Microscopic Examination of Pressure-Treated Wood

A variety of softwoods and hardwoods were pressure treated with creosote or pentachlorophenol dissolved in aromatic gas oil. They were sectioned for microscopical examination and photographed in color. Creosote and oil entered the same cells in most woods. Ray cells were more frequently penetrated in softwoods than in hardwoods. Tracheids were most important for holding oil in softwoods. The oil was present in the form of droplets or plugs, or it often completely filled tracheid or vessels. Bordered pits trapped and held oil. Gum deposits in rays restricted penetration and in some cases were more important than tyloses in limiting penetration.

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