8-448 BLACK FKM 90D BACK-UP RING

VBU90448 is an AS568-448 black Viton® (FKM) 90 Shore A Back-Up Ring supplied with an inside diameter of 9.475 in (240.67 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 10.025 in (254.64 mm). In service, this back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

As a material, Viton® (FKM) offers outstanding high-temperature capability and the industry benchmark where nitrile reaches its thermal limit. The material holds up against chlorinated solvents, aggressive chemicals, and engine and transmission fluids. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Exposure to amines or ketones and esters will shorten service life.

You will find this material specified across semiconductor equipment, aerospace, and automotive fuel systems.

VBU90448 ships individually. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.