Understanding the
Wood Preservative Treatment Process

In general, all wood preservative treatment provides some level of protection from fungal and insect infestation. But not all wood preservative treatment provide the same level of protection. Normally, there a two methods of applying this treatment;

• Surface application by brush, spray or immersion
• Under pressure in a controlled environment.

Surface coating however, does not provide the long term protection given by applying preservative under pressure deep into the body of the wood.

Understanding the pressurised TANALITH® E wood preservative treatment process

TANALITH® E is an eco-friendly wood preservative treatment available worldwide. The unreated timber is loaded into a large treatment vessel which is then sealed. A vacuum is applied and maintained, removing the air not only from the vessel itself but also from within the cells of the timber.

The vessel is now flooded under vacuum with TANALITH® E wood preservative and pressurised hydraulically.

This pressure forces the preservative deep into the heartwood/sapwood of the timber. The depth of penetration depends on the species and several other factors.

The vessel is now evacuated once again to remove any excess preservative solution which is returned back to the storage tank. When the vessel is finally vented to atmosphere, the existing low pressure within the timber draws in the surface solution even deeper into the timber. The wood preservative treatment process is now complete and the newly treated timber is left to dry.