Fig. 6From: High-pressure densification and hydrophobic coating for enhancing the mechanical properties and dimensional stability of soft poplar wood boardsAverage hardness of specimens which were control (0.1 MPa), 25 MPa treatment, 50 MPa treatment, 75 MPa treatment, 100 MPa treatment and 125 MPa treatment. (Error bars present standard deviations, and letters mean significantly different levels at p = 0.05)Back to article page