Treating characteristics, field stake efficacy and the results from treatment trials for oilborne copper naphthenate (CuNap) and Douglas-fir parallel strand lumber (PSL) are summarized in this paper. Treatment with a P9 Type-C based solution in laboratory tests showed full cross section penetration of large cross sections could be achieved. Commercial treatment trials using a P9 Type-A solution showed that AWPA Standards for penetration and retention of CuNap could be met and that the use of a steam conditioning step had no negative impact on product dimensions. The ability of oilborne copper naphthenate to protect Douglas-fir PSL is demonstrated with field stake test data conducted in Florida over 12 years of exposure.

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