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Polypac Single-Acting Seal — Reliable Hydraulic Sealing Solution

Polypac Single-Acting Seal provides dependable sealing for hydraulic cylinders with advanced materials, strict testing, and customizable sizes. Trusted since 2008 for quality and performance.

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Product Information

Product Overview

The Polypac Single-Acting Seal is designed to deliver reliable sealing in hydraulic cylinders where pressure is applied to one side only. Engineered for steady performance, it prevents fluid leakage, reduces maintenance, and extends equipment life. Suitable for industrial machinery, construction equipment, and agricultural hydraulics.

Why Choose Polypac Single-Acting Seals

Polypac combines decades of sealing expertise with modern production facilities to offer seals you can trust. Our seals are produced in a 10,000+ m² facility with advanced testing and quality control. We work with universities and research institutions to ensure materials and designs meet real-world demands.

Durable Materials

We offer Single-Acting Seals in a variety of materials to match working conditions: PTFE compounds (including bronze-, carbon-, and graphite-filled), NBR, FKM, EPDM, silicone, and high-performance FFKM. Material choice helps balance wear resistance, temperature tolerance, and chemical compatibility.

Custom Sizes & Solutions

Polypac supports custom dimensions and special designs for unusual or harsh environments. From standard metric sizes to bespoke shapes, our production line and skilled engineers ensure precise fits and rapid prototyping.

Performance & Reliability

Single-Acting Seals from Polypac are optimized for minimal friction and long service life. Each seal undergoes rigorous inspection and testing to meet industry standards. Our early focus on filled PTFE and ongoing R&D ensures seals perform well under pressure, abrasion, and temperature changes.

Applications

Common uses include hydraulic cylinders, pumps, and actuators in construction, agriculture, material handling, and industrial machinery. They are ideal where movement is unidirectional and a dependable seal is crucial.

About Polypac

Founded in 2008, Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier specializing in material development and customized sealing solutions. With advanced equipment and long-term research partnerships, we deliver high-quality seals tailored to your needs.

Contact Polypac for product specifications, material advice, and custom quotations to ensure the right Single-Acting Seal for your application.

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Q&A

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.

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.

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.

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.

If you have any other questions, please write email to us or call us , we will reply you ASAP.

Get in Touch

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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