Corn cobs are potential feedstocks for producing heat, power, fuels, and chemicals. Densification of corn cobs into briquettes/pellets would improve their bulk handling, transportation, and storage properties. In this study, densification characteristics of corn cobs were studied using a uniaxial piston-cylinder densification apparatus. With a maximum compression pressure of 150 MPa, effects of particle size (0.85 and 2.81 mm), moisture content (10 and 20%w.b.), and preheating temperature (25 and 85 degrees C) on the density and durability of the corn cob briquettes (with diameter of about 19.0 mm) were studied. It was found that the durability (measured using ASABE tumbling can method) of corn cob briquettes made at 25 degrees C was 0%. At both particle sizes, preheating of corn cob grinds with about 10% (w.b.) moisture content to 85 degrees C produced briquettes with a unit density of >1100 kg m(-3) and durability of about 90%. (C) 2010 Elsevier B.V. All rights reserved.