Durability Performance of Boron/Copper Naphthenate Dual-Treated Queensland Maple (Flindersia brayleyana)

Abstract The potential for using a disodium octaborate tetrahydrate and oil-borne copper naphthenate dual dip treatment to protect timber in aboveground exposures was assessed on Queensland maple ( Flindersia brayleyana ). Boron penetration was complete 2 weeks after treatment and boron levels continued to increase in the center of the samples over a 12-week diffusion period. The use of higher boron concentrations enhanced uptakes, but prolonged dipping times produced smaller gains in uptake. Preliminary results from field trials in an aboveground decay test suggest that the dual treatments are performing slightly better than boron alone, but the results are still early. Further assessments are planned.