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Custom Piston Seals — Precision Hydraulic Seals by Polypac

Custom Piston Seals by Polypac — engineered for performance

Precision Manufacturing & Materials

Polypac specializes in custom piston seals crafted from High Quality materials to meet demanding hydraulic applications. Since 2008 we have evolved from filled PTFE (bronze, carbon, graphite, MoS₂, glass) into a broad portfolio including NBR, FKM, silicone, EPDM and FFKM. Each custom piston seal is designed for optimal friction, wear resistance and sealing reliability.

Advanced Facilities & Testing

Our custom rubber ring and O-ring factory covers more than 10,000 m² with 8,000 m² of production space and industry-leading manufacturing and testing equipment. Polypac’s rigorous QA processes and laboratory testing ensure every custom piston seal meets pressure, temperature and life-cycle specifications required by OEMs and service providers.

Customized Solutions for Special Conditions

We provide tailored sealing solutions for extreme temperatures, aggressive media, high-speed reciprocation and heavy loads. Polypac collaborates long-term with universities and research institutes to develop specialized compounds and seal geometries—ensuring your custom piston seals perform where off-the-shelf products fail.

Applications & Performance Benefits

Our custom piston seals are used across hydraulics, mobile machinery, industrial actuators and offshore equipment. Benefits include reduced leakage, extended service intervals, smoother operation and compatibility with a wide range of hydraulic fluids. Material selection and profile optimization maximize lifespan and efficiency.

Why Choose Polypac

As one of China’s largest and most innovative seal manufacturers, Polypac combines decades of material expertise, advanced production capability and a customer-first approach. We offer rapid prototyping, scalable production and technical support to accelerate your product development cycle.

Get Started

Partner with Polypac for precision custom piston seals built to your specifications. Contact us to request samples, material datasheets, or a seal design consultation—engineered solutions that keep your hydraulic systems sealed and reliable.

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FAQ:

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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.

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 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.

Table of Contents

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Custom Piston Seals by Polypac — engineered for performance
Precision Manufacturing & Materials
Advanced Facilities & Testing
Customized Solutions for Special Conditions
Applications & Performance Benefits
Why Choose Polypac
Get Started
custom piston seals Display

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