Piston Compact Seal Set P18

Five-piece compact seal P18 is double-acting piston seal P18 is compossed of five elements: main sealing element in NBR or special material on request, two pressure ring in rubber reinforced fabric and two guide rings in acetal resines POM

Multiple sealing lips on central rubber part provides maximum sealing efficiency and energized both cotton fabric reinforced U-rings when pressure is applied. This sealing set achieves an excellent sealing effect, effective sealing even during vibration or impact loading without extrusion into the sealing gap and enables easy installation in an open groove.

Applications with severe vibration, shock and high pressure
Industrial vehicles
Lift platforms
Earth moving equipment

Standard material
Material set code, standard SN218
Rubber NBR 80 Shore
Fabric reinforcement Cotton
Guide ring POM


For very low temperature up to -60 °C, or high temperature applications up to 200 °C, and for excellent medium-rubber compatybility in special applications a few materials are recommended and available on request

Pressure, Speed
Working pressure Up to 70 Mpa
Running speed v Up to 0,5 m/s

Medium, Working Temperature
Material Set Code SN218
Hydraulic oils: HL, HLP -30 to 100˚C
HFA, HFB fluids +5 to +60˚C
HFC fluids -30 to +60˚C
Water +5 to +90˚C
Mineral greases -30 to +100˚C

Surface quality*
Surface roughness Ra Rmax
Sliding surfaces 0.05 .. 0,3μm ≤ 2,5 μm
Groove base ≤ 1,6 μm ≤ 6,3 μm
Groove flanks ≤ 3 μm ≤ 15 μm
Chamfer ≤ 4 μm ≤ 16 μm

*Contact area Mr = 50% to 90% at cutting depth c=Rz/2 and reference line Cref=0%