8-239 BLACK FKM 90D BACK-UP RING

Part number VBU90239 is an AS568-239 black Viton® (FKM) 90 Shore A Back-Up Ring measuring an inside diameter of 3.609 in (91.67 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.887 in (98.73 mm). A back-up ring installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

This material stands up to many acids, aromatic hydrocarbons, and chlorinated solvents. Viton® (FKM) offers long service life in hot, chemically aggressive environments and outstanding high-temperature capability. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C).

It sees regular use in high-temperature process equipment, semiconductor equipment, and aerospace.

VBU90239 ships individually. Unit weight is approximately 1.8333 g and nominal inside diameter is listed as 3 5/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.