Effects of addition of boron (B) particles on performances of RDX-based plastic bonded explosives (PBX) have been evaluated with regard to prevention against Neumann effect from simulated devices for high explosive anti tank warheads, through measurements of penetration lengths during steel plate penetration tests for, PBX samples with various B contents of up to 10wt%. Detonation velocities, sensitivities against heat and impact, and mechanical properties have also been examined for PBX samples tested: detonation velocities were measured by using a high-speed photographic method; sensitivity against heat was evaluated through Krupp ignition temperature test; sensitivity against impact was evaluated through 5kg-drop hammer test; and tensile and compression stresses have been measured with regard to mechanical properties. Although there were only slight changes in detonation velocities and in suppression abilities in steel plate penetration lengths when up to 5wt% B particles were added, improvements have been observed in both aspects, when weight content of B particles increased by up to 10wt%, even though PBX samples were observed to become more sensitive against heat and impact; and experimental values for tensile and compression stresses of PBX samples have also increased with the increase in weight content of B particles.