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This study provides an investigation of particleboard manufacture using tannin-ureaformaldehyde adhesive. Test board samples were made with regard to various replacementpercentage of tannin–urea (levels of 0, 10, 20 and 30%) and press time (12 and 15 min) andtheir properties were determined. Achieved data were analyzed according to two sides factorialplan. The results showed that with replacement of 10% urea formaldehyde adhesive by tanninformaldehydeat both 12 and 15 min pressing times, thickness swelling (after 2 and 24 hoursimmersion in water) was decreased while internal bonding increased. There were no significanteffect on MOR and MOE values. In general, the results of present research showed thatreplacing the UF resin at lower levels of tannin is suitable as adhesive to manufactureparticleboard so that with replacement ratio of 90:10, the moisture properties of boards werevery close to permissible those of the exterior wood uses.