Polypac Piston Seals — Reliable Sealing from a Leading Supplier

Polypac provides high-performance piston seals and O-rings with advanced materials and custom solutions. With a large modern factory, strict testing, and years of experience, Polypac delivers durable, low-friction seals for demanding hydraulic applications.

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Product Description

About Polypac — Trusted piston seal suppliers

Polypac is a scientific and technical manufacturer and oil seal supplier specializing in piston seals, sealing materials, and customized sealing solutions for special working conditions. Founded in 2008, our factory covers over 10,000 m² with 8,000 m² of production space and industry-leading production and testing equipment.

What we offer

We supply a wide range of piston seals and related parts designed for reliability and long service life. Our product range includes filled PTFE variants (bronze, carbon, graphite, MoS₂, glass) and O-rings in NBR, FKM, silicone, EPDM, and FFKM. These materials are selected to deliver low friction, strong wear resistance, chemical compatibility, and stable performance under pressure and temperature variations.

Custom solutions for real-world needs

Polypac works closely with customers to tailor seals for specific machines and environments. Whether you need seals for high-speed cylinders, high-pressure hydraulics, food-grade equipment, or corrosive environments, we offer material selection, dimensioning, and testing to meet your requirements.

Why choose Polypac?

Quality and consistency: Advanced manufacturing and rigorous testing ensure every seal meets performance standards.
Broad material expertise: From PTFE-filled seals to high-performance elastomers, we match materials to application needs.
Scale and responsiveness: A large modern factory enables fast production and reliable supply for both standard and custom orders.
Research partnerships: Ongoing collaboration with universities and institutes keeps our designs and materials at the leading edge.

Applications and benefits

Polypac piston seals are used in hydraulic cylinders, heavy machinery, mobile equipment, and industrial systems. Customers benefit from reduced leakage, longer maintenance intervals, and better energy efficiency. Our seals help protect equipment and lower operating costs.

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Contact Polypac to discuss your piston seal needs. We value clear communication and will recommend the best material and design for reliable, cost-effective sealing solutions.

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FAQ

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.

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.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

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.

If you have any other questions, please write email to us or call us , we will reply you as soon as possible.

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