AN6226-53 U-Cup Seal Buna-N NBR 70 1-1/4" I.D. x 1-5/8" O.D. x 3/16" C/S

AN6226 Series U-Cup Seals - Buna-N 70 Durometer - AN6226-53
Dimensions: 1-1/4" I.D. x 1-5/8" O.D. x 3/16" C/S
Material: Standard 70 Durometer Buna-N (Nitrile)

The AN6226 Series U-Cups, made from 70 durometer Buna-N (Nitrile), conform to Army-Navy specification AN6226, ensuring performance and reliability in a wide range of sealing applications. This material offers excellent resistance to oils and fuels, making it ideal for industrial, automotive, and military systems that require robust, durable seals.

Key Features:

• Pressure Rating: Rated to withstand pressures of up to 500 PSI, making it suitable for high-pressure applications in hydraulic and pneumatic systems.
• Oil and Fuel Resistant: The Buna-N compound provides excellent resistance to petroleum-based oils, fuels, and greases, ensuring long-lasting sealing in harsh environments.
• Industry Standard Compatibility: Part-numbered as AN6226-53, this product adheres to the industry-standard AN numbering system, ensuring easy identification and interchangeability.
• Durable Performance: Designed to perform in demanding conditions, Buna-N offers resistance to wear and tear, ensuring long service life in applications involving oil and fuel exposure.

These AN6226-53 U-Cups are the perfect choice for sealing systems requiring high-performance elastomers, particularly in environments where oil and fuel resistance are critical. Used extensively in military, aerospace, automotive, and industrial applications, these U-cup seals provide reliable, leak-proof performance even under high pressure.

Standard Buna-N (Nitrile) 70 Durometer is a widely used elastomer due to its excellent resistance to oils, fuels, and various chemicals. Here’s a breakdown of its chemical resistance and common uses:

Chemical Resistance of Buna-N 70 Durometer:

1. Excellent Resistance To:
   • Petroleum-Based Oils and Fuels: Buna-N has exceptional resistance to gasoline, diesel, kerosene, and other petroleum-based lubricants, making it ideal for automotive and industrial seals.
   • Hydraulic Fluids: It performs well in hydraulic systems using mineral oil-based fluids, making it common in machinery and equipment seals.
   • Greases and Lubricants: Buna-N is resistant to various types of greases and oils, making it suitable for seals in rotating equipment and engine systems.
   • Aliphatic Hydrocarbons: Like propane, butane, and natural gas, which makes it a good choice for seals in gas handling equipment.
   • Water and Non-Polar Fluids: Suitable for water applications, though it performs best with oils and hydrocarbons.
2. Limited Resistance To:
   • Acids and Alkalis: It can resist weak acids and bases, but stronger chemicals can cause degradation over time.
   • Alcohols: Resistant to certain alcohols like methanol and ethanol, but extended exposure may lead to swelling.
   • Ozone and Weathering: Buna-N has only moderate resistance to ozone and weathering, which makes it less suitable for prolonged outdoor applications without protection.
3. Not Resistant To:
   • Aromatic Hydrocarbons: Such as benzene, toluene, and xylene, which can cause the material to degrade or swell significantly.
   • Ketones: Including acetone and MEK (Methyl Ethyl Ketone), which attack the structure of Buna-N and cause deterioration.
   • Strong Acids: Like nitric acid or concentrated sulfuric acid.
   • Chlorinated Hydrocarbons: Like trichloroethylene and perchloroethylene, which can cause Buna-N to break down.

Common Uses of Buna-N 70 Durometer:

1. Automotive and Aerospace:
   • Fuel and Oil Handling Seals: Buna-N is extensively used in fuel systems, gaskets, and seals in engines, transmission systems, and fuel tanks due to its excellent resistance to petroleum-based oils and fuels.
   • Hydraulic Seals: Used in hydraulic systems for equipment, machinery, and vehicles, where it provides leak-proof performance in oil-based fluids.
   • O-Rings and Gaskets: Found in fuel lines, oil handling equipment, and in systems where resistance to grease and lubricants is required.
2. Industrial Applications:
   • Oilfield Equipment: Seals, gaskets, and O-rings in drilling equipment, pipelines, and oil rigs where they are exposed to petroleum-based products.
   • Hydraulic Pumps and Systems: Buna-N is the standard for many hydraulic seals and components that operate in mineral oil-based fluids.
   • Pneumatic Seals: Often used in pneumatic systems where exposure to oils and greases is common.
3. Marine Applications:
   • Fuel Handling Systems: Buna-N seals are often found in marine applications where oil, fuel, and greases are in regular use, such as in engines, tanks, and pumps.
   • Gaskets for Water Systems: Can be used in certain freshwater and oil systems, though it's generally better suited to hydrocarbon exposure.
4. Consumer Products:
   • Appliance Seals: Used in seals and gaskets for home appliances that may involve exposure to oils or fuels, such as in motors or compressors.
   • Industrial Hoses: Buna-N is commonly used in hoses for fuel, oil, and grease transport due to its excellent resistance to these chemicals.
5. Agriculture and Heavy Equipment:
   • Hydraulic Systems: Used in tractors, excavators, and other heavy machinery that utilize hydraulic systems running on oil-based fluids.
   • Fuel Tanks and Handling Equipment: Seals and gaskets in fuel storage and dispensing equipment.

Summary of Buna-N (Nitrile) Advantages:

• Excellent oil and fuel resistance, making it ideal for automotive, aerospace, and industrial applications.
• Versatile and durable, used in hydraulic systems, pneumatic seals, and fuel handling equipment.
• Not suitable for exposure to ozone, strong acids, ketones, or aromatic hydrocarbons.

Buna-N 70 durometer is highly preferred for applications involving oils, fuels, and petroleum-based products, making it a go-to material for sealing in industries where hydrocarbons are prevalent.