8-018 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-018 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 0.739 in (18.77 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.879 in (22.33 mm), catalogued under part number HB90018. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

As a material, Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. The material holds up against greases and lubricants, petroleum-based oils, and many alcohols. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or automotive brake fluid.

Common environments for this compound include construction equipment, fluid power, and general industrial maintenance.

Order part number HB90018, sold individually. Unit weight is approximately 0.144 g. Check the compound against your process media, pressure and temperature before committing to a design.