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Urethane Piston Seal - Polypac Polyurethane Hydraulic Seals

Urethane Piston Seal by Polypac — Durable Polyurethane Solutions

Features & Benefits

Polypac's Urethane Piston Seal offers exceptional wear resistance, high tear strength, and superior rebound for long service life in demanding hydraulic systems. The Urethane Piston Seal minimizes extrusion and heat buildup while ensuring consistent dynamic sealing and low friction across a wide temperature range.

Materials & Performance

Made from engineered polyurethane formulations, our Urethane Piston Seal balances hardness and elasticity to resist abrasion, cutting, and hydrolysis. We optimize polymer blends for specific pressures, speeds, and media—ensuring reliable performance in oil, water-glycol, and specialty fluids.

Common Applications

Ideal for hydraulic cylinders in construction, mobile equipment, industrial presses, and material handling, the Urethane Piston Seal performs well in high-cycle, high-load environments. Its combination of resilience and dimensional stability makes it a go-to choice for heavy-duty piston sealing.

Customization & Sizes

Polypac provides custom grooves, lip geometries, and integrated backup rings for tailored sealing solutions. Our factory supports large-volume production and small-batch prototyping—producing metric and imperial sizes, custom cross-sections, and assembly-ready components.

Manufacturing Expertise

Founded in 2008, Polypac has evolved from PTFE-filled seals to a full portfolio that includes O-rings (NBR, FKM, silicone, EPDM, FFKM) and bespoke polyurethane components. Our 10,000+ m² facility and advanced production equipment ensure consistent quality and fast lead times for Urethane Piston Seal orders.

Quality Assurance & Testing

We perform dimensional inspection, hardness profiling, tear testing, and simulated service life trials. Collaboration with universities and research institutes reinforces our materials development and process controls to meet strict hydraulic standards.

Why Choose Polypac

Polypac combines decades of sealing expertise with advanced materials science to deliver reliable Urethane Piston Seal solutions. From concept to production, our technical team supports product selection, testing, and on-site troubleshooting to reduce downtime and extend equipment life.

Ordering & Support

Contact Polypac for technical datasheets, 3D drawings, and sample runs. We offer competitive pricing, global shipping, and responsive technical support to help you specify the optimal Urethane Piston Seal for your system.

Urethane Piston Seal Display

FAQ:

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

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.

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.

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.

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.

Table of Contents

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Urethane Piston Seal by Polypac — Durable Polyurethane Solutions
Features & Benefits
Materials & Performance
Common Applications
Customization & Sizes
Manufacturing Expertise
Quality Assurance & Testing
Why Choose Polypac
Ordering & Support
Urethane Piston Seal Display

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