Significant efforts have been devoted for developing biocide impregnation method into wood materials using supercritical fluid. Developing better understandings of fluid phase and its effect on treatment results would facilitate a more rational development of supercritical fluid (SCF) impregnation. In this project, the preservative treatabilities under super- and sub-critical fluid conditions were evaluated using Pinus Radiata sapwood. Treating characteristics are discussed in relation to different fluid phases and treatabilities (biocide penetration, distribution, and retention).

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