From Fig. 2, IB was highest in the stem, followed by leaf blade, and leaf sheath. Only the IB of stem powder met the requirement for Type-8 of particleboard (JIS A5908, 2003), although not all types of raw materials could meet the requirements for Type-5 of MDF (JIS A5905, 2014). The IB of leaf sheath powder was lower than that of whole powder. The leaf sheath part was considered to suppress the IB of whole powder, despite the weight ratio of the leaf sheath part is one third of whole rice straw.