Carboxylate-based Wood Preservatives

Copper naphthenate is an above-ground, oil-based wood/lumber preservative. It’s use and effectiveness has been known since the early 1900s. Lumber treated with copper naphthenate has a distinctive bright green color that weathers to light brown. Copper naphthenate is listed in AWPA Standards for treatment of major softwood species that are used for a variety of wood products.

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