FLAKEBOARDS FROM RECYCLED CCA-TREATED SOUTHERN PINE LUMBER

Large volumes of nonbiodegradable preservative-treated demolition wood must be disposed of in the near and distant future. Landfilling prese nts long-term problems, and burning is not acceptable, except in certi fied incinerators, because combustion products contain toxic chemicals . Recycling of treated wood into flakeboards suitable for siding, shea thing, and flooring for high decay-hazard applications may be practica ble and a lower cost alternative to disposal in the environment. In th is study, flakeboards were made of ring-cut flakes from recycled south ern pine lumber that had been treated with chromated copper arsenate ( CCA). Flakes were bonded with a liquid phenol-formaldehyde resin. The preservative treatment lowered all property values substantially below those of untreated flakeboards. However, physical and mechanical prop erties of CCA-treated flakeboards were enhanced by spraying flakes wit h a 5 percent solids aqueous solution of hydroxymethylated resorcinol primer just before spraying and blending of the resin.