Abstract
Vapour Boron Treatment is a new and innovative method for timber preservation developed by the New Zealand Forest Research Institute. The process involves preservation with a vapour-phase chemical which significantly decreases the treatment time compared with traditional aqueous-phase techniques. The boric acid retention profile in a piece of timber which has been treated by the new process can be accurately predicted by a model which includes both convective and diffusive fluxes, if the initial moisture content of the timber is known. The reaction rate between the adsorbed water and trimethyl borate is a strong function of the differential heat of adsorption. Therefore, the lower the moisture content (the higher the differential heat of adsorption) the slower the reaction rate and the better the penetration of boric acid. It was found that a binary diffusion representation was adequate and consequently more elaborate diffusion models were not necessary.
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