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Polypac Vented Step Seal — Reliable Low-Friction Hydraulic Seal

Polypac Vented Step Seal delivers pressure-balanced, low-friction sealing for hydraulic systems. Made from proven materials and customizable for harsh conditions, it reduces leakage and extends service life. Advanced production and testing ensure consistent quality.

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Product Description

Polypac Vented Step Seal — Overview

The Vented Step Seal from Polypac is designed for hydraulic cylinders that need reliable, low-friction sealing with superior pressure balance. Built for both standard and demanding environments, this seal minimizes leakage and wear while improving system efficiency.

Key Features

Pressure-balanced vented design reduces piston uplift and leakage.
Low friction construction improves response and reduces heat.
Available in PTFE-filled and elastomer-backed combinations for optimal performance.
Compatible with a wide range of fluids and working temperatures.

Why Choose Polypac?

Polypac is a technical seal manufacturer with over a decade of focused experience. Our 10,000+ m² facility and advanced production and testing equipment let us control quality at every step. We partner with universities and research institutes to continuously improve materials and designs, ensuring the Vented Step Seal meets modern hydraulic demands.

Benefits for Your Application

Whether for mobile hydraulics, industrial presses, or specialty equipment, the Vented Step Seal offers clear advantages:

Longer service life — reduced wear and consistent sealing under pressure.
Improved efficiency — lower friction reduces energy loss and temperature rise.
Customizable — choose materials like bronze-filled PTFE, carbon PTFE, or elastomers such as NBR, FKM, or FFKM for specific fluids and temperatures.
Easy retrofitting — designed for straightforward installation in common piston grooves.

Custom Solutions & Quality Assurance

Polypac offers tailored designs and material combinations to suit special working conditions. Every seal is produced under strict quality control and tested to industry standards, so you get consistent performance and reliability.

Get Started

Contact Polypac for technical advice, samples, or a custom quote. Upgrade your hydraulic systems with a Vented Step Seal that delivers better sealing, longer life, and measurable cost savings.

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Question you may concern

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.

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.

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.

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PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

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