8-342 BLACK FKM 90D BACK-UP RING

This back-up ring is supplied in AS568-342 black Viton® (FKM) 90 Shore A built to an inside diameter of 3.6 in (91.44 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.02 in (102.11 mm), catalogued under part number VBU90342. It bridges the extrusion gap so the primary seal holds its shape under load.

Viton® (FKM) is known for long service life in hot, chemically aggressive environments and very low compression set at elevated temperature. Expect good resistance to many acids, aromatic hydrocarbons, and chlorinated solvents. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Exposure to low-molecular-weight organic acids or ketones and esters will shorten service life.

Common environments for this compound include high-temperature process equipment, aerospace, and chemical processing.

This item is sold individually under part number VBU90342. Unit weight is approximately 4.213 g and nominal inside diameter is listed as 3 5/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.