Fig. 4From: Effects of modification with a combination of styrene-acrylic copolymer dispersion and sodium silicate on the mechanical properties of woodSurface hardness of cross-section and radial section of poplar (a, c) and radiata pine (b, d) untreated and treated with 10% SAC and varying concentrations of SS, respectively. The labels in the x-coordinate and the meaning of box chart are same as Fig. 2Back to article page