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Polypac U Lip Seal: High-Performance Hydraulic U-Lip Seals

Polypac U Lip Seal Overview

Polypac U Lip Seal Overview: Polypac designs and manufactures high-performance U Lip Seal products for hydraulic and oil sealing applications. As a scientific and technical hydraulic seal manufacturer, Polypac combines decades of expertise with advanced production lines to deliver reliable U-lip seals that protect systems from leakage, contamination, and wear.

Key Features

Key Features: Our U Lip Seal line features optimized lip geometry for low friction and excellent sealing under pressure. The U Lip Seal offers dual-lip contact for dynamic and static sealing, superior extrusion resistance, and compatibility with reciprocating and rotary motion — making it ideal where dependable sealing and long service life are required.

Materials & Customization

Materials & Customization: Polypac produces U Lip Seal components in a wide range of polymers and composites, including NBR, FKM, EPDM, silicone, FFKM, and filled PTFE compounds (bronze, carbon, graphite, MoS2, glass). Our custom rubber ring and O-ring factory supports tailored hardness, reinforcement, and compound formulations to meet special working conditions for your U Lip Seal application.

Applications & Working Conditions

Applications & Working Conditions: The Polypac U Lip Seal is engineered for hydraulic cylinders, fluid power systems, pumps, valves, and mobile equipment operating in extreme temperatures, high pressures, or abrasive media. Our sealing solutions are specifically adapted to mitigate leakage in harsh environments and extend maintenance intervals.

Quality Assurance & Testing

Quality Assurance & Testing: Polypac enforces strict quality control for every U Lip Seal, using advanced production and testing equipment across our 8,000 m² factory space. Collaborations with universities and research institutions underpin our material development and test protocols, ensuring consistent performance and compliance with industry standards.

Why Choose Polypac

Why Choose Polypac: Choosing Polypac for your U Lip Seal needs means partnering with one of China's leading seal manufacturers. We provide technical consultation, fast prototyping, scalable production, and long-term R&D support — backed by award-winning seal design and material science expertise.

Ordering & Technical Support

Ordering & Technical Support: Contact Polypac for custom U Lip Seal quotes, technical datasheets, and application guidance. Our team will help specify the right U Lip Seal material, dimensions, and tolerances to optimize performance and reduce total cost of ownership.

U Lip Seal Display

FAQ:

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

How important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

Table of Contents

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Polypac U Lip Seal Overview
Key Features
Materials & Customization
Applications & Working Conditions
Quality Assurance & Testing
Why Choose Polypac
Ordering & Technical Support
U Lip Seal Display

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