Patent ID: 8361341

Claim:
A magnetorheological composition comprising a mixture of: a carrier medium; and a particle component disposed in said carrier medium and including; a magnetic material; and a nonmagnetic material including a plurality of particles selected from the group of aluminum, sand, vitreous material, ceramics, and combinations thereof, wherein said plurality of particles are hollow; wherein said nonmagnetic material is present in said particle component in an amount of from about 5 to about 95 parts by volume based on 100 parts by volume of said particle component; wherein said particle component is present in said magnetorheological composition in an amount of from about 20 to about 80 parts by volume based on 100 parts by volume of said magnetorheological composition; wherein said magnetorheological composition has an on-state yield stress at magnetic saturation of from about 0.1 to about 100 kPa.