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Polypac Hydraulic Seal Solutions — Precision Seals for Demanding Applications

Polypac Hydraulic Seal Solutions

Overview

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier specializing in seal production, sealing material development, and customized sealing solutions for special working conditions. Since 2008, we have focused on robust Hydraulic Seal design and manufacturing, serving industries that require high reliability under pressure, temperature, and chemical exposure.

Advanced Manufacturing & Capacity

Our custom rubber ring and O-ring factory covers more than 10,000 square meters with 8,000 square meters of factory space. Polypac invests in state-of-the-art production and testing equipment to deliver consistent quality and scalable output. As one of China’s largest dedicated seal producers, we maintain long-term collaboration with universities and research institutes to stay at the forefront of sealing technology.

Material Expertise & Product Range

Beginning with filled PTFE seals (bronze-, carbon-, graphite-, MoS₂-, and glass-filled PTFE), Polypac now offers O-rings and Hydraulic Seal products in NBR, FKM, silicone, EPDM, and FFKM. This material breadth allows tailored solutions for hydraulic cylinders, pumps, valves and rotary applications—optimizing wear resistance, low friction, and chemical compatibility.

Customization, Testing & Special Conditions

We specialize in custom seal geometry and compound formulation to meet unique pressure, temperature, and media challenges. Rigorous testing protocols and quality control ensure every Hydraulic Seal performs reliably in harsh environments. Custom development and rapid prototyping shorten time-to-market for critical projects.

Why Choose Polypac

Choose Polypac for proven expertise, comprehensive material selection, and scalable manufacturing. Our combination of R&D partnerships, advanced equipment, and two decades of industry experience delivers Hydraulic Seal solutions that reduce downtime and extend service life. Contact Polypac for consultation, samples, and custom sealing strategies tailored to your application.

Hydraulic Seal Display

FAQ:

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.

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.

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.

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.

Table of Contents

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Polypac Hydraulic Seal Solutions
Overview
Advanced Manufacturing & Capacity
Material Expertise & Product Range
Customization, Testing & Special Conditions
Why Choose Polypac
Hydraulic Seal Display

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