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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Coatings Minimize Leaching From Treated Wood

Source: USDA Forest Service, Forest Products Laboratory, Techlines, 2001

Author(s): Olstad, adele

Publication Year: 2001  View PDF »

Category: TechLines

Abstract: Chromated copper arsenate (CCA) is a commercially applied preservative that is widely used to protect wood from attack by decay fungi and insects. CCA-treated wood is commonly sold at lumberyards as -green treated- wood. The target concentrations of chromium, copper, and arsenic in CCA-treated wood depend on its intended use. The most common CCA treatment retention, 6.4 kg/m3 (0.4 lb/ft3), is applied to wood intended for use in contact with the ground. Chromium, copper, and arsenic in CCA-treated wood are bonded to the wood through chemical reactions, but a small percentage of these elements gradually leaches out of the wood over time. People are sometimes concerned about this leaching when CCA-treated wood is used in playground equipment and decks. One way to reduce leaching and alleviate these concerns is by coating the treated wood.

Keywords: chromated copper arsenate, CCA, treated wood, coatings, leaching, techline

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