New Zealand grown radiata pine sapwood was modified using the Accsys PLC acetylation process (Accoya). Following treatment, various test samples were exposed in the Scion Accelerated Field Test facility (Fungus Cellar) and in exterior ground contact field tests. In the Fungus Cellar, performance was compared with that of radiata pine treated with CCA to Hazard Classes H3.2 (0.37% m/m Cu+Cr+As) and H4 (0.63 % m/m Cu+Cr+As) and with kwila heartwood (Intsia bijuga). In the field trial performance was again compared with that of H3.2 and H4 treated radiata pine and with the heartwood of the naturally durable species teak (Tectona grandis), western red cedar (Thuja plicata) and cypress (Cupressus macrocarpa). In both tests and after five years, the Accoya wood was in better condition than the CCA treated samples and the four naturally durable species.

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