This report is to present data obtained in an examination carried out on apile of incised and non-incised spruce poles in Delson, Quebec, on August 14, 1979. The examination was part of a study titled "Investigations of the Treating Characteristics and Performance under Subsequent Service of White Spruce Poles Preserved under Plant Conditions". The working plan (EFP-23-191) was prepared by J. Krzyzewski and J.K. Shields in 1977.
Treatment of spruce species with preservatives for poles and their field performance : investigations of the treating characteristics and performance under subsequent service of eastern spruce preserved under plant conditions
An ammoniacal copper arsenic preservative, copper-arsenic-additive (developed at the Eastern Forest Products Laboratory for difficult-to-penetrate wood species), was tested in a commercial treating plant using white spruce (Picea glauca [Moench] Voss) poles and lumber. The treatment schedule comprised steaming followed by a full-cell treatment. The ammoniacal solution, containing 3.2 percent oxides, was heated fro 46C (115F) to 66C (150F) during the first 3 hours of increased pressure (860 kPa; 125 pounds per square inch) then either left to cool for 10 hours or rapidly cooled with water for 3 hours.
An ammoniacal preservative, copper-zinc-arsenic-additive (developed at the Eastern Forest Products Laboratory for difficult-to-treat wood species), was tested in a commercial treating plant using poles, posts, and lumber of white spruce (Picea glauca [Moench] Voss). The treatment schedule comprised steaming for 5 hours followed by a standard full-cell treatment with a solution containing 2.2 percent oxides and 6 percent ammonia heated to 35C (95F). A pressure near 860 kPa (125 pounds per square inch) was maintained for 10-15 hours.
Two ammoniacal preservatives, copper-arsenic-additive (CCA) 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 (Pseudotsuga menziesii [Mirb.] Franco) plywood. The inner plies were spruce (Picea sp.) fir (Abies sp.), and hemlock (Tsuga sp.) - all can be difficult to penetrate with aqueous solutions. The treatment schedule comprised steaming for 1.5 or 2.75 h followed by a standard full-cell treatment for 1.5 or 4h (the longer schedule was used with CZAA). There was little strength loss due to treatment and no evidence of wood collapse. Cores taken from the center of the plywood faces showed: (1) the preservative had penetrated all 5 plies; (2) plywood treated with a 3.2 percent oxides solution of CAA retained 9.3 kg/m3 (0.58 pounds per cubic foot) oxides; and (3) plywood treated with a 2.2 percent oxides solution of CZAA retained 9.9 kg/m3 (0.62 pounds per cubic foot) oxides.