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Polypac Vented Step Seal — Engineered Hydraulic Sealing Solutions

Vented Step Seal Solutions by Polypac

Overview

The Vented Step Seal from Polypac is engineered for demanding hydraulic and oil sealing applications where fluid venting, pressure equalization and low friction are critical. Our vented step design reduces extrusion and pressure trapping while maintaining a consistent sealing lip contact, delivering improved stability and longer service life compared with conventional seals.

Materials & Customization

Polypac offers Vented Step Seals in a wide range of materials, including filled PTFE variants (bronze, carbon, graphite, MoS2, glass) and elastomers such as NBR, FKM, silicone, EPDM and FFKM. With an in-house rubber ring and O-ring factory covering over 10,000 m² and advanced production lines, we provide tailored solutions for temperature, chemical exposure and abrasive or high-pressure environments.

Performance & Applications

Vented Step Seals are ideal for hydraulic cylinders, rod and piston applications, mobile equipment and industrial machinery. The vented step geometry minimizes friction and stick-slip, improves rod retraction, and helps vent trapped air or fluid for smoother operation under dynamic loads and varying temperatures.

Quality Assurance & Testing

Quality is core to Polypac. Our factory features industry-leading production and testing equipment, and we maintain long-term R&D partnerships with universities and research institutions. Every Vented Step Seal undergoes dimensional verification, material analysis and performance testing to meet strict durability and leakage criteria.

Why Choose Polypac

As a scientific and technical hydraulic seal manufacturer founded in 2008, Polypac combines material science expertise with manufacturing scale. We deliver fast prototyping, competitive lead times and custom sealing solutions for special working conditions—backed by global experience and local support.

Get Started

Contact Polypac to specify your Vented Step Seal requirements, request samples or arrange testing. Our team will help you select the right material, tolerance and geometry to optimize sealing performance and total cost of ownership.

Vented Step Seal Display

FAQ:

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.

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.

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.

Table of Contents

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Vented Step Seal Solutions by Polypac
Overview
Materials & Customization
Performance & Applications
Quality Assurance & Testing
Why Choose Polypac
Get Started
Vented Step Seal Display

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