protection against fungi, insects and termites.
Chromium-free, boric-acid-based wood preservative - preventive protection against wood-destroying insects, decay fungi and soft rot.
A clear, technical parameter table, readable for planning departments.
| Criterion | Creosote impregnation WEI Type B | Salt impregnation (Tanalith, Wolmanit, Korasit) |
|---|---|---|
| Substances used | Impregnation oil in accordance with EN 13991 | Chromium-free copper salts |
| Protective effect | Decay, micro-organisms, termites, cracking | Fungi, insects, termites |
| Colouring of the pole | Dark brown to black | Light green (patinates to grey over time) |
| Recommended markets | UK, Ireland, Middle East, Africa | EU region, telecommunications near residential areas, power supply, agriculture |
| Service life in the ground | approx. 15-80 years | approx. 8 to 25 years (significantly extendable with LoPro® wood-protection bandages) |
Are you planning an overhead line project and wondering which preservative is best suited to the particularities of your market, the soil climate and local standards? Configure your preliminary timber parameters now - our engineers will help you select the best protection system, from robust creosote impregnation through environmentally friendly salt impregnation to our highly effective LoPro® wood-protection bandages.
Do you have another question? Contact our team.
Effective and durable pressure impregnation can take place only in the sapwood layer of the tree. The central and northern European pine that we carefully select is naturally distinguished by a particularly wide and uniform sapwood zone, which enables deep and complete absorption of the preservative.
Spruce wood, by contrast, has a completely different cell structure. Among specialists it is regarded as resistant to impregnation, since it physically cannot absorb the preservative deeply enough. This makes pine the qualitatively superior choice for long-term ground installation.
The traditional full-cell process (also known as the Bethell process) first creates a vacuum that draws the air completely out of the wood cells. As a result, the cells then fill completely with the preservative.
In the technologically leading Rüping process - a so-called empty-cell process - we begin by using controlled air overpressure to compress the air within the cells. Only afterwards is the creosote oil introduced. Once the pressure process is complete, the trapped air expands again and gently forces the excess oil out of the cell cavities.
The result: our wooden poles receive maximum deep protection within the cell walls, while the cavities remain empty. This means the poles are optimally preserved, yet do not tend to bleed or drip during transport or storage.
All chemically treated wooden poles must, at the end of their life cycle - which spans several decades - be sent for proper thermal recovery (energy recovery).
This means that the poles are safely disposed of in accordance with statutory environmental regulations in approved industrial or biomass power plants equipped with modern flue-gas cleaning, and used for clean power and heat generation.
