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Electrorheological (ER) properties and vibration-proof effect in the suspension dispersed the hexagonal plate-like aluminum oxide particles in silicone oil have been investigated experimentally. On the rheological properties taken with the static and dynamic methods, it is shown that the suspensions are shifted from Newtonian behavior to Bingham behavior by the applied dc electric field. The shear stress depends on the viscosity of dispersion medium (silicone oil) and the particle size. A low current density is an advantage of this ER fluid. The dispersive stability of particles in the test ER fluids has also been examined for the dispersion mediums with different kinematic viscosities. The morphological effect of particles on the ER response is discussed qualitatively. The effect of ER fluid on the vibration control is examined using a single degree-of-freedom (SDOF) system.