Western red cedar and southern yellow pine sapwood were dip treated with a new formulation of waterborne copper naphthenate (Cunapsol®) which complies with VOC regulations. Cunapsol dip treated samples were oven dried at 50°C for 48 hours and then water leached for two weeks. Decay resistance and leachability of preservatives from dip treated specimens were evaluated according to AWPA (American Wood Preservers' Association) standard methods. CCA type C, ACQ type D and oilborne copper naphthenate were used for comparison purposes. Test results suggested that copper loss during leaching of dip treated samples is higher with copper amine based solutions than with CCA type C or oilborne copper naphthenate. Weight loss of treated samples was negligible suggesting that a copper retention of 1.70 ± 0.20 kg/m³ (0.10 pcf) from waterborne copper naphthenate offers adequate protection to western cedar and southern yellow pine.

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