PTFE Balls can be filled with Glass fiber, Carbon, Graphite, Bronze and Colors
PFA (PerFluoroAlkoxy) tubing offers similar properties to FEP, but is considered more of a premium resin. PFA is preferred when extended service is required in hostile environments involving chemical, thermal, and mechanical stress
Polyimide refers to a class of synthetic polymers. Adding polyimide produces a PTFE compound that is lower in friction than all of those previously described. It is non-abrasive, making it a good choice for applications involving softer mating surfaces like steel, aluminium, or other plastics. Polyimide filled PTFE therefore suits dry running and stop-start applications particularly well. However, polyimide is the priciest of the PTFE fillers.
PTFE Bronze Filled is the most common metal filler and it is dark brown in color. Bronze filler has excellent wear, creep resistance, and higher thermal conductivity than glass fiber with PTFE. Adding bronze in percentages between 40 and 60% can increase wear. PTFE Bronze-filled has poor chemical resistance in the presence of acids and alkali. PTFE Bronze-Filled is machined and used in bearings at high speeds when shafts are not hardened. It is useful in applications with higher mechanical loads and higher speeds rubbing contact points where bronze-filled supplies the strength and conductivity to carry away excess and unwanted heat. Used in hydraulic systems, superb for linear bearing, slides, guide ways, bearing rings, piston rings and wear pads., etc