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Wood Preservation W H 10.1081-0-8247-0633-1-1200003843 Wood Preservation W H. Michael Barnes Forest Products Laboratory, Forestry and Wildlife Research Center, Mississippi State University, Mississippi State, Mississippi, U.S.A. INTRODUCTION chlorophenol, and the waterborne arsenicals, primarily chromated copper arsenate (CCA). These three systems The history of wood preservation dates to 2000 B.C.E. have been designated Restricted Use Pesticides by the when natural oils and other materials were used to United States Environmental Protection Agency (US preserve wood. Modern industrial timber preservation EPA), but wood scraps and discarded components that can be traced to John Bethell in England, who developed a have been treated with these preservatives are not listed as process for pressure treating ship timbers with creosote in hazardous wastes. The major concern with the disposal of 1838 (1). Today, wood preservation accomplishes two treated wood is the lack of sanitary landfill space to main tasks. First, it allows us to conserve timber. Experts accommodate a large volume of treated wood. estimate that the failure to control wood-destroying insects Creosote is a broad-spectrum biocide composed of a and fungi in the United States alone requires the additional complex mixture of chemicals containing polyaromatic cutting of 360,000 acres of forests yearly. Secondly, wood hydrocarbons, which can have immediate and chronic ef- preservation allows us to increase the service life of wood. fects on exposed organisms. Fortunately, creosote is easily Treatment of wood affords protection from the principal broken down in the environment and can be readily disposed agents of wood deterioration—fungi, wood-destroying of by high-temperature incineration. While creosote is an insects (primarily termites), marine borers, fire, and oil, it is often diluted with heavy oil or coal tar for use. It is weathering. A better understanding of the causal agents primarily used to treat pilings or piles, poles, and crossties of wood deterioration will help the scientific community (sleepers). design more effective systems for protecting wood while Pentachlorophenol is a broad-spectrum biocide that is minimizing environmental impact and improving service dissolved in organic solvents (often fuel oil). It is of life. An excellent discussion of causal agents can be found concern because of its toxicity to aquatic organisms. It is in a recently published treatise (2). banned in several countries and is strictly controlled in the In recent years, two principal factors have spurred United States. Pentachlorophenol is used primarily for changes in treatment technology and preservative systems treatment of crossarms and treatment of poles not exposed worldwide: 1) environmental concerns, including air and in tidal areas. Wood treated with pentachlorophenol can water quality standards, and the effect of treated wood on also be disposed of by high-temperature incineration. man and nontarget organisms; and 2) the energy crisis, The arsenic and/or chromium in CCA and other especially in regard to oil and oil-based preservative sys- waterborne systems can result in toxic reactions in aquatic tems. Of these two, environmental concerns predominate. organisms and pose an additional hazard because of their cumulative effect. Fortunately, such systems are well bound within the wood structure once it has been dried and fixed following treatment. A recent study showed CLASSICAL WOOD PRESERVATIVES that, while there were measurable biocide increases in the water column and sediment around treated wood in a Wood preservatives should be safe to handle and use, ef- wetland boardwalk, no taxa were excluded or signific- ficacious, cost-effective, permanent, and should not cor- antly reduced near treated wood structures (3). Water- rode metal or degrade wood components. Worldwide, the borne arsenicals are the primary preservatives used to major preservative systems are creosote, oilborne penta- treat lumber and timbers. Encyclopedia of Pest Management 1 Copyright D 2002 by Marcel Dekker, Inc. All rights reserved. 2 Wood Preservation NEW GENERATION WOOD reduced, posttreatment dripping. Rapid in situ fixation PRESERVATIVE SYSTEMS schemes with chromium and arsenic-containing preserva- tives generally use hot air heating, hot water fixation, Heavy metals like chromium and arsenic have undergone steam fixation, or hot oil heating. The key factors close environmental scrutiny spurring efforts to replace or affecting fixation are wood moisture content, temperature, reduce their use in waterborne systems. This has led to the concentration, and time. Since the fixation reactions are development and introduction of several new copper-based essentially ionic, moist wood is essential to proper rapid preservative systems into the worldwide market. These fixation (5). include copper-quaternary ammonium, chromated copper Novel treating processes being developed may lead to borate, copper azole, copper dimethyldithiocarbamate, bis- improved treated products having reduced environmental (N-cyclohexyldiazeniumdioxy)-copper, and copper citrate impact. Among the emerging technologies are sonic treat- systems for above ground and ground contact applications. ment, gas/vapor-phase treatment, and super-critical fluid The biocidal properties of borate compounds have long treatment. Of these, vapor-phase treatment using boron to been used in Australasia and are coming into wider use in treat composite materials is the closest to commercial use. North America for wood exposed in protected, nonleach- Detailed guidelines for Best Management Practices ing environments, especially in areas threatened by the have been issued for all major commercial wood pre- introduced Formosan subterranean termite. Borate for- servatives in the United States (7). Use of these guidelines mulations are being used in remedial treatment systems has been shown to reduce the impact of preservatives on and zinc borate is being used for the protection of the environment. Consumer Information Sheets have been composite wood products. Borate-treated house framing issued for all wood preservatives to guide users in the components have been available in Hawaii for several proper use and handling of treated wood (7). years and now are available on the U.S. mainland. New generation oilborne systems have also come to the fore in recent years. Many, such as substituted isothiazo- lones, chlorothalonil, thiazoles, carbamates, and triazoles, MANAGEMENT AND CONTROL OF are under development or are in use as a component in PRESERVATIVE SYSTEMS multiple component preservative systems. Others, such as oxine copper and copper naphthenate, are re-emerging as In the Unites States, preservative systems are managed and commercial preservatives. Copper 8-Quinolinolate has controlled by the Environmental Protection Agency, under United States Food and Drug Administration (US FDA) the Federal Insecticide, Fungicide, and Rodenticide Act, approval for use in wood products in contact with food- and other governmental agencies through statutes stuffs (e.g., pallets) and is being used for preventing sap- designed to protect the environment. These long-standing stain and mold fungi in freshly sawn lumber, or for uses statutes provide for air and water quality standards, in aboveground exposures. Copper naphthenate in heavy discharge limits to the environment, certification, regis- oil carriers is finding use as a pole preservative and is tration, remediation, and penalties for noncompliance. not currently listed as a Restricted Use Pesticide by the In the European Union (EU), the Biocidal Product US EPA. Directive was implemented in May 2000. Under its guidelines, those active biocidal ingredients, which are approved or in use in any of the member countries, must TREATING PROCESSES be listed and categorized as either ‘‘Identified’’ or ‘‘Notified’’ substances by March 2002. If a substance is Commercial pressure treating processes have remained considered ‘‘Identified’’, its registration will be valid until largely unchanged since the early 1900s. Modifications to 2005 or 2006. For the case of a ‘‘Notified’’ substance, the standard practices include the modified full-cell data concerning human toxicity and its impact to envi- process and the addition of a posttreatment fixation cycle ronment must be provided by March 2002. In this case, with CCA preservatives. The modified full-cell cycle has and in the case of new biocide actives, full data, as been utilized to reduce the total solution injected into the required in the technical annex of the Biocidal Product wood while maintaining penetration and retention speci- Directive, must be provided for evaluation prior to ap- fications. The net benefit is to reduce the potential release proval for use. All wood preservative formulations will be of excess preservative solution into the environment (4– registered at the member state level through existing na- 6). Accelerated fixation cycles have improved compliance tional channels. It is intended that these registrations will with environmental regulations and eliminated, or greatly be mutually recognized throughout the EU member states. Wood Preservation 3 FUTURE CONSIDERATIONS ments, Vol. I Degradation and Protection of Wood, 1st Ed.; Nicholas, D.D., Ed.; Syracuse University Press: Syr- Many of the newer, more environmentally benign com- acuse, NY, 1973, 1–30. W pounds suffer from a lack of broad-spectrum activity 2. Eaton, R.A.; Hale, M.D.C. Wood: Decay, Pests, and needed for
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