Which chemical is commonly used in pole preservatives?

Copper naphthenate is commonly used in pole preservatives due to its effectiveness as a wood preservative and its ability to protect against decay and insect damage. This chemical works by penetrating deep into the wood, which helps to extend the life of wooden utility poles. Its antimicrobial properties combat fungi and other biological threats, making it ideal for outdoor applications where wood is susceptible to harsh environmental conditions.

The usage of copper naphthenate is favored over other chemicals because it balances efficacy with environmental considerations, ensuring that treated poles are safe for nearby flora and fauna. Additionally, its relatively low toxicity compared to other preservatives makes it a preferred choice in many jurisdictions. Other options listed may not provide the same level of protection or suitability for treating wood in utility applications.