Polypac Heavy Equipment Cylinder Repair

Polypac provides durable hydraulic seals and O-rings for heavy equipment cylinder repair. Our custom PTFE and rubber seals deliver leak-free performance, long life, and reliable operation across harsh conditions.
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Product Information

Product Overview

Polypac Heavy Equipment Cylinder Repair seals are designed to restore and enhance the performance of hydraulic cylinders used in excavators, loaders, cranes, and other heavy machinery. With decades of material expertise and precision manufacturing, our seals reduce leakage, improve uptime, and extend component life.

Key Benefits

  • Leak-free operation under high pressure and heavy load.
  • Excellent wear and abrasion resistance for long service life.
  • Stable performance across wide temperature and chemical environments.
  • Quick turnaround with custom sizes and rapid prototyping.

Materials and Compatibility

We offer a broad range of materials to match your equipment and working conditions. Common choices include bronze-, carbon-, graphite- and MoS2-filled PTFE for sliding parts, and elastomers like NBR, FKM, EPDM, silicone, and FFKM for O-rings and rubber rings. Polypac selects materials to balance friction, resilience, and chemical resistance so your cylinders run reliably.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier. Our custom rubber ring and O-ring factory covers over 10,000 square meters, with 8,000 square meters of production space and advanced testing equipment. Founded in 2008, we began with filled PTFE seals and have grown into one of China’s largest dedicated seal developers.

Quality and Customization

  • Advanced production and testing ensure consistent performance.
  • Long-term cooperation with universities and research institutes keeps our products at the cutting edge.
  • Tailored sealing solutions for special working conditions and hard-to-fit cylinders.

Applications

Our seals are used in construction machines, mining equipment, agricultural machinery, and industrial hydraulic systems. They work well in dusty, wet, corrosive, or high-temperature environments.

Trust and Support

Polypac provides technical support, installation guidance, and reliable supply for OEM and aftermarket needs. Choose Polypac Heavy Equipment Cylinder Repair seals to reduce downtime, protect your investment, and keep heavy equipment working with confidence.

Product Images

  • GST-PHE01
  • GST-PHE01
  • GST-PHE01

FAQ

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.
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 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.
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.
Get In Touch With Us
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Polypac Industrial Technology Co.,Ltd
No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.
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piston seals manufacturer​
piston seals manufacturer​
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Your privacy matters to us. We handle your data securely, in compliance with international quality and safety certifications.

With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.

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Whether you need product details, technical support, or a custom solution, we’re here to assist.

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With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.

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