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Bidirectional Hydraulic Seal Solutions by Polypac

Bidirectional Hydraulic Seal Solutions by Polypac

Overview

Polypac specializes in high-performance Bidirectional Hydraulic Seal systems engineered for valves, cylinders, rams, and actuators that require leak-free operation in both directions. Leveraging more than a decade of material science and production experience, our seals combine proven PTFE compounds and High Quality elastomers to deliver consistent sealing under reversing pressure loads.

Design Advantages

Our Bidirectional Hydraulic Seal designs provide balanced sealing force, low friction, and excellent extrusion resistance. By optimizing cross-sections and material pairings (bronze-filled PTFE, carbon-filled PTFE, MoS₂-filled PTFE, NBR, FKM, EPDM, silicone, FFKM), Polypac seals reduce stick-slip, improve cycle life, and maintain performance across wide temperature and pressure ranges.

Material & Customization

From filled PTFE for abrasive environments to specialty elastomers for dynamic reciprocation, Polypac offers tailored material selection and custom tooling. Our custom rubber ring and O-ring facility (over 10,000 m²) supports bespoke formulations and profiles to meet specific media compatibility, temperature, and wear requirements for Bidirectional Hydraulic Seal applications.

Manufacturing & Quality

Polypac employs advanced production lines and industry-leading testing equipment to ensure repeatable quality. Each Bidirectional Hydraulic Seal undergoes dimensional inspection, friction and leakage testing, and endurance trials. Collaboration with universities and research institutes supports continuous improvement and traceable material validation.

Applications

Ideal for mobile hydraulics, construction equipment, industrial presses, subsea actuators, and aerospace systems, our Bidirectional Hydraulic Seal range is designed for demanding environments—high pressure, frequent direction changes, contamination exposure, and extreme temperatures.

Why Choose Polypac

Founded in 2008, Polypac combines R&D depth with large-scale manufacturing capacity to deliver reliable, cost-effective bidirectional sealing solutions. We offer rapid prototyping, OEM partnership, and full technical support to help you select the optimal Bidirectional Hydraulic Seal for performance, longevity, and total cost of ownership.

Bidirectional Hydraulic Seal Display

FAQ:

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

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.

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.

Table of Contents

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Bidirectional Hydraulic Seal Solutions by Polypac
Overview
Design Advantages
Material & Customization
Manufacturing & Quality
Applications
Why Choose Polypac
Bidirectional Hydraulic Seal Display

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