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Double Lip Rod Seal - Precision Hydraulic Sealing by Polypac

Double Lip Rod Seal - High-Performance Hydraulic Sealing

Product Overview

The Double Lip Rod Seal is engineered to provide superior sealing on reciprocating rods in hydraulic and pneumatic cylinders. Featuring a primary sealing lip for pressure retention and a secondary lip for contamination exclusion, the Double Lip Rod Seal offers a balanced solution for systems requiring low leakage, reduced friction, and long-term reliability.

Design & Materials

Polypac manufactures Double Lip Rod Seal designs in a wide range of materials, including filled PTFE variants (bronze, carbon, graphite, MoS₂, glass) and elastomers like NBR, FKM, silicone, EPDM, and FFKM. Tailored material selection ensures compatibility with hydraulic fluids, temperatures, and surface speeds for optimal wear resistance and sealing performance.

Performance Benefits

Double Lip Rod Seal construction reduces internal leakage while preventing external contamination. The dual-lip geometry improves pressure distribution, minimizes friction and stick-slip, and extends service intervals—critical advantages for mobile hydraulics, industrial presses, and offshore equipment.

Customization & Manufacturing Capacity

Polypac specializes in customized sealing solutions. Our 10,000+ m² facility, 8,000 m² production space, and advanced equipment support rapid prototyping, custom compounds and tight-tolerance molding. We partner with universities and research institutes to develop seals tailored to extreme or unique working conditions.

Quality Control & Testing

Every Double Lip Rod Seal undergoes rigorous dimensional, material and performance testing. Polypac applies industry-leading inspection and accelerated life testing protocols to ensure consistent sealing performance under pressure, temperature variation and contamination exposure.

Applications & Industries

Ideal for hydraulic cylinders in construction machinery, agriculture, material handling, marine and industrial automation, our Double Lip Rod Seal meets the demands of heavy-duty and precision systems. Custom designs can address special surface finishes, shaft tolerances and fluid chemistries.

Why Choose Polypac

With decades of PTFE expertise and a broad elastomer portfolio, Polypac combines material science, manufacturing scale and R&D collaboration to deliver reliable Double Lip Rod Seal solutions. Contact Polypac for samples, drawings, and engineering support to optimize seal life and system efficiency.

Double Lip Rod Seal Display

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.

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.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

Table of Contents

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Double Lip Rod Seal - High-Performance Hydraulic Sealing
Product Overview
Design & Materials
Performance Benefits
Customization & Manufacturing Capacity
Quality Control & Testing
Applications & Industries
Why Choose Polypac
Double Lip Rod Seal Display

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