Zero Leakage Hydraulic Seal — Polypac High-Performance Solution

Polypac Zero Leakage Hydraulic Seal provides reliable, long-lasting sealing for demanding hydraulic systems. Advanced materials, precision manufacturing, and custom options ensure optimal performance and peace of mind.
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Product Information

Product Overview

The Polypac Zero Leakage Hydraulic Seal is engineered to deliver dependable, long-term sealing for hydraulic cylinders and high-pressure systems. Built from industry-proven materials and manufactured with tight tolerances, this seal minimizes leakage, reduces maintenance, and extends service life even in harsh conditions.

Key Features

Zero Leakage Performance

Designed for tight contact and stable sealing under pressure, the Polypac Zero Leakage Hydraulic Seal prevents fluid escape and keeps systems efficient. Its design reduces the risk of contamination and maintains consistent performance over time.

Durable Materials

We use advanced materials including filled PTFE variants (bronze, carbon, graphite, MoS₂, glass) and a wide range of elastomers such as NBR, FKM, silicone, EPDM, and FFKM. These materials provide excellent resistance to wear, chemicals, temperature, and pressure.

Precision Manufacturing

Polypac’s factory spans over 10,000 square meters with 8,000 square meters of production space. Our modern production and testing equipment ensure consistent quality and tight dimensional control for every batch.

Benefits

  • Reliable sealing with minimal leakage risk
  • Low friction for smooth cylinder movement
  • Long service life, reducing downtime and costs
  • Wide material options to match specific fluids and temperatures
  • Custom sizes and designs for special working conditions

Applications

Ideal for hydraulic cylinders, mobile hydraulics, industrial presses, construction equipment, and any application requiring dependable high-pressure sealing. Polypac seals work well in extreme temperatures, contaminated environments, and continuous-duty systems.

Why Choose Polypac?

Founded in 2008, Polypac combines deep sealing expertise with strong R&D partnerships with universities and research institutes. As one of China’s leading seal manufacturers, we offer comprehensive testing, strict quality control, and tailored solutions to meet unique operational needs.

Install & Maintain

Polypac seals are designed for straightforward installation. Follow standard installation practices, use correct gland dimensions, and perform routine inspections to maximize lifetime. For custom guidance, our technical team provides drawings, material recommendations, and support.

Contact Polypac for samples, specifications, and custom sealing solutions to achieve true zero leakage performance in your hydraulic systems.

Product Images

  • DSJR Rod Seals

Frequently Asked Questions

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 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.
Why did my O-ring fail prematurely?
Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.
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.

If you have another questions, please feel free to contact 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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Tags
excavator piston seals
excavator piston seals
Metric Piston Seal Kits
Metric Piston Seal Kits
Cylinder Guide Ring
Cylinder Guide Ring
PTFE Encapsulated O-Rings
PTFE Encapsulated O-Rings
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Whether you need product details, technical support, or a custom solution, we’re here to assist.

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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How Can We Help You?

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

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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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