Virgin Efalon^®(PTFE) hydraulic rings are used in high chemical resistance, low velocity and low pressure applications.

Carbon-filled Efalon^®(PTFE) hydraulic rings are used the most.They have very high wear resistance against deformation and wear under load. They have perfect wear resistance in dry and wet environments. They do not wear off surface in contact even at high velocities. They have very high heat conductivity. Compared to other filler types, their resistance to alkalies is better, but their resistance to oxidizers is less than glass-filled.

Glass-filled Efalon^®(PTFE) hydraulic rings are recommended where chemical resistance is important. Only their resistance to alkalies is low. They can wear off surface in contact at high PV values if surface in contact is not hard enough. Compared to virgin PTFE hydraulic rings, they have higher wear resistance and deformation resistance under load.

Bronze-filled Efalon^®(PTFE) hydraulic rings have highest heat conductivity, but their chemical resistance is not good. Generally speaking chemical environments that affect bronze have an effect also on bronze-filled PTFE. Their resistance to deformation and wear under load is good. They can be used at low and high PV values where chemical resistance is not essential. If surface in contact is not too hard, they are also appropriate at high speeds in dry conditions.