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

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Polypac Metric Piston Seal Kits

Polypac Metric Piston Seal Kits deliver reliable, precision-fit hydraulic sealing for cylinders. Made from proven materials and backed by rigorous testing and customization options for special conditions.

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Product Information

Overview

Polypac Metric Piston Seal Kits provide a complete sealing solution for hydraulic cylinders. Each kit includes piston seals, backup rings, wipers, and O-rings selected for compatibility and long service life. Designed for easy installation and dependable performance, these kits suit repair shops, system integrators, and OEMs needing consistent, metric-sized sealing components.

Why Choose Polypac?

Polypac is a technical seal manufacturer with a strong focus on material science and custom solutions. Our factory covers over 10,000 m² and houses advanced production and testing equipment. Since 2008, we have developed a wide range of seals—from filled PTFE types to NBR, FKM, silicone, EPDM, and FFKM O-rings. Long-term partnerships with universities and research institutes ensure continuous improvement and reliable product performance.

Trusted Materials

Our metric piston seal kits are made from industry-proven materials, including PTFE composites and elastomers tailored to pressure, speed, and temperature demands. This ensures low friction, excellent wear resistance, and strong chemical compatibility.

Key Features

Complete kit: piston seals, backup rings, wipers, and O-rings
Available in a wide range of metric diameters and cross-sections
Multiple material options: bronze/carbon/graphite-filled PTFE, NBR, FKM, EPDM, silicone, FFKM
Precision manufacturing for tight tolerances and reliable sealing
Custom sizes and compounds for special working conditions

Applications

Ideal for hydraulic cylinders in construction, agriculture, material handling, and industrial machinery. The kits work well for maintenance, rebuilds, and new designs requiring metric seals.

Quality and Support

Every kit is produced under strict quality control and tested to meet performance expectations. Polypac offers technical support for selection and installation, plus custom formulations for extreme temperatures, aggressive fluids, or high-pressure systems. Fast delivery and consistent stock levels help reduce downtime.

Ordering and Customization

Choose standard metric kits or request a custom package. Provide bore diameter, rod size, pressure and temperature ranges, and fluid type to get a tailored solution. Polypac’s experienced team will recommend the best material and design for your application.

Polypac Metric Piston Seal Kits combine proven materials, precision manufacturing, and expert support to keep hydraulic systems running reliably.

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Question you may concern

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.

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.

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.

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.

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.

DAQ Series Piston Seal | Urethane U-Cup Kit for Heavy-Duty Applications

Polypac’s DAQ Series Piston Seal Kit features durable urethane U-cups with backup rings, designed for heavy-duty applications. Ideal for metric piston seal kits, it ensures optimal sealing performance and long-lasting reliability in demanding industrial environments.

DAQ Series Piston Seal | Urethane U-Cup Kit for Heavy-Duty Applications