8-466 BLACK FKM 90D BACK-UP RING

Part number VBU90466 is an AS568-466 black Viton® (FKM) 90 Shore A Back-Up Ring with an inside diameter of 18.455 in (468.76 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 19.005 in (482.73 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

It resists petroleum oils and fuels, many acids, and chlorinated solvents. Viton® (FKM) delivers excellent resistance to compression set and permeation, the industry benchmark where nitrile reaches its thermal limit. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving hot water and steam or low-molecular-weight organic acids call for a different compound.

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

VBU90466 ships individually. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.