Two types of tannin-phenol formaldehyde adhesives -(i) a mixture of 70% Mangrove tannin and 30% phenol formaldehyde (PF) and (ii) a mixture of 70% Quebracho tannin and 30% PF - were used in the fabrication of two sets of particleboards. The third set of boards was prepared using 100% PF resin. The bending strength and internal bond strength of the tannin-PF bonded boards met the specifications required for commercial boards. The modulus of rupture, modulus of elasticity, internal bond and dimensional stability of the PF bonded boards were higher than those of the tannin-PF boards. Mangrove tannin-PF boards had better bending strength and dimensional stability than Quebracho tannin-PF boards.