Hydraulic Piston Seal — Polypac

Polypac Hydraulic Piston Seal offers reliable, low-friction sealing for high-pressure hydraulic cylinders. Built from advanced PTFE and elastomers with strict testing and custom options for harsh conditions.

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Product Details

Hydraulic Piston Seal — Polypac

Polypac hydraulic piston seals are engineered to provide dependable sealing in hydraulic cylinders, reducing leakage and extending component life. Designed for easy installation and stable performance under high pressure, these seals suit construction, agricultural, mobile, and industrial machinery.

Key Features

- Reliable sealing under high pressure and frequent load changes.
- Low friction design for smoother piston movement and reduced wear.
- Wide temperature and media compatibility to suit diverse working conditions.
- Available in standard sizes and fully customizable designs.

Materials & Applications

Polypac began with filled PTFE technologies — including bronze-, carbon-, graphite-, MoS₂- and glass-filled PTFE — and expanded to elastomers such as NBR, FKM, silicone, EPDM, and FFKM. This material range ensures the right balance of hardness, elasticity, and chemical resistance for applications from hydraulic presses to mobile equipment.

Quality & Customization

Our factory exceeds 10,000 m² with 8,000 m² of production space and advanced production and testing equipment. Polypac works closely with universities and research institutions to improve materials and test methods. We offer custom sizes, compound formulations, and designs for special working conditions, backed by stringent quality checks for durability and leakage control.

Why Choose Polypac

Choosing Polypac means choosing proven manufacturing experience and technical support. Our seals deliver longer service life, lower maintenance costs, and reliable performance. We prioritize fast responses, clear communication, and tailored solutions so your equipment runs safer and more efficiently.

Contact Polypac for technical advice, material selection help, or to request a custom hydraulic piston seal sample tailored to your application.

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FAQ

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

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.

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.

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.

If you don’t find your answer, please E-mail us and we’ll be happy to help you out.

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