6226-02 EPDM 70 U-Cup Seal 3/16" ID x 9/16" OD x 3/16" CS

This 70 durometer black EPDM U-Cup is peroxide cured for improved durability and compression set resistance. It is a strong choice for water, steam, and chemical applications where standard rubber compounds break down. You get a dependable seal that keeps your equipment running and reduces maintenance interruptions.D x 3/16" CS

If you need a seal that handles pressure, moisture, and aggressive chemicals without failing, this EPDM U-Cup is built to deliver. Designed to AN6226 standards, it gives you consistent sealing performance, reduced leakage risk, and longer service life in demanding systems.

Operating temperature: -40° to +300°F (–40° to +149°C)

This compound stays flexible in cold conditions while maintaining sealing strength at elevated temperatures.

Material & Performance Details

Manufactured from high-strength 70 durometer EPDM, this U-Cup is engineered for harsh environments involving water-based and chemical exposure.

Performance strengths include:

• Strong resistance to water and steam
• Excellent chemical resistance to polar fluids
• Reliable sealing up to 500 PSI
• Good compression set resistance for extended service life
• Excellent weathering and ozone resistance

Chemical compatibility:

Excellent resistance to:

• Water and steam
• Phosphate esters
• Ketones
• Alcohols
• Alkalis
• Anhydrous ammonia

Limited capability with:

• Mild acids depending on concentration

Not compatible with:

• Petroleum oils and fuels
• Concentrated sulfuric acid
• Concentrated nitric acid

Sizes & Measurements

• Cross Section (CS): 4.76 mm (0.187 in)
• Inside Diameter (ID): 4.76 mm (0.187 in)
• Outside Diameter (OD): 14.29 mm (0.562 in)
• Part Number: 6226-02
• Standard: AN6226 Series

Applications & Use Cases

This U-Cup is used in hydraulic and pneumatic systems where water, steam, or chemical resistance is critical. It performs well in valves, pumps, cylinders, and fluid systems exposed to harsh environments.

Common industries include:

• Water treatment and processing
• Chemical handling systems
• Industrial equipment
• Air and gas systems
• Applications using phosphate ester fluids

If your system runs in wet, chemical, or outdoor conditions, this seal helps prevent leaks and reduces downtime.

Key Specifications

• Material: EPDM (Peroxide Cured)
• Durometer: 70 Shore A
• Color: Black
• Standard: AN6226
• Certifications: UL approved per JOHX2 (water, steam, air, inert gases)
• Temperature Range: -40°F to +300°F (-40°C to +149°C)
• Pressure Rating: Up to 500 PSI

Why Buy from The O-Ring Store LLC

You are not just buying a seal. You are improving uptime and reducing risk.

• ISO9001:2015 certified for consistent quality
• USA-based inventory for fast delivery
• Same-day shipping on in-stock items
• Custom sealing solutions available
• Full lot traceability and documentation on request
• Experienced team ready to support your application
• Competitive pricing without sacrificing performance

We make getting O-Rings easy and make sure you get the right seal the first time.