8-264 BLACK FKM 90D BACK-UP RING

This back-up ring is supplied in AS568-264 black Viton® (FKM) 90 Shore A built to an inside diameter of 7.484 in (190.09 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.762 in (197.15 mm), catalogued under part number VBU90264. It bridges the extrusion gap so the primary seal holds its shape under load.

As a material, Viton® (FKM) is known for very low compression set at elevated temperature and outstanding high-temperature capability. It resists aromatic hydrocarbons, many acids, and chlorinated solvents. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). It is not the right choice where low-molecular-weight organic acids or amines are present.

You will find this material specified across chemical processing, high-temperature process equipment, and oil and gas.

Reference part number VBU90264 when ordering; the item is sold individually. Nominal inside diameter is listed as 7 1/2 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.