Our standard rubber balls are molded from a 70 Shore A nitrile compound specifically formulated for grinding. Our compound 525K is recommended for most typical pneumatic, hydraulic, or water applications.
Other elastometric compounds are also available for more demanding situations such as steam, high temperatures or corrosive fluids. Compounds with a hardness lower than 70 Shore A are difficult to grind. Harder materials are also available.
High speed centerless grinding combined with automatic gauging/measuring equipment assures you of a consistent, close tolerance on both spherical and diametric dimensions. The resulting uniform finish also ensures consistent sealing performance regardless of how the ball seats.