8-177 BLACK FKM 90D BACK-UP RING

APG stocks the VBU90177, an AS568-177 black Viton® (FKM) 90 Shore A Back-Up Ring with an inside diameter of 9.487 in (240.97 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.693 in (246.2 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.

As a material, Viton® (FKM) is known for outstanding high-temperature capability and long service life in hot, chemically aggressive environments. This material stands up to engine and transmission fluids, chlorinated solvents, and aggressive chemicals. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. Exposure to low-molecular-weight organic acids or hot water and steam will shorten service life.

Common environments for this compound include chemical processing, aerospace, and automotive fuel systems.

Order part number VBU90177, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.