Diffusion of copper and boron from a groundline wrap formulation through Douglas-fir heartwood

The effect of grain orientation and moisture content (MC) on diffusion of copper and boron from a groundline wrap paste was evaluated in small Douglas-fir heartwood blocks over a 1-year period. Boron diffusion was consistently greater than that found with copper naphthenate, reflecting the higher water solubility of the former compound. Diffusion of both components was greatest in the longitudinal direction in blocks at 60 percent MC. In general, chemical movement was affected more by wood orientation than by MC. The results indicate that both components of the preservative paste were capable of significant diffusion through Douglas-fir heartwood.

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