Treatment of 8/4 hardwood lumber with borate preservatives

The minimum diffusion storage time required for adequate diffusion penetration of borate, the effects of borate formulation and wood species on initial loading and subsequent borate diffusibility, and the relationship between wood liquid permeability and borate diffusibility were studied. Packets of thirty-five 2 by 4 studs sawn from yellow-poplar, red oak, white ash, and white oak were dip-treated for 1 minute in Diffusol? and Tim-Bor? solutions. Treated packets were wrapped in plastic covers and stored for diffusion under a shed and sampled after 20 hours, and 2, 4, 6, and 8 weeks. Results indicated that more than 8 weeks of diffusion storage are needed for an adequate borate penetration for all four species. Diffusol reaches a higher core boric acid equivalent than Tim-Bor for a given diffusion time. Diffuse-porous wood treated better than ring-porous wood, and borate penetration into these samples was more closely related to radial permeability than longitudinal permeability.

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