Effect of wood steaming during fiber generation processes and creosote oil on the properties of fiberboard, manufactured from creosote treated solid wood were investigated. Pulp fiber was generated by alkaline pretreatment of waste creosote impregnated wood which being fiberized by laboratory defibrator, atmospherically. These fibers blended with 0, 15, 30, 45 and 100 percent by weight of wood virgin fiber; generated at high steam pressure treatment. All fiber mixtures formed, dried and hot pressed to produce 3mm(d:1g/cm3) nominal thickness hardboard. Acidified creosote oil (free of high molecular weight poly aromatic hydrocarbons) was added to each fiber composition distinctly to evaluate and compare specifications with creosote free board specimens. All specimens were tested physically and mechanically to evaluate the effect of oil presence and wood steam treated fiber ratios on water absorption and thickness swelling after 2&24 hours submersion in distilled water. The results showed that creosote is responsible to decrease water uptake and thickness swelling of wood-based composite materials effectively and steam treatment in comparison to sodium hydroxide as precursor of fiber disintegration, is more efficient to improve both physical and mechanical properties of the fibrous sample boards.

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