Certificates & standards

Treatment standard

Untreated wood fiber is a food source for fungi, bacteria and insects.
By treating timber with a chemical preservative the wood fiber is eliminated as a potential food source. And this means no organically caused destruction like rot or decay.
Pressure treating is a process of forcing preservatives deeper into the wood fiber of timber.
Pressure treated wood lasts longer because it is more resistible to rot and decay.

The timber is placed inside a pressure tank. An initial vacuum is applied to open up the structure of the cells to allow better penetration. After the tank is fully filled with the chemical solution a pressure of over 12 Bar is applied which forces the fluid deep inside the wood from all sides ensuring a sealed layer of protection.

AKZ Ltd operates a treatment plant with two pressure tubes. The chemical solution used is ACQ, which is approved for usage around the world.
ACQ is a copper based preservative for timber for internal and external applications of both ‘ground contact’ and ‘above ground’ usage.
Two different colored chemicals are used: ACQ green and ACQ brown.

ACQ green treated timber will initially have an even green appearance. In time this will weather to a natural light brown color. If exposed to the sun for a prolonged period of time the color will fade to light grey.
This color fading does not influence the effectiveness of the chemical protection.

AKZ Ltd pressure treats wood for a various range of end usages. According to the final application the material can be treated to Hazard Class 2, Hazard Class 3 or Hazard Class 4.