Resin-free fiberboards were manufactured using industrial fiber from Pinus radiata activated by in oxidative treatment using the Fenton reaction (H2O2/Fe(II)), A multivariate analysis was used to study the effect of fiber Moisture content (MC), press temperature (T), and the H2O2/Fe(II) ratio on the board internal bond strength (IB). Using response surface methodology, a set of maximum IB conditions was obtained. Validation of these conditions which included 25% MC, 170 degrees C press temperature and a H2O2/Fe(II) relation of 25 produced an optimal board with all IB strength of 0.888 MPa. Without the addition of sizing agents or other additives, the dimensional stability properties were 16% of thickness swell and 40% of the water absorption of control boards.