8-025 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-025 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 1.176 in (29.87 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.316 in (33.43 mm), catalogued under part number HB90025. It allows a standard o-ring to operate at higher pressures than it could unsupported.

The material holds up against water, petroleum-based oils, and greases and lubricants. Buna-N (Nitrile) is specified for an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or polar solvents will shorten service life.

You will find this material specified across hydraulic and pneumatic systems, automotive, and general industrial maintenance.

This item is sold individually under part number HB90025. Unit weight is approximately 0.22 g and nominal inside diameter is listed as 1 3/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.