The simplest traditional ferrofluid-based seals construction consists of a ring permanent magnet 4 and two poles 1 on working surfaces of which circular teeth are located. Magnetic flow excited by the magnet 4, hold ferrofluid 3 in the working gap between fixed poles 1 and moving shaft 2, ensuring its hermetic sealing in relation to the fixed casing 5. Static gaps are sealed with fillers 6. Ferrofluid-based seals manufactured by FerroLabs, Inc. offer a number of advantages in comparison to conventional seals: * ensure absolute hermeticity, including in corrosive, toxic, and hazardous substance environments (helium leakage less than 10-12 m3Pa/s); * endure significant pressure fluctuations (up to 10atm) both in static and dynamic modes while intrinsic friction losses remain small; * high reliability with an operating life up to 15 years; * have simple configuration and are easy to manufacture. APPLICATION: SEMICONDUCTOR MANUFACTURING * FFS for growth equipment * FFS for coating application units (CVD, PVD, PECVD, MOCVD, etc.) VACUUM AND GAS TECHNOLOGICAL EQUIPMENT * FFS for coating application units (CVD, PVD, PECVD, MOCVD, etc) * FFS for gas lasers * FFS for electron-beam welding units * FFS for plasma units EQUIPMENT WITH STIRRING DEVICES * FFS for bioreactors\fermentors * FFS for chemical reactors