MBU-27X2.5X1.3 Metric Urethane Back-Up Ring

Metric Urethane Back-up Rings are designed to prevent extrusion in rubber O-ring sealing systems. The amount of this extrusion is affected by O-ring hardness, operating temperature, operating pressure and clearance of the mating surface.

Increased Pressure: The use of Back-up Rings should be considered for systems with operating pressure above 2000 PSI. At these pressures the mechanical forces applied to the O-ring may cause extrusion of the O-ring into the clearance gap.