Polypac U-Cup Seal Category — Advanced Hydraulic Seals

Polypac U-Cup Seal Solutions — Reliable Sealing for Hydraulic Systems

Overview of U-Cup Seal Technology

The U-Cup Seal is a proven axial sealing element widely used in hydraulic cylinders and reciprocating applications. Polypac's U-Cup Seal series combines intelligent geometry with advanced materials to provide consistent sealing, low breakaway friction, and extended service life. Designed for both dynamic and static service, our U-Cup Seal options solve leakage and wear challenges across industries.

Design & Functionality

U-Cup Seals feature a U-shaped profile that enhances lip conformity under pressure, creating a reliable sealing interface that adapts to cylinder movement. Polypac engineers optimize lip thickness, support elements, and backup ring compatibility to balance sealability and friction. The result is stable performance under pressure spikes, temperature swings, and media variations.

Materials & Performance

Leveraging our heritage in filled PTFE and advanced elastomers, Polypac offers U-Cup Seal materials including bronze-filled PTFE, carbon-filled PTFE, MoS2 and graphite blends, as well as NBR, FKM, EPDM, silicone and FFKM elastomers. Material selection is matched to fluid compatibility, temperature range, and wear resistance to ensure superior life in hydraulic oils, aggressive media, and harsh environments.

Customization & Manufacturing Capacity

Founded in 2008, Polypac operates a custom rubber ring and O-ring factory covering over 10,000 m² with 8,000 m² production space. Our advanced production and testing equipment enable bespoke U-Cup Seal designs for special working conditions, tight tolerances, and high-volume programs. We collaborate with universities and research institutions to develop tailored sealing solutions.

Quality Assurance & Testing

Every U-Cup Seal undergoes rigorous dimensional, material and functional testing to meet international standards. Polypac's QC processes include tensile, hardness, leakage and endurance tests, ensuring reliable performance in demanding hydraulic and pneumatic systems.

Applications & Why Choose Polypac

Polypac U-Cup Seals are ideal for hydraulic cylinders, actuators, mobile equipment, and heavy machinery. With deep expertise in seal development and a broad material portfolio, Polypac delivers cost-effective, high-performance U-Cup Seal solutions backed by technical support and fast lead times. Contact Polypac to specify custom U-Cup Seals for your application.