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Polypac PU O-Rings — Durable Polyurethane Sealing Solutions

Polypac PU O-Rings provide exceptional wear resistance, high tear strength and long service life for hydraulic and dynamic applications. Custom sizes, advanced testing, and fast delivery from a trusted seal manufacturer.

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Product Information

Polypac PU O-Rings — Reliable Polyurethane O-Rings for Demanding Use

Polypac PU O-rings are engineered for applications that need superior abrasion resistance, high tear strength and long-term performance. Made from high-quality polyurethane, these O-rings excel in hydraulic systems, reciprocating shafts and other dynamic sealing environments where durability matters.

Why Choose Polypac PU O-Rings

Excellent wear and abrasion resistance — extends service life under sliding contact.
High tear and tensile strength — resists extrusion and mechanical damage.
Good chemical compatibility — suitable for many hydraulic oils and fluids.
Precision manufacturing — tight tolerances for reliable sealing and easy installation.
Custom sizes and compounds — tailored solutions for special working conditions.

Applications

Ideal for hydraulic cylinders, pumps, valves, and dynamic shafts. Polypac PU O-rings perform well in construction equipment, agricultural machinery, industrial hydraulics and other systems requiring repeated motion and heavy load-bearing seals.

Trusted Manufacturer with Advanced Capabilities

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier. Our factory covers more than 10,000 m² with 8,000 m² of production space and industry-leading production and testing equipment. Since 2008, we have expanded from filled PTFE seals to a full range of elastomer O-rings including NBR, FKM, silicone, EPDM, FFKM and polyurethane.

Quality & Custom Service

We partner with universities and research institutes to develop materials and solutions for special working conditions. Whether you need standard sizes or custom rubber rings, Polypac provides strict quality control, rapid prototyping and dependable delivery to meet production schedules.

Buy with Confidence

Choose Polypac PU O-rings for long-lasting, cost-effective sealing in demanding applications. Contact us for technical advice, sample orders and custom quotes to get the right polyurethane O-ring for your equipment.

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Question you may concern

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.

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.

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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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