Services

Pressure impregnation.

About the service

Longer service life.

We offer professional timber impregnation, providing long-term protection against moisture, rot and wood-degrading microorganisms.

Impregnation is carried out in accordance with the British Standard BS8417, using the environmentally friendly wood preservative CELCURE C65, produced at the Koppers plant in Sweden. It contains no arsenic or chromium and is suitable for professional industrial treatment.

Our production process also complies with CTB quality certification requirements (CTB-B+ / industrial wood preservation control standard), which confirm control of the impregnation process, consistent quality and compliance with the European wood preservation industry's requirements.

We operate a German-made "Scholz" vacuum-pressure autoclave with full automation, ensuring a precise and consistently controlled impregnation process. This is essential so that every batch is treated to a consistent quality.

Chemistry

Celcure C65 from Koppers.

An environmentally friendly, water-based copper-quaternary wood preservative solution, free of arsenic and chromium. Produced at the Koppers plant in Sweden.

Composition

A water-based copper-quaternary protective solution. Free of arsenic and chromium, the most environmentally friendly preservative available for industrial treatment.

Application

Suitable for Use Classes UC1-UC4. Protects timber in both indoor and outdoor applications, including direct contact with the ground or fresh water.

Certification

Complies with the British national standard BS8417 and the CTB-B+ quality requirements. Treated timber takes on a soft green colour that remains visible for a long time.

Impregnation classes

We perform Use Class 3 and Use Class 4 treatment.

The class defines where the timber can be used and how deeply the impregnation solution has penetrated the wood.

Use Class 3

For above-ground structures

For above-ground structures - dry or partially damp environments.
Decking, canopies, frames and roof structures.
Service life in damp environments 5-10 years (depending on conditions).

Use Class 4

In direct contact with water and soil

In direct contact with water and soil - very damp and aggressive environments.
Fence posts, bank reinforcements, supports.
Service life up to 20 years (depending on conditions).

Spruce and pine

Pine absorbs deeper, spruce stays at the surface.

The wood structure of spruce and pine differs, so the impregnation result is not the same.

Pine vs spruce

Pine absorbs the preservative through the full sapwood band, right down to the heartwood. Spruce - a maximum of 2-5 mm deep. Post service life differs accordingly.

Dried pine

Pine posts dried to 28% moisture absorb the preservative through the full sapwood band, right up to the heartwood.

Undried pine or spruce

Undried pine posts - only a shallow sapwood band. Spruce, even when dried - max. 5 mm.

Animation

Koppers treatment cycle.

The official Koppers animation of the CELCURE C65 vacuum-pressure process.

Process description

Six steps.

A standardised vacuum-pressure process in the autoclave. Fully automated.

01
Preparation
Prepared timber is loaded onto trolleys in a way that lets the impregnation working solution reach every piece freely.
02
Loading the autoclave
The trolleys are drawn into the autoclave via a chain system. This step is automated. Once the trolleys are inside, the autoclave lid is closed and sealed by a hydraulic mechanism.
03
Vacuum 1
The first step of the impregnation cycle is the initial vacuum. Air is pumped out of the autoclave; at the same time, air and excess moisture are drawn out of the surface pores of the timber. The vacuum phase is maintained for a set period.
04
Fill
After the vacuum phase ends, the impregnation working solution is fed in by gravity from the reservoir located beneath the autoclave.
05
Pressure
Once the autoclave is fully filled with the impregnation working solution, the pressure phase begins with a maximum pressure of 12 atm (bar). The pressure phase is held for a set period (0.5-2 h) depending on the specific treatment class. The whole process runs automatically.
06
Vacuum 2
After the pressure phase ends, the impregnation working solution flows back by gravity to the storage reservoir. Once the autoclave is fully drained, the final vacuum phase begins, lasting about 15-30 min. The final vacuum draws excess liquid off the surface of the timber.