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The durability of acetylated radiata pine sapwood (Accoya). Results from five years testing
2011 - IRG/WP 11-30560
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.
M Hedley, D Page, J van der Waals, K Nasheri, G Durbin


The resistance of high performance acetylated wood to attack by wood-destroying fungi and termites
2013 - IRG/WP 13-40621
The resistance of high acetyl solid timber (Accoya) and medium density fibreboard (Tricoya) to attack by wood-destroying fungi and termites was investigated under both laboratory and field conditions. Laboratory studies were conducted in Japan, New Zealand and USA. Field studies were conducted in Australia, Japan, New Zealand, Thailand and UK. The results of the laboratory and field studies against decay fungi support previously published work showing that high acetyl timber is highly resistant to attack by wood destroying fungi. The laboratory and field studies against termites have improved knowledge of the resistance of acetylated wood to attack by termites; it has been demonstrated that Accoya is highly resistant to attack by two species of the highly destructive Coptotermes genus. It would be expected that Accoya would exhibit excellent long-term performance against wood destroying fungi and termites in most regions in the world.
J Alexander, J Hague, M Roberts, Y Imamura, F Bongers, E Suttie


The resistance of Accoya® and Tricoya® to attack by wood-destroying fungi and termites
2014 - IRG/WP 14-40658
The resistance of high acetyl WPG solid timber (Accoya®) and medium density fibreboard (Tricoya®) to attack by wood-destroying fungi and termites was investigated under both laboratory and field conditions. Laboratory decay studies were conducted in Australia and New Zealand. Field studies were conducted in Australia, Japan, New Zealand, Thailand and USA. The results of the laboratory and field studies against decay fungi support previously published work showing that high acetyl WPG timber materials are highly resistant to attack by wood destroying fungi. The field studies against termites have further enhanced knowledge of the resistance of acetylated timber materials to attack by termites; it has been demonstrated that Accoya® and Tricoya® are resistant to attack by the highly destructive Australian subterranean termite species Mastotermes darwiniensis. It would be expected that Accoya® and Tricoya® would exhibit excellent long-term performance against wood destroying fungi and termites in most regions in the world.
J Alexander, J Hague, F Bongers, Y Imamura, M Roberts