The RH was obtained from rice mill in Chuncheon, capital city of
Gangwon Province, South Korea. The moisture content of the RH
particles prior to the manufacture of the sandwich-structured
composite was 3–5% based on the oven-dry weight of the RH particles.
The average length, width, and thickness of the RH particles
used in the experiments were 6.79 ± 0.35 mm, 2.96 ± 0.26 mm,
0.17 ± 0.02 mm, respectively (these values were an average of 30
the RHs and standard deviation). European ash (Fraxinus excelsior)
wood strands, (the strand size: length 90–100 mm,