Wood Preservatives

There are four general types of wood preservatives: standard creosote and creosote-coal tar; inorganic water soluble salts; organic oil soluble materials; and miscellaneous preservatives, such as organic resins that increase hardness, dimensional stability, and resistance of wood to acids and abrasion. Creosote is used under the severest conditions. It is dark brown, oily, and odorous and is used to preserve poles, piles, ties, bridges, and platforms. Waterborne inorganic salts, such as zinc chloride and Wolman Salts, are clean, odorless, and paintable, but leaching is a limiting factor. Salts such as chromated zinc chloride, Minalith, and Protexol are fire retardants. Oil soluble preservatives include copper naphthenate and pentachlorophenol, both of which are clean and paintable, and are used in the sash, door, and millwork industries.

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