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Alternatives to chromated copper arsenate for residential constructionAuthor(s): Stan T. Lebow
Source: Res. Pap. FPL-RP-618. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2004. 9 pages
Publication Series: Research Paper (RP)
Station: Forest Products Laboratory
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DescriptionFor decades chromated copper arsenate (CCA) was the primary preservative for treated wood used in residential construction. However, recent label changes submitted by CCA registrants will withdraw CCA from most residential applications. This action has increased interest in arsenic free preservative systems that have been standardized by the American Wood Preservers' Association. These include acid copper chromate (ACC), alkaline copper quat (ACQ), copper azole (CBA-A and CA-B), copper citrate (CC), copper dimethyldithio-carbamate (CDDC), and copper HDO (CX-A). All of these CCA alternatives rely on copper as their primary biocide, although some have co-biocides to help prevent attack by copper-tolerant fungi. These alternative treatments have appearance and handling properties similar to those of CCA and are likely to be readily accepted by consumers. Prior studies indicate that these treatments release preservative components into the environment at a rate greater than or equal to that of CCA, but because their components have lower mammalian toxicity they are less likely to cause concern in residential applications. As the treated wood industry evolves, it is probable that a wider range of types and retentions of wood preservatives will become available, with the treatment more closely tailored to a specific type of construction application.
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CitationLebow, Stan T. 2004. Alternatives to chromated copper arsenate for residential construction. Res. Pap. FPL-RP-618. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2004. 9 pages
KeywordsChromated copper arsenate (CCA), alternative preservatives, leaching, environmental concerns
- Alternatives to chromated copper arsenate (CCA) for residential construction.
- Copper tolerance of brown-rot fungi : oxalic acid production in southern pine treated with arsenic-free preservatives
- Treated wood in transition : a look at CCA and the candidates to replace it
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