The performance of preservative-treated or modified woods in marine exposures was evaluated at test sites in Newport, Oregon, USA and Brisbane, Queensland, Australia. All samples have exhibited excellent performance at the Newport, Oregon site, while attack was more aggressive at the sub-tropical Brisbane site. Acetylated wood as well as samples treated with 7.3% chromated copper arsenate (CCA-Type C) exhibited excellent resistance to marine borer attack at both test sites. Samples treated with a lower concentration of CCA experienced some marine borer attack, as did samples treated with 20 and 30% phenol formaldehyde (PF) resin. Samples treated with 10% PF resin experienced substantial marine borer attack at the Brisbane site while a Dreamdex® polymer impregnated wood experienced some attack at the same site. The results illustrate the excellent performance of Accoya® as well as good performance of the higher PF resin impregnated samples in comparison with CCA.

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