What does pressure treatment mean, and what are the benefits of this over dip-treated products?
The-Yorkshire-Timber-Co2024-01-31T12:50:13+00:00Our treatment regime is strictly monitored and varies from product to product and the species of timber we use in our manufacture, typically the process is:
1. Timbers are sawn and planed and cut to their exact length.
2. Timbers are then placed in the treatment tank / pressure vessel.
A negative vacuum of -1Bar is drawn down, and once the level is reached, it is held at that negative pressure for 15 minutes. This helps to open the cells of the timber.
3. The tank is then flooded with the CX8 solution and the tank is brought up to a positive pressure of +10Bar, once achieved it's held at this level for 40 minutes. This forces the CX8 treatment solution into the sap wood of the product. Please note, we only treat the sapwood and not the heartwood as the heartwood never accepts CX8 any solution.
4. The tank is drained and the negative pressure or vacuum is undertaken for a second time to withdraw any excess CX8 solution, this is passed back to the tank and reused in the next treatment cycle.
5. The timber are then left undercover to drain and dry.
6. The dried solution is locked into the cell structure of the timber component and cannot be washed or weather out.
How are pressure-treated timbers superior to dip-treated products?
Dip-treated timbers are only coated superficially and adhere to only the surface of the timber they are in contact with. There is no vacuum or pressure cycles and it’s a quick in/out and dried. Very limited protection is achieved and no protection against long term rot or decay is achieved.
