Durability and density are the main parameters used to describe the
physical quality of densified solid biofuels like pellets and briquettes [5].
Durability (abrasive resistance) tests simulate the mechanical handling
of pellets and predict the possible fine powders produced due to mechanical
handling [1]. Fasina [6] found that the durability of peanut
hull pellets increased initially with moisture content and reached a
maximum of 90.3% at 9.1% moisture content; however, further increasing
the moisture content reduced the durability to 76.0%. Similar trends
have been reported for alfalfa [7] and switchgrass pellets [8]. Kaliyan
and Morey [9] found that the durability of corn cob briquettes made at
25 °C was 0%, but preheating corn cob grinds with approximately 10%
(w.b.)moisture content to 85 °C produced briquetteswith a unit density
of N1100 kg m−3 and durability of approximately 90%.