Copper borate was evaluated for use in protecting oriented strand board (OSB) from mould, decay, and termites. Aspen OSB bonded with either phenolic or isocyanate resin was treated with several formulations of copper borate at various loadings from 0.26 to 4 percent by weight. These panels were then tested to determine the impact of the preservative on mechanical properties as well as resistance to fungal decay, mould, and Formosan termite attack. With proper resin selection, acceptable panels could be produced with both phenolic and isocyanate resin. The 10% copper hydroxide formulation of copper borate provided superior protection against mould, while all formulations tested gave adequate protection against fungal decay and Formosan termite attack. This paper summarizes over 5 years of research and the production of several hundred panels.

Download document (126 kb)
free for the members of IRG. Available if purchased.

Purchase this document