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South Bend, IN 360001


T-Lon Solutions

TLI Series Piston Seal

With over 30 years of application success, the TLI hydraulic piston seal is a proven reliable seal for both low and high pressure systems.

The TLI seal is a double-acting filled TLON® PTFE compound with a T-shaped elastomer energizer and two high compressive strength nylon back-up rings designed for extreme pressures in reciprocating applications. The filled PTFE seal ring is manufactured with an interference fit with the bore and optimum compression with the T-shaped energizer. This offers excellent sealability at low pressures and high pressures when the cylinder experiences ballooning. The two back-up rings must be installed with the inner radius facing the center of the seal and are designed assymetrical to prevent loader damage during the life of the seal.


  • Low seal drag/friction (Minimize energy loss)
  • No Stick-slip (Smooth Operation)
  • Long seal life from T-LON® filled PTFE compounds
  • Available for cylinders up to 45″ diameter


  • Heavy Duty Hydraulic Cylinders
  • Agriculture Equipment
  • Excavators
  • Testing Machinery

Technical Data:

(1) T-LON® seal compound determines velocity and seal life
  • Velocity: Up to 5 ft/s
  • Pressure: Up to 10,000 psi (Function of e-gap and T-LON® compound. Max velocity and pressure cannot be used together)

Most Common:


  • Highest Extrusion Resistance (Higher bronze content increases extrusion/wear resistance)
  • Good sealability


  • Good wear resistance for tubes with rougher surface finish
  • More chemical resistant and used in applications when seal could run dry
(2) Loader compound determines temperature and chemical compatibility

Most Common:


  • Working Temp. Range -30°F to 230°F (250°F intermittent)
  • Commonly used with greases, aliphatic hydrocarbon mineral and vegetable oils, and various hydraulic fluids
(3) Back-up rings prevent seal extrusion and allow larger e-gaps. Note temperature and chemical limitations

Most Common:

MoS2 Filled Polyamide

  • Working Temp. Range – 65°F to 250°F
  • Commonly used with greases, aliphatic hydrocarbon mineral and vegetable oils, and various hydraulic fluids. Avoid water based fluids.
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Have questions? Our team is ready to help with anything you need. Feel free to reach out.

Contact T-Lon 888.340.TLON