U-cup seal U-N2

lippedelastomernitrile rubber

Description
The U-cup N2 is a one-piece, single-acting sealing element with a symmetrical U-profile, available in NBR and TPU. It is an active sealing element: as system pressure increases, the sealing lips generate higher radial load to improve sealing performance. Compared with the U-cup N1, the N2 features lower friction and is suitable for hydraulic and pneumatic systems. NBR grades are recommended as primary seals for system pressures up to 15 MPa. TPU (polyurethane) grades provide excellent abrasion resistance and can be used as primary and secondary seals for pressures up to 40 MPa. Standard hardness: NBR ≈90 Shore A; TPU standard compound ≈93 Shore A. Custom hardness and color options available on request.

Fields of application

• Static
• Dynamic
• Single-acting
• Double-acting
• Linear motion
• Rotary motion
• Oscillating motion

Main use
Hydraulic and pneumatic applications — sealing pistons and rods in cylinders

Materials
NBR (nitrile rubber), TPU (polyurethane)

Technical values
Variant — NBR: Pressure — up to 15 MPa
Variant — NBR: Temperature — -30°C / +100°C (material dependent)
Variant — NBR: Speed — up to 0.5 m/s
Variant — TPU: Pressure — up to 40 MPa
Variant — TPU: Temperature — -30°C / +100°C (material dependent)
Variant — TPU: Speed — up to 0.5 m/s

Technical specifications

• Design: one-piece, symmetrical U-cup profile
• Acting: single-acting (active sealing element)
• Materials available: NBR, TPU (polyurethane)
• Pressure rating: up to 15 MPa (NBR), up to 40 MPa (TPU)
• Temperature range: -30°C to +100°C (material dependent)
• Maximum speed: up to 0.5 m/s
• Hardness: NBR ≈90 Shore A; TPU standard compound ≈93 Shore A
• Applications: hydraulic and pneumatic systems; suitable as primary and (with TPU) secondary seals
• Performance notes: lower friction compared to U-cup N1; TPU offers excellent abrasion resistance