Magnetorheological fluids is commonly known as Smart Fluids. MR fluids are basically a mixture of mineral oil or synthetic oil and Pure Iron Powder. MR fluids consists of around 30 % by volume of Pure Iron particles. Size of this Iron particles is around 10 microns. Viscosity of these fluids change drastically under influence of magnetic field. The Yield stress of the fluid in active state can be controlled very accurately by varying magnetic field. These fluids find applications in dampers, clutches, shock absorbers etc.
| Properties | MR1 |
Values MR2 |
MR3 |
| Weight Fraction (%) | 70 | 65 | 60 |
| Density (g/cm3) | 1.98 | 1.73 | 1.52 |
| Yield Stress (kPa) @174. 3 kA/m | 45 | 34 | 22 |
| Plastic Viscosity (mPa. s) @ 40°C | 78 | 70 | 65 |
| Magnetic Permeability, Relative @low Field | 3.5 | 2.5 | 1.5 |
| Response Time (s) | < 0.001 | < 0.001 | < 0.001 |
| Flash Point (°C) | > 150 | > 150 | > 150 |