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Buna-N O-Ring Kit | Polypac NBR Seals & Custom Solutions

Buna-N O-Ring Kit by Polypac: Reliable NBR Sealing Solutions

Product Overview

Polypac's Buna-N O-Ring Kit provides a comprehensive selection of NBR (Buna-N) O-rings engineered for oil, fuel and hydraulic applications. Each kit contains commonly used sizes and cross-sections to support assembly, maintenance and field repairs. Designed for professionals, the kits balance immediate availability with the option for rapid customization.

Key Features & Material Benefits

Buna-N (NBR) is prized for excellent resistance to petroleum oils, hydraulic fluids and good wear properties. Typical operating temperatures range from -40°C to +120°C depending on compound. Our Buna-N O-Ring Kit emphasizes tear resistance, compression set control and consistent hardness—critical for long-term sealing performance in dynamic and static joints.

Applications & Compatibility

These kits are ideal for hydraulic systems, automotive fuel systems, industrial pumps, compressors and general-purpose sealing. The Buna-N O-Ring Kit suits environments with oil exposure, moderate heat and mechanical stress. For aggressive chemicals or extreme temperatures, Polypac offers alternative elastomers such as FKM and FFKM.

Customization & Quality Assurance

Polypac manufactures custom rubber rings and O-rings in a 10,000 m² facility with 8,000 m² production space and advanced production/testing equipment. We provide custom diameters, AS568 sizes, durometers and blended compounds on demand. Every batch undergoes rigorous testing to ensure dimensional accuracy and material consistency.

Why Choose Polypac

Founded in 2008, Polypac began with filled PTFE seals and has expanded into a full range of O-rings including NBR, FKM, silicone, EPDM and FFKM. As a leading seal manufacturer and oil seal supplier, we work with universities and research institutions to advance sealing materials and bespoke solutions for special working conditions.

Ordering & Support

Polypac offers ready-made Buna-N O-Ring Kits for maintenance teams and tailored production runs for OEMs. Contact our technical sales team for material recommendations, custom quotes and fast delivery options. Choose Polypac for engineered sealing reliability and responsive support.

Buna-N O-Ring Kit Display

FAQ:

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.

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.

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 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.

Table of Contents

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Buna-N O-Ring Kit by Polypac: Reliable NBR Sealing Solutions
Product Overview
Key Features & Material Benefits
Applications & Compatibility
Customization & Quality Assurance
Why Choose Polypac
Ordering & Support
Buna-N O-Ring Kit Display

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