This vacuum seal is a clean seal which retains magnetic fluid around a rotary shaft by using magnet. The seal is used as a vacuum seal for semiconductor manufacturing equipments and flat panel display manufacturing equipments, as a dust seal for bearings of conveying robots, etc.

▲Feature
About Magnetic Fluid
Magnetic fluid is a colloidal liquid consisting of nano-sized magnetic particles distributed through a liquid body. As the name suggests, magnetic fluid is attracted to magnetic bodies.
Magnetic fluid was originally developed in 1965 by S. S. Papell from NASA (National Aeronautics and Space Administration) as a rocket fuel propulsion technology for weightless environments. Subsequent modifications and enhancements have seen magnetic fluids adopted in a wide range of applications from the everyday to the cutting-edge.

▲Structure of Magnetic FluidMagnetic fluid consists of three components:
(1) magnetic particles, (2) surfactant and (3) a base liquid.
The performance of a magnetic fluid seal is largely dependent on the properties of the magnetic fluid. Without surfactant, the very small magnetite (Fe3O4) particles (approximately 0.01micro m) tend to separate and settle and do not remain evenly mixed with the base liquid. The surfactant envelops the magnetic particles and causes them to oppose one another within the base liquid. This prevents settlement and maintains a uniform distribution of particles.
Eagle Industry boasts an extensive understanding of the many parameters of magnetic fluids including particle size, surfactant structure, molecular weight and particle absorption, base liquid purity, surfactant compatibility and dispersion characteristics. These parameters are carefully tailored to produce optimized magnetic fluids for different applications.