These treatments are often referred to by trade names such as: Wolmanized Natural Select™ (Copper Azole), Preserve and Nature Wood® (ACQ), Micro Pro™, Smart Sense™ (MCQ), and Advance Guard® (Borate).Each preservative usually has a number of variations available so care should be exercised when specifying treated wood.Some different oil-borne preservatives that are used are Chlorpyrifos/IBPC, Copper Naphthenate and Pentachlorphenol.
Retention level refers to the amount of preservative that remains in the wood after the treatment process is complete.
It is measured on a weight basis and is typically expressed as pounds of preservative per cubic foot (pcf) of wood.
There are a number of typical retention levels available.
Pressure treatment is a process that forces chemical preservatives into the wood.
Wood is placed inside a closed cylinder, then vacuum and pressure are applied to force the preservatives into the wood.
The preservatives help protect the wood from attack by termites, other insects, and fungal decay.
Waterborne, Creosote, and Oil-borne (penta) are the three broad classes of preservatives typically used when pressure-treating wood.
Wood treated with waterborne preservatives is typically used in residential, commercial and industrial building structures.
Creosote is primarily used for treating railroad ties, guardrail posts, and timbers used in marine structures.
Oil-borne (penta) is most often used for treating utility poles and cross arms.
Several typical waterborne preservatives used in building applications include: Chromated Copper Arsenate (CCA-C), Alkaline Copper Quat (ACQ-C, ACQ-D, ACQ-D Carbonate), Micronized Copper Quat (MCQ), Copper Azole (CA-B & CA-C, μCA-C) and Sodium Borates (SBX/DOT).