Claron Polyseal Single Acting Piston Seal CPU/P

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The Claron style CPU…/P is an asymmetrical profiled lip seal manufactured in a high performance grade of Polyurethane and is suitable for piston sealing. The sealing lips are machine trimmed to ensure dimensional consistency and good low pressure sealing. Polyurethane exhibits outstanding abrasion and extrusion resistance. The offset lip design allows rapid energization of the seal without excessive axial movement.

Maximum Pressure
Max Speed                      Temp. Range Temp. Range
m/s                           -40°C to 80°C -40°C to 110°C
0.50                               280 Bar

0.15                               400 Bar

250 Bar

350 Bar


AU Polyurethane
DIN Hydraulic Fluid Description °C
H Mineral oil without additives 100
H-L Mineral Fluid with anti corrosion and anti ageing additives 100
H-LP Mineral oil as HL plus additives reducing wear, raising load 100
H-LPD Mineral oil as H-LP but with detergents and dispersants 100
H-V Mineral oil as H-LP plus improved viscosity temp. 100
HFA E Emulsions of mineral oil in water. Water content 80-95% 40
HFA S Synthetic oil in water. Water content 80-95% 40
HFB Emulsions of water in mineral oil. Water content 40% 40
HFC Aqueous polymer solutions. Water content 35% ns
HFD R Phosphoric acid ester based ns
HFD S Chlorinated hydrocarbon based ns
HFD T Mixtures of HFD R and HFD S ns
HEPG Polyglycol based ns
HETG Vegetable Oil based 60
HEES Fully synthetic ester based 60

These range perameters are Maximum simultaneous conditions. Optimum service conditions are affected by temperature, speed, pressure, surface finish and extrusion gaps.

Refer to appendix 1 for further information.

Note: Clearance gap F is the maximum permissable. i.e. gap completely on one side, in the temperature range of -30°C to 80°C

The use of a suitably selected Claron bearing ring will effectively reduce the clearance gap F max. to a value closer to F/2 thus increasing the pressure capability of the seal.


For surface finish and recommended lead in chamfers refer to the illustration below. For housing dimensions and machining

tolerances refer to the catalogue page of selected seal. Refer to Appendix 4 for value of tolerance symbols.


For the seal to function correctly, it is important that care be taken in fitting the seal within its housing. For a detailed checklist, refer to Appendix 3.


H9                           js11                    +0,25                   Nominal                 Nominal                  Min                    Max

ØD1 Ød1 L1 L2 S C R1
CPU 125098/P 32.00 25.00 5.60 5.00 3.50 3.00 0.20
CPU 196157/P 50.00 40.00 8.00 7.30 5.00 3.50 0.40
CPU 255216/1P 65.00 55.00 8.00 7.30 16.50 3.50 0.40
CPU 314185/P 80.00 47.00 17.00 16.00 12.50 8.00 1.60
CPU 393295/P 100.00 75.00 19.00 18.00 5.00 7.00 1.20

Style CPUO is fitted with an anti-extrusion ring on the OD

CPUO 236196/P 60.00 50.00 8.00 7.30 5.00 3.50 0.40





Claron Polyseals


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