To prepare RDF5, all raw materials were well mixed at the volumetric mixing ratios of 7:1:1:1, 6:1:1:2 and
5:1:1:3 (sawdust: corrugated paper: polyethylene plastic bag: dry cooked rice). Glycerin, used as a binder, was
added into the raw material with the volumetric ratio of 0.25:100 and the mixture was then hot extruded at the
operating temperatures of 200, 230, and 260°C. Geometry of the densified fuel obtained is octagon hollow-cylinder
with the inner diameter of 1 cm, outer diameter of 5 cm, and length of 15-20 cm. The prepared briquettes were kept
in polypropylene bags for further characterization.