High-Performance Rod Seal for Hydraulic Cylinders | Polypac
Polypac Rod Seal for Hydraulic Cylinders
Performance and Materials
Polypac's rod seal for hydraulic cylinders combines advanced filled PTFE compounds and High Quality elastomers (NBR, FKM, EPDM, silicone, FFKM) to deliver low friction, long life, and superior resistance to wear, extrusion and aggressive fluids. Our heritage in bronze-, carbon-, graphite-, MoS2- and glass-filled PTFE ensures optimal sealing performance across temperature extremes and high-pressure environments.
Precision Manufacturing & Testing
Manufactured in our purpose-built facility, Polypac's custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of advanced production space. We use industry-leading machining and inspection equipment to control tolerances, surface finish, and material consistency—ensuring each rod seal for hydraulic cylinders meets rigorous dimensional and performance specifications.
Customization for Special Working Conditions
From standard geometries to bespoke profiles, Polypac offers tailored rod seals for hydraulic cylinders designed for high-speed rods, heavy loads, contaminated environments, and chemically aggressive media. Our R&D collaborations with universities and testing institutions allow rapid material development and prototyping to solve unique sealing challenges.
Applications and Benefits
Polypac rod seals are ideal for construction equipment, mobile hydraulics, industrial presses, marine systems, and agricultural machinery. Benefits include reduced downtime, improved energy efficiency via lower friction, extended service intervals, and reliable sealing under pressure reversals and dynamic rod misalignment.
Why Choose Polypac
Founded in 2008, Polypac combines scientific materials expertise with decades of sealing experience. We offer OEM partnerships, volume production, rapid sampling, and quality-assured supply chains. Choose Polypac for engineered rod seal solutions that improve system reliability and lower total cost of ownership.
Get Started
Contact Polypac to specify your rod seal for hydraulic cylinders—provide operating conditions and dimensions and we will recommend materials, profiles, and testing protocols to match your application.
rod seal for hydraulic cylinders Display
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.
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.
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 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.
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