High-Performance Rod Seals for Excavator Cylinders | Polypac
Rod Seals for Excavator Cylinders — Polypac Hydraulic Sealing Solutions
Precision-Engineered Performance
Polypac rod seals for excavator cylinders are engineered to deliver reliable sealing under extreme pressure, high side loads and contaminated working environments. Designed for minimal friction and consistent sealing contact, our rod seals improve cycle life, reduce energy loss, and prevent oil leakage — critical for excavators operating in construction, mining and heavy civil works.
Advanced Materials and Formulations
Leveraging our expertise in filled PTFE and elastomers, Polypac offers rod seals in bronze-filled PTFE, carbon-filled PTFE, MoS₂-filled PTFE, plus elastomeric compounds including NBR, FKM, EPDM, silicone and FFKM. These tailored materials resist extrusion, thermal aging and chemical attack, ensuring compatibility with common hydraulic fluids and extreme temperature ranges encountered by excavator cylinders.
Custom Solutions for Special Conditions
With a 10,000+ m² manufacturing footprint and one of the most advanced testing suites in the industry, Polypac provides bespoke rod seals for excavator cylinders to meet unique application demands. We collaborate with universities and research institutes to develop seals for abrasive slurry, high-frequency cycles, and heavy-duty side loads, delivering optimized profiles, back-up rings and compound blends on request.
Manufacturing Quality and Field-Proven Reliability
Founded in 2008, Polypac combines precision molding, automated inspection and rigorous endurance testing to guarantee consistent quality. Our rod seals for excavator cylinders undergo dimensional, material and fatigue testing so you receive components that perform reliably in the field, lowering downtime and maintenance costs for fleet operators and OEMs.
Specification Support and Aftermarket Service
Polypac offers technical support for seal selection, rapid prototyping and volume production. We provide datasheets, CAD profiles and on-site consultation to simplify integration into existing cylinder designs. Choose Polypac for engineered rod seals for excavator cylinders that balance performance, longevity and cost-effectiveness — request a quote or sample today.
rod seals for excavator 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.
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.
What is the difference between a static seal and a dynamic seal?
A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.
What is the purpose of the metal spring in a rotary shaft seal?
The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.
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