dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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Polypac U Lip Seal — Reliable Hydraulic U-Lip Seal

Polypac U Lip Seal is a robust hydraulic seal offering reliable, low-friction performance in harsh conditions. Available in multiple materials and custom sizes, backed by advanced testing and decades of expertise.

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Product Description

Product Overview

The Polypac U Lip Seal is designed for hydraulic and pneumatic systems that demand dependable sealing under pressure, speed, and temperature changes. Its U-shaped profile provides excellent contact and low leakage, making it an ideal choice for cylinders, pistons, and rod sealing applications.

Key Features

Reliable Sealing Performance

The U lip geometry maintains stable contact with the shaft to minimize fluid leakage while accommodating slight misalignment and wear. This results in longer life and fewer maintenance cycles.

Low Friction & Smooth Operation

Optimized lip design reduces friction and heat build-up, improving energy efficiency and reducing wear on mating surfaces.

Wide Material Options

Available in NBR, FKM, silicone, EPDM, FFKM, and PTFE-filled compounds (bronze, carbon, graphite, MoS2, glass). Choose the material that best matches your fluid compatibility, temperature range, and wear requirements.

Applications

Polypac U Lip Seals are used in hydraulic cylinders, industrial machinery, agricultural equipment, construction vehicles, and other systems where reliable rod or piston sealing is required. They perform well in both dynamic and static conditions.

Customization & Quality Assurance

Polypac offers custom sizes and compound formulations to meet special working conditions. Our factory spans more than 10,000 sq. meters with advanced production and testing equipment. We collaborate with universities and research centers to ensure product quality and continuous improvement.

Installation & Maintenance Tips

Inspect the shaft surface for scratches and burrs, ensure proper lubrication during installation, and avoid sharp edges that can damage the seal lip. Regular checks for extrusion and wear help extend service life.

Why Choose Polypac

Founded in 2008, Polypac combines deep sealing knowledge with modern manufacturing. From PTFE-filled seals to a wide range of elastomer O-rings, our solutions are proven, tested, and trusted. If you need a dependable U Lip Seal for demanding environments, Polypac delivers performance, customization, and peace of mind.

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Q&A

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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.

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

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PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

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