Preservative application methods
Treatments can be applied by pressure impregnation, surface treatment, or integrated glueline addition
Pressure treatment
Description
· Wood is protected with chemicals in vacuum-pressure treating cylinders
· Pressure treatment is usually done at dedicated treatment facilities by wood treatment companies (treaters)
· High- and low-pressure cycles are selected to achieve targeted penetration of the wood with preservatives
Application
· Long-term protection (decks, utility poles, piling, railroad sleepers, fencing)
· Up to heavy duty applications (UC5)
Surface treatment
Description:
Dip
· Wood is immersed into a tank containing protection chemicals
· Penetration of chemicals into the wood is limited, resulting in an envelope of protection close to the wood surface
Spray
· Chemicals are spayed on the surface of the wood
· Penetration of chemicals into the wood is limited, resulting in an envelope of protection close to the wood surface
Application:
Dip
· For short- and long-term treatment
· Mostly chain of commerce and interior uses (up to exterior, coated applications (UC3))
· Penetration of chemicals into the wood is limited, resulting in an envelope of protection close to the wood surface
Spray
· For short- and long-term treatment
· Mostly chain of commerce and interior uses (up to exterior, coated applications (UC3))
Integrated treatment
Description
· Integrated treatment for engineered wood products
· Wood protection chemicals are combined with glue that is used in the production process of certain types of engineered wood
Application
Used against insects and decay fungi for Engineered Wood Products