Polypac O-Ring Washer Solutions for Hydraulic & Oil Seal Applications

Polypac O-Ring Washer Solutions

Polypac specializes in engineered O-Ring Washer products designed for hydraulic and oil seal applications. As a scientific and technical seal manufacturer, we deliver high-precision rubber rings and O-rings that combine long service life, chemical resistance, and low friction. Our O-Ring Washer category addresses static and dynamic sealing challenges across automotive, industrial hydraulics, and specialty equipment markets.

Material Options and Performance

Choose from a broad range of elastomers and composites: NBR for fuel and oil resistance, FKM for high-temperature and chemical resilience, Silicone for extreme temperature flexibility, EPDM for weather and steam resistance, and FFKM for the most aggressive chemical environments. We also provide advanced PTFE-filled options developed from our roots in filled PTFE technology to reduce wear and friction when needed.

Custom Manufacturing Capacity

Polypac's custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space, supporting high-volume runs and precision bespoke parts. Our manufacturing systems and tooling enable tight tolerances, consistent cross-sections, and repeatable quality for O-Ring Washers in metric and imperial sizes as well as non-standard geometries.

Quality Assurance & Testing

We employ industry-leading testing equipment and protocols to validate hardness, compression set, tensile strength, and leak integrity. Long-term cooperation with universities and research institutes ensures our material formulations and testing methods remain at the cutting edge, guaranteeing reliable sealing performance under special working conditions.

Applications and Benefits

Polypac O-Ring Washers serve hydraulic cylinders, pumps, valves, and rotating shaft seals, providing superior sealing, reduced maintenance, and extended equipment uptime. Benefits include enhanced durability, tailored chemical compatibility, and lower frictional losses—critical for energy efficiency and operational safety.

Why Choose Polypac

Founded in 2008, Polypac combines decades of PTFE and elastomer expertise with award-winning seal design, fast prototyping, and OEM collaboration. Whether you need standard O-Ring Washers or custom sealing solutions for extreme environments, Polypac delivers engineered performance backed by rigorous testing and responsive technical support.

O-Ring Washer Display

FAQ:
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.

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.

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.

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Whether you need product details, technical support, or a custom solution, we’re here to assist.

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