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NBR O-Ring Solutions by Polypac

NBR O-Ring Solutions by Polypac

Why choose NBR O-Ring?

NBR O-Ring (nitrile rubber) is the industry workhorse for oil and hydraulic sealing thanks to its excellent resistance to petroleum-based oils, fuels and many hydraulic fluids. NBR offers a balanced profile of mechanical strength, abrasion resistance and cost-efficiency, making it ideal for dynamic and static sealing in pumps, valves and actuators.

Materials & Performance

Polypac manufactures NBR O-rings in a wide range of hardnesses and compound formulations to match temperature, pressure and media requirements. Our material development leverages decades of research—ensuring low compression set, good elasticity and stable performance across -40°C to +120°C depending on compound. All formulations are tested for oil swell, tensile strength and aging.

Custom Manufacturing & Quality

From our 10,000+ sqm campus and advanced production line, Polypac delivers custom NBR O-ring sizes and specialty compounds for special working conditions. Our factory-grade molding, post-curing and automated inspection systems ensure dimensional accuracy and repeatable sealing performance. We maintain ISO-aligned quality control and long-term R&D partnerships with universities and institutes.

Applications & Industries

NBR O-rings from Polypac serve automotive, hydraulic equipment, oilfield tools, industrial compressors and general machinery. Typical applications include oil seals, rod and piston seals, and static flange interfaces where oil resistance and mechanical reliability are required. We recommend application-specific compound selection to maximize seal life.

Why Polypac?

Founded in 2008, Polypac combines deep PTFE heritage with broad elastomer expertise. As one of China’s leading seal manufacturers, we offer flexible MOQ, fast prototyping, and full technical support—from material selection to installation guidance. Choose Polypac for engineered NBR O-Rings that deliver consistent sealing, long service life and cost-effective performance.

NBR O-Ring Display

FAQ:

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 is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

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.

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.

Table of Contents

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NBR O-Ring Solutions by Polypac
Why choose NBR O-Ring?
Materials & Performance
Custom Manufacturing & Quality
Applications & Industries
Why Polypac?
NBR O-Ring Display

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