Rod Seal Solutions for Excavator Cylinders — Polypac
Rod Seal for Excavator Cylinders — Overview
Polypac supplies High Quality rod seal for excavator cylinders engineered to withstand heavy-duty shock loads, abrasive particles, and wide temperature swings. Built for long life and minimal leakage, our rod seals ensure smooth cylinder retraction and extended equipment uptime across construction and mining fleets.
Materials & Performance Characteristics
We manufacture rod seals from a broad range of compounds including filled PTFE (bronze, carbon, graphite, MoS₂, glass), NBR, FKM, silicone, EPDM and FFKM. These materials are selected to balance friction, extrusion resistance, and chemical compatibility — delivering reliable sealing performance in oil, hydraulic fluids and contaminated environments.
Custom Design for Special Working Conditions
Polypac specializes in custom rod seal for excavator cylinders tailored to specific bore sizes, rod finishes and operating pressures. Our in-house engineering team collaborates with clients to optimize lip geometry, backup rings and energizers for leak-free sealing under shock and misalignment.
Manufacturing Capacity & Advanced Equipment
With over 10,000 m² site area and 8,000 m² factory space, Polypac combines high-capacity production with precise molding and machining. Our advanced production and testing equipment supports both prototype runs and large OEM orders while maintaining tight tolerances and consistent quality.
Testing, Quality Control & Research Partnerships
Every rod seal for excavator cylinders undergoes comprehensive testing—dimensional, endurance, friction and aging tests—to ensure field reliability. Founded in 2008, we maintain long-term R&D collaborations with universities and institutes to refine sealing materials and technologies.
Applications & Benefits
Ideal for excavators, hydraulic breakers, cranes and heavy machinery, Polypac rod seals reduce downtime, lower maintenance costs and protect cylinder internals from contamination. Our sealing solutions improve oil retention and provide consistent performance in extreme work sites.
Why Choose Polypac
As a scientific and technical hydraulic seal manufacturer and oil seal supplier, Polypac delivers engineering-led solutions, rapid customization and scalable production. Contact us for sample testing, material recommendations and OEM partnerships for rod seal for excavator cylinders.
rod seal for excavator cylinders Display
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.
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.
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