U-cups are unidirectional sealing elements with a U-shaped cross-section and a reinforcing metal spring. They are used for sealing applications involving rotary or translatory motion against aggressive media and pressure. PTFE U-cups are sealing components that enjoy a wide range of uses in the food and beverage industry as well as the pharmaceutical industry. They are ideal for the sealing of pressures, as the system pressure amplifies their sealing function, as well as for aggressive media, thanks to PTFE’s excellent media resistance.

U-cups contain a metal spring, which compensates for the loss of initial load caused by PTFE’s tendency to creep. The contact pressure can be tailored to the parameters of the individual application scenario by means of u-, v- or o-shaped springs – open or crimped. The u-ring can be manufactured as either an axially or radially functional element – meaning with an inwardly or outwardly directed sealing function. Depending on the application, numerous PTFE variations are available, including carbon- or glass-fiber-reinforced PTFE.