One of the parameters used to characterize briquettes is relaxed density, i.e., the density of briquette after removal from the press. As shown in Table 1, the average compressed density of the briquettes (i.e., density determined immediately after compression) ranged from 8.1g/cm3 to 11.2g/cm3, while the average dry density ranged from 3.7g/cm3 to 6.3g/cm3. These values give a relaxation ratio (i.e., ratio of compressed density to relaxed density) of between 1.8 and 2.5. O’Dogherty (1989) reported a comparable relaxation ratio in the range of 1.65 to 1.80 for briquetted hay materials.