-390 BLACK CHEMOURS VITON 75D O-RING

Ordered as VITON75390, this is an AS568-390 black Viton® (FKM) 75 Shore A O-Ring with an inside diameter of 20.953 in (532.21 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 21.373 in (542.87 mm). The o-ring compresses into its gland to block fluid or gas migration across a joint.

The compound resists chlorinated solvents, engine and transmission fluids, and aromatic hydrocarbons. That behavior comes from the compound itself: Viton® (FKM) is specified for excellent resistance to compression set and permeation, the industry benchmark where nitrile reaches its thermal limit. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. It is not the right choice where low-molecular-weight organic acids or amines are present.

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

This item is sold individually under part number VITON75390. Unit weight is approximately 68.7 g and nominal inside diameter is listed as 21 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.