Acid-Proofing of Wood

The use of wood in chemical industries is being maintained by improving its chemical resistance to destruction by acid and corrosive fumes by impregnating the wood with phenol-formaldehyde or bituminous resins. The phenolic resin impregnation method is the more expensive because of the cost of resin and the length of the kiln-drying and setting process. A proprietary bituminous impregnation process, using a special acid-resistant bituminous thermoplastic compound called Asidbar, manufactured by the Koppers Company, is less expensive. Pressure impregnation of wood with this material to approximately 50 percent of the weight of the wood imparts sufficient acid resistance to permit its use in tanks for storage of acids and acid salt solutions; ducts to exhaust acid vapors; drainage boxes for draining of acid waste solutions; platforms subject to acid spillage structural elements of plants subject to corrosive vapors; and filters for acid solutions. To determine whether wood, specially processed to resist chemical attack, is suitable for any given application, it is necessary to try samples of wood under the exact condition it will be exposed to.

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