Industrial Trials with Ammoniacal Preservatives. III. Copper-Arsenic-Additive and Copper-Zinc-Arsenic-Additive with Douglas-Fir Plywood

摘要

Two ammoniacal preservatives, copper-arsenic-additive (CAA) and copper-zinc-arsenic-additive (CZAA) - developed at the Eastern Forest Products Laboratory for difficult-to-penetrate wood species - were tested in a commercial treating plant on Douglas-fir plywood. The treatment schedule comprised steaming for 1.5 or 2.75 h followed by a standard full-cell treatment for 1.5 or 4 h. There was little strength loss due to treatment and no evidence of wood collapse.