8-464 BLACK FKM 90D BACK-UP RING

Part number VBU90464 is an AS568-464 black Viton® (FKM) 90 Shore A Back-Up Ring measuring an inside diameter of 17.455 in (443.36 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 18.005 in (457.33 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

As a material, Viton® (FKM) is specified for the industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. Expect good resistance to many acids, aggressive chemicals, and aromatic hydrocarbons. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Verify compatibility before use with hot water and steam or ketones and esters.

Maintenance and OEM teams specify it across oil and gas, chemical processing, and aerospace.

This item is sold individually under part number VBU90464. Nominal inside diameter is listed as 17 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.