Polypac Piston Seals for Hydraulic Cylinders

Polypac piston seals deliver reliable sealing for hydraulic cylinders. Made from filled PTFE and premium elastomers, they offer low friction, long life, custom sizes, and strict quality control.

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Product Details

Polypac Piston Seals for Hydraulic Cylinders

Polypac piston seals are engineered to provide reliable, low-friction sealing for hydraulic cylinders across industrial, mobile, and marine applications. Backed by over a decade of sealing expertise and advanced production facilities, our seals combine durable materials and precise manufacturing to maximize cylinder life and performance.

Why choose Polypac piston seals?

- Low friction and smooth operation, reducing energy loss and heat build-up.
- Excellent wear and extrusion resistance for long service life.
- Wide temperature and chemical compatibility to suit harsh environments.
- Custom sizes and designs to match OEM or retrofit requirements.

Materials & custom options

We started with filled PTFE technology and continue to lead with advanced compounds. Available materials include bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS2-filled PTFE, and glass-filled PTFE. For elastomer components and complementary seals, we supply NBR, FKM, silicone, EPDM, and FFKM. Custom blends and profiles are available for special working conditions.

Quality, testing and manufacturing strength

Polypac's custom rubber ring and O-ring factory covers over 10,000 m², with 8,000 m² of factory floor and industry-leading production and testing equipment. Founded in 2008, we maintain close R&D partnerships with universities and research institutes to validate material performance and improve seal life. Every piston seal undergoes strict dimensional checks and performance tests to ensure consistent quality.

Applications

Designed for hydraulic cylinders in construction machinery, agricultural equipment, industrial presses, marine systems, and more. Our seals perform well in high-pressure, high-speed, and contaminated environments.

Ordering & support

Polypac offers OEM cooperation, custom design, fast prototyping, and volume production. Technical support is available for material selection, installation guidance, and troubleshooting. Contact us for samples, drawings, or a quote — we tailor solutions to meet your exact needs.

Choose Polypac piston seals for dependable sealing performance, advanced materials, and proven manufacturing quality.

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Question you may concern

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 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.

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.

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.

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