In Rayflon,Website:http://www.rayflon-seals.com, except Polyimide and POB filled piston cups, bronze filled PTFE cups sales are also very good for many years. The main property of Bronze filled PTFE compounds:Bronze filled PTFE offers a gain of several desirable property characteristics such as hardness, low wear, higher compressive strength, better dimensional stability, higher thermal conductivity, low creep and cold flow. Bronze filled PTFE is especially designed for heavy duty mechanical service such as bearing applications.Filler reinforced PTFE piston cups features:Wear resistanceCreep resistanceLow coefficient of frictionGood sealing performance Long service durability