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

English

Turkish

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Single-Acting Piston Seal

Polypac Single-Acting Piston Seal delivers dependable sealing for hydraulic cylinders. Engineered with advanced materials and custom options, it ensures long life, low friction, and reliable performance across diverse working conditions.

Get a free quote

Product Description

Overview

The Polypac Single-Acting Piston Seal is designed to provide reliable sealing for hydraulic cylinders that require pressure on one side of the piston. Built with proven materials and precision manufacturing, this seal minimizes leakage, reduces wear, and keeps systems running smoothly in a wide range of applications.

Why Choose Polypac Piston Seals

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier with over a decade of focused experience. Our factory covers more than 10,000 m², with 8,000 m² of production space and advanced testing equipment. Since 2008 we have evolved from filled PTFE seals to a broader range including elastomer O-rings in NBR, FKM, silicone, EPDM and FFKM. We work closely with universities and research institutes to ensure quality and innovation.

Key Advantages

Reliable sealing for single-acting cylinders
Low friction for smooth piston movement
High wear and extrusion resistance
Available in a variety of materials to match fluid and temperature needs
Precision manufacturing for consistent performance

Materials & Custom Options

Polypac offers a wide selection of materials to suit different working conditions. Standard and specialty materials include PTFE variants (bronze-filled, carbon-filled, graphite, MoS₂-filled, and glass-filled) and elastomers such as NBR, FKM, silicone, EPDM, and FFKM. Custom compounds and sizes are available for extreme temperatures, aggressive fluids, or high-speed applications.

Applications

Common uses include construction machinery, mobile hydraulics, industrial presses, and any system that requires dependable single-sided pressure sealing. Our seals are suitable for both replacement and OEM projects.

Quality & Support

Every Polypac seal is manufactured and tested to industry standards. We provide technical support to select the right material and profile for your application, helping you reduce downtime and extend service life.

Contact Polypac to discuss custom sealing solutions and get a reliable Single-Acting Piston Seal tailored to your needs.

Product Images

Frequently Asked Questions

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

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.

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.

Request A Quote

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.

UH Series U-Cup | Wear-Resistant Polyurethane Seal with Anti-Extrusion Ring

Polypac’s UH Series U-Cup is a wear-resistant polyurethane piston U-Cup featuring an anti-extrusion ring. Designed as a single-acting piston seal, it ensures high durability and reliable sealing performance in hydraulic applications. Ideal for long-lasting, efficient operation.

UH Series U-Cup | Wear-Resistant Polyurethane Seal with Anti-Extrusion Ring