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Nylon Balls, PA Nylon ball is used in check valves, light load bearings, knobs and toggle switches and other applications where low cost and resiliency are more important than hardness. Nylon Balls, PA Nylon ball has good resistance to alkalis, petroleum products and various mild chemicals. Nylon Balls, PA Nylon ball has high optical quality and tensile strength. It also has a high resistance to heat distortion and has a highly polished finish.