treatment types


Business Update: Effective December 2021 the current sole supplier of pentachlorophenol (“penta”) will cease production of the preservative. At present no other long-term supplier of the penta preservatives exists. As a result, Koppers plans to discontinue the treatment of penta utility poles by early 2022. Koppers has multiple other preservative systems with proven results that will take the place of penta-treated poles.


Ask most linemen and they’ll claim that penta-treated poles are among the most flexible and easiest to climb. Our DuraPine® Penta poles are no different. When the need arises, linemen can quickly attach gaffs and climb without delay. A favorite for over 60 years, Penta provides a strong combination of performance, durability and safety.

Penta is an oil-borne preservative, which penetrates all treatable wood species effectively, saving costs for utilities by enabling them to use local trees such as Southern Yellow Pine, Douglas fir and Western red cedar. Penta-treated wood is not considered to be a hazardous waste, so Penta poles can be reused and recycled in a number of ways.

Linemen and truck

Key Features

Excellent in Cold Weather - When climate conditions are cold the
oil-borne nature of our DuraPine Penta treatment makes poles far less susceptible to the effects of freezing temperature, including brittleness, checking, pole twist or breakage.

Non-Corrosive - DuraPine Penta treated poles are not corrosive to pole hardware.

Fire Resistance - Our DuraPine Penta treated poles display only minimal damage when exposed to grass or brush fire, and in many instances the poles self-extinguish after a fire.

Good Looking - The more natural brown, “tree-like” look of DuraPine Penta treated poles makes them an aesthetic favorite to consumers.

More Disposal Options - From recycling to energy recovery, DuraPine Penta treated poles can be disposed of in a multitude of ways depending on state law and proper permitting.