As was done with the mechanical properties, the physical properties were standardrized for variations in density. A general decrease of 23–84% was observed in thickness swell and water absorption between the 100%boards and the fiber-reinforced boards. A comparison between the Wood-based particleboards revealed no significant differences in both thickness swell and water absorption characteristics for the first 2 h (Fig. 12). After 24 h of immersion significant differences (p = 0.0046 for thickness swell and p = 0.0496 for water absorption) were observed: the Wood–Flax particleboards swelled the least with the lowest water uptake corresponding to approximately 45% and 70% decrease respectively.