PRESERVATIVE TREATMENT EVALUATION OF RED MAPLE AND YELLOW-POPLAR WITHACQ-B

This project sought to determine if there was a difference in treatmen t results of selected refractory hardwood species by comparing a heate d solution of ammoniacal copper quaternary compound-Type B (ACQ-B) to an ambient solution of ACQ-B using three pressure period durations. No minal 2-by-4 samples, 6 inches long, of red maple and yellow-poplar he artwood were end-sealed and vacuum/pressure treated with a I percent a ctive ingredient solution of ACQ-B. Duration of pressure was varied as well as temperature of solution. Measurements were taken of minimum a nd maximum penetration, percentage of cross-sectional area penetrated, and retention of preservative as determined by x-ray fluorescence spe ctroscopy analysis (ASOMA). Statistical analysis indicated improved pe netration into yellow-poplar heartwood when the preservative solution was heated. Red maple results were inconclusive in that there was diff iculty indifferentiating heartwood and confirming the refractory natur e of the species.