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

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dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Metric Piston Seals – Reliable Hydraulic Sealing Solutions

Polypac Metric Piston Seals deliver precision, low-friction sealing for hydraulic cylinders. Manufactured with advanced materials and strict testing, they offer long life, adaptability to harsh conditions, and custom options to meet metric specifications.

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Product Information

Overview

Polypac Metric Piston Seals are engineered to provide dependable sealing in hydraulic cylinders and linear actuators. Designed for metric grooves and dimensions, these piston seals ensure stable performance, low leakage, and long service life across a wide range of pressures and temperatures.

Key Features

Precision for Metric Applications

Each seal is manufactured to tight metric tolerances, guaranteeing proper fit and consistent operation in metric cylinders and pistons.

Durable Materials

Polypac uses high-quality materials, including filled PTFE variants (bronze, carbon, graphite, MoS₂, glass) and elastomers like NBR, FKM, EPDM, silicone, and FFKM. This mix offers low friction, chemical resistance, and wear resistance suited to different media and temperatures.

Low Friction and Long Life

Advanced material formulations and precision machining reduce friction and wear, improving energy efficiency and extending maintenance intervals.

Customization and Quality Assurance

Custom Solutions

Polypac specializes in custom seals for special working conditions. Whether you need unique compound formulations, metric sizing, or design changes for extreme pressure or temperature, Polypac can deliver tailored solutions.

Manufacturing & Testing

With a 10,000+ m² facility and 8,000 m² production area, Polypac uses industry-leading production and testing equipment. We maintain long-term collaborations with universities and research institutes to ensure product reliability and continuous improvement.

Applications

Common uses include hydraulic cylinders in construction, agriculture, mobile equipment, industrial machinery, and any system requiring reliable metric piston sealing. Suitable for both new equipment and aftermarket replacements.

Installation & Maintenance Tips

Install seals into clean grooves with the correct tools, avoid sharp edges, and lightly lubricate the seal before assembly. Regular inspections and correct groove dimensions will maximize seal life.

Why Choose Polypac?

Polypac combines decades of seal expertise, advanced materials, and precision production. Our metric piston seals offer proven performance, customizable options, and robust quality control—giving you confidence in demanding hydraulic applications.

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FAQ

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.

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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.

If you don’t find your answer, please E-mail us and we’ll be happy to help you out.

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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.

FSK-X Series Piston Seal | Enhanced Performance with Special Profile

Polypac’s FSK-X Series Piston Seal features a special profile for enhanced performance in mining cylinders and press machines. Designed as High Quality metric piston seals, they ensure superior sealing, durability, and reliability in heavy-duty applications. Optimize your equipment with FSK-X today.

FSK-X Series Piston Seal | Enhanced Performance with Special Profile