8-008 BLACK FKM 90D BACK-UP RING

Part number VBU90008 is an AS568-008 black Viton® (FKM) 90 Shore A Back-Up Ring supplied with an inside diameter of 0.176 in (4.47 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.316 in (8.03 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.

Viton® (FKM) is specified here for industry benchmark where nitrile reaches its thermal limit and long service life in hot, chemically aggressive environments. The material holds up against chlorinated solvents, aggressive chemicals, and engine and transmission fluids. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. Verify compatibility before use with low-molecular-weight organic acids or ketones and esters.

It sees regular use in chemical processing, semiconductor equipment, and aerospace.

Reference part number VBU90008 when ordering; the item is sold individually. Unit weight is approximately 0.056 g and nominal inside diameter is listed as 3/16 inch. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.