dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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Polypac Special Profile Seal Products

Special Profile Seal Solutions by Polypac

Overview

Polypac specializes in advanced Special Profile Seal designs for hydraulic, rotary and reciprocating systems. Combining decades of sealing expertise with scientific research, Polypac engineers seals that meet tight tolerances, complex profiles and extreme operating conditions. Our product range is ideal for OEMs and maintenance teams seeking reliable, long-life sealing solutions.

Materials and Customization

We produce Special Profile Seal options in filled PTFE variants originally developed by Polypac, including bronze-filled, carbon-filled, graphite, MoS2-filled and glass-filled PTFE, plus elastomer O-ring materials such as NBR, FKM, silicone, EPDM and FFKM. Each material is selected and formulated to resist abrasion, chemical attack, high temperature and low friction requirements, with bespoke compound development for unique environments.

Performance and Applications

Special Profile Seal geometries are engineered for superior leakage control, low friction and long service intervals. Typical applications include hydraulic cylinders, pumps, valves, heavy machinery and rotating shafts in automotive, construction, oil and gas and industrial hydraulics. Polypac seals deliver enhanced efficiency, reduced downtime and predictable lifecycle performance under pressure, speed and contamination challenges.

Manufacturing and Quality Assurance

Polypac operates a custom rubber ring and O-ring factory covering more than 10,000 square meters with an 8,000 square meter production space and industry-leading production and testing equipment. Founded in 2008, we maintain long-term partnerships with universities and research institutes to ensure continuous improvement, rigorous testing and ISO-aligned quality control for every Special Profile Seal produced.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier committed to tailored sealing solutions. From prototype to mass production, we provide rapid tooling, flexible run sizes and expert support to optimize sealing performance for special working conditions. Choose Polypac for precision Special Profile Seal design, material innovation and dependable manufacture that protects your systems and lowers total cost of ownership.

Special Profile Seal Display

FAQ:

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.

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 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 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.

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.

Table of Contents

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Special Profile Seal Solutions by Polypac
Overview
Materials and Customization
Performance and Applications
Manufacturing and Quality Assurance
Why Choose Polypac
Special Profile Seal Display

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