The objective of this research was to evaluate the effect of length size particle on physical and mechanical properties of particleboard. Sorghum bagasse was cut into 3, 5, and 7 cm length size. Furthermore, particles were dried until reached of4% moisture content. Amount of 10% urea-formaldehyde (UF) resin used for binding. Hot pressing process conducted in 130C temperature for 10 minutes and 30 kg cm -2 pressure. The results showed that thickness swelling (TS) and internal bond (IB) did not fulfill of requirement of Japanese Industrial Standard (JIS) A 5908 (2003). According to all parameters, 3 cm length size of particle was resulting in the best properties.
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