A limited understanding of the fundamental aspects of supercritical fluid (SCF) impregnation in wood remains an obstacle to the development of this technology. Developing a better understanding of the effects of various process parameters on treatment results would facilitate more rational development of SCF impregnation. In this project, the effect of treating period and specimen length on supercritical fluid impregnation of cyproconzaole was evaluated on Douglas-fir heartwood using temperature decrease to induce biocide deposition. The results showed that biocide movement was slower than expected, and suggested that diffusion was the primary phenomena accounting for biocide penetration into the interior of sample. Further trials will be required to better understand the mechanism of biocide movement.

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