8-431 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-431 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 5.225 in (132.72 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.775 in (146.69 mm), catalogued under part number HB90431. It allows a standard o-ring to operate at higher pressures than it could unsupported.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, most widely specified general-purpose sealing elastomer. The compound resists many alcohols, hydraulic fluids, and propane and butane. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or automotive brake fluid will shorten service life.

Common environments for this compound include fluid power, general industrial maintenance, and hydraulic and pneumatic systems.

HB90431 ships individually. Unit weight is approximately 9.6315 g and nominal inside diameter is listed as 5 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.