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Polypac Nitrile Piston Seal

High-performance nitrile (NBR) piston seals from Polypac provide reliable oil resistance, low friction and long service life for hydraulic cylinders. Custom sizes, strict testing and fast delivery from an advanced factory.

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Product Information

Product Overview

Polypac Nitrile Piston Seals are engineered for dependable sealing in hydraulic cylinders and reciprocating systems. Made from quality NBR (nitrile rubber), these piston seals offer excellent resistance to hydraulic oils, good wear properties, and stable performance in common industrial environments.

Why Choose Polypac Nitrile Piston Seals

Reliable Oil and Wear Resistance

Nitrile (NBR) material is well suited for oil-based hydraulic fluids. Polypac's compound formulation balances oil resistance with abrasion durability to extend seal life and reduce maintenance frequency.

Low Friction and Stable Performance

Designed for smooth movement and tight sealing, these piston seals help reduce energy loss in cylinders and maintain consistent performance over repeated cycles.

Customizable and Cost-Effective

Polypac provides bespoke sizes, cross-sections, and hardness options to match specific cylinder designs and operating conditions. This flexibility delivers an optimal balance between cost and performance for both standard and special applications.

Typical Applications

Hydraulic cylinders for construction, agricultural and mobile equipment
Industrial presses and injection molding machines
Marine and material handling systems
Any reciprocating hydraulic system requiring reliable piston sealing

Technical Highlights

Material: Nitrile (NBR) compound optimized for hydraulic oil compatibility
Operating temperature: typically -30°C to +100°C (dependent on compound)
Pressure capability: suitable for standard to high-pressure hydraulic systems (design-dependent)
Options: various hardnesses, lip designs and custom dimensions

About Polypac

Founded in 2008, Polypac is a scientific and technical seal manufacturer. Our 10,000+ m² facility and advanced testing equipment support large-scale production and strict quality control. We began with filled PTFE seals and now offer a wide range of rubber seals including NBR, FKM, EPDM and more. We partner with universities and research institutions to continuously improve materials and designs.

Quality Assurance & Support

All seals are produced under rigorous processes and tested to ensure consistent performance. Polypac offers technical support to help select the right piston seal and provides fast, reliable delivery for OEM and aftermarket needs.

Get in Touch

Contact Polypac for samples, custom drawings, or performance recommendations. Our experienced team will help you choose the best nitrile piston seal for your hydraulic application.

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Frequently Asked Questions

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

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.

About other questions pls contact me directily.

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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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