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What Seals Are Used in Hydraulic and Pneumatic Systems?

The fluid power industry powers everything from construction and injection molding equipment to off-highway machinery and aerospace systems. These systems use pressurized fluids—hydraulic or pneumatic—to perform mechanical work, and reliable seals are essential to their performance.

North Coast Seal provides sealing solutions that:

  • Maintain pressure and prevent fluid leaks
  • Perform under extreme temperature and load conditions
  • Extend the life of cylinders, pumps, and valves

We offer a wide range of seals—including O-rings, piston seals, rod seals, rotary seals, and more—to match your system’s demands.

machinery

Choose the Right Seal Material for High-Pressure, High-Performance Systems

Seal performance depends on material selection. We offer compounds that handle heat, pressure, abrasion, and chemical exposure across a range of hydraulic and pneumatic applications.

Our most common fluid power sealing materials include:

  • Nitrile Rubber (NBR): Excellent resistance to hydraulic fluids, oils, and fuel

  • Viton® (FKM): Ideal for aerospace, chemical processing, and high-heat environments

  • Polyurethane: High abrasion resistance and flexibility for dynamic, high-pressure seals

  • PTFE: Low friction and chemical resistance for tight tolerance sealing

  • EPDM, Silicone, Fluorosilicone: Withstand ozone, weather, and thermal cycling

  • Thermoplastic Elastomers (TPEs): Great for custom profile seals with complex performance needs

Not sure which material is right? We can help.

Frequently Asked Questions About Fluid Power Seals

What types of seals are used in hydraulic systems?

Hydraulic systems typically use O-rings, piston seals, rod seals, and wipers made from nitrile rubber, polyurethane, or FKM. These seals must withstand high pressure and resist hydraulic fluids and heat.

What’s the difference between hydraulic and pneumatic sealing needs?

Hydraulic systems deal with higher pressures and fluid leaks, so seals must resist compression and extrusion. Pneumatic seals operate at lower pressure but must handle rapid movement and air-tight sealing without lubrication.

Which seal materials are best for high-pressure environments?

Polyurethane, Viton®, and PTFE are commonly used in high-pressure applications due to their durability, chemical resistance, and mechanical strength.

How do I know which seal type or material to choose?

We’ll evaluate your system’s fluid type, pressure, temperature range, and motion type to recommend the ideal sealing solution for your application.

Get Top Fluid Power Sealing Solutions

CHOOSE NCS FOR EFFECTIVE SEALING

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