Treatability of refractory species with amine and amine/ammoniacal formulations of ACQ

• Published in: Forest products journal 2002-10, Vol.52 (10), p.37-42
• Main Authors: MORRIS, Paul I, MCFARLING, Shane M, ZAHORA, Andrew R
• Format: Article
• Language: English
• Subjects: Ammonia; Applied sciences; Copper; Degradation and preservation; Exact sciences and technology; Experiments; Forest products industry; Laboratories; Polymer industry, paints, wood; Preservatives; Retention; Statistical analysis; Temperature; Trees; Wood; Wood. Paper. Non wovens
• ISSN: 0015-7473; 2376-9637

This work was designed to quantify differences in preservative penetration of western US/Canadian tree species when treating with amine copper quat type D (ACQ-D) and a hybrid amine/ammoniacal copper quat formulation (ACQ-D+), at both ambient and heated temperatures. These results were compared to that obtained with chromated copper arsenate (CCA). Both ACQ formulations allowed for improved penetration and retention of treated wood beyond that obtainable with conventional CCA treatments, either through the addition of ammonia, the use of heat, or both. The heated ACQ formulations and ACQ-D+ at ambient proved to be more effective than ambient temperature CCA at penetrating all four species. The heated ACQ-D+ formulation gave the best results, with both Pacific silver fir and western hemlock meeting the American Wood Preservers' Association standard for ground contact. White spruce and Douglas-fir treated with heated ACQ-D+ met the penetration requirement of the Canadian Standards Association decking standard.