Particle Size Analysis

The most commonly used metrics when describing particles size distributions are D-Values (D10, D50 and D90) which are the intercepts for 10, 50 and 90% of the cumulative mass [19]. According to the results shown in Figure 2, D10, D50, and D90 values of the SP were 3.9 μm, 18.5 μm and 52.3 μm, respectively. The D90 value of the SP was smaller than the corresponding values (114.1 μm) recorded for wood ash in the study of Vu et al. [11]. Moreover, the tested material contained 14% of ultrafine particles (φ < 5 μm). Therefore, SP is suitable for use as a filler to reduce the porosity in the particleboard.

**Figure 2.** Particle size analysis of SP.
