There has been growing interest in porous ceramics in many research areas given their superior thermal and chemical resistance capabilities, unlike porous metals and porous polymers. Among the various types of porous ceramics, reticulated porous ceramics can offer significant industrial potential due to the low density and high permeability of these materials. However, environmental (for filtration) and military applications (for radar absorption) are somewhat rare owing to the rather low compressive strength of reticulated porous ceramics compared to other types of porous ceramics. Therefore, the aim of this study is to determine how to obtain high compressive strength in reticulated porous ceramics by optimizing the process conditions of the solid loading level and the particle size and by using additives in a ceramic slurry sample. The characteristics investigated include the pore characteristics (pore density, pore size and pore structure), the sintering behavior (linear shrinkage), the mechanical properties (compressive strength), and the dielectric properties (dielectric breakdown strength).