Heavy-Duty Piston Seal

Series 280: Heavy-Duty Piston Seal

The 280 Series heavy duty piston seal is a low-friction design, consisting of a PTFE-filled seal and a profiled energizer. It is designed for large-diameter, double-acting cylinders in challenging applications, where high pressure and large extrusion gaps exist.



Low friction

Double acing applications

High-temperature resistance

Low wear

Extrusion resistant

Compatible with a wide range of media

Available in diameters up to 2100 mm


The 280 Series heavy-duty piston seal is ideal for high-pressure sealing applications, offering low-friction performance and double-acting operation.

Typical Applications

  • Rolling Mills
  • Injection Molding Machines
  • Hydraulic Presses
  • Forging Presses


System Seals’ custom blended PTFE compounds provide ultra-low friction and high-speed performance with minimal wear. The standard compounds are PTFE with Bronze filler, or PTFE filled with Glass-Moly. The temperature range of the seal can be increased by selecting a FPM energizer in place of the standard NBR energizer.

Material Code
PTFE-Bronze compound + NBR O-ring MT23
PTFE-Bronze compound + FPM O-ring MT26
PTFE-Glass/MoS2 compound + NBR O-ring MT83
PTFE-Glass/MoS2 compound + FPM O-ring MT86
Temperature MT23


hydraulic oil -30…+100 -22…+212 -30…+100 -22…+212
water oil emulsions (HFA) - - +5…+60 +40…+140
water-glycol fl uids (HFC) - - -30…+60 -22…+140
polyol esters (HFD) - - - -
water - - +5…+100 +40…+212
Speed 5 m/s (16.4 ft/sec)
Pressure 400 bar (6000 psi)

Note: for other materials or fluids please contact our engineering department.