6226-13 EPDM 70 U-Cup Seal 9/16" ID x 1-1/16" OD x 1/4" CS

This 70 durometer black EPDM U-Cup is peroxide cured for improved durability and compression set resistance. It is a dependable choice for applications exposed to moisture, weather, and chemical environments where petroleum-based seals would fail. The result is fewer replacements, less downtime, and a more reliable system.x 1-1/16" OD x 1/4" CS

When you need a seal that performs under pressure and stands up to water, steam, and aggressive chemicals, this AN6226 EPDM U-Cup delivers. It is built to maintain sealing integrity, reduce leakage, and extend equipment life in systems where failure is not an option.

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

This EPDM compound remains flexible in cold environments while maintaining strength and sealing performance at elevated temperatures.

Material & Performance Details

Manufactured from high-strength 70 durometer EPDM rubber, this U-Cup is engineered for long service life in demanding environments.

Performance strengths include:

• Excellent resistance to water, steam, and weathering
• Strong resistance to polar chemicals
• Reliable sealing up to 500 PSI
• Good compression set resistance for extended life
• Peroxide cured for improved thermal stability

Chemical compatibility:

Excellent resistance to:

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

Limited capability with:

• Mild acids depending on concentration and exposure

Not compatible with:

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

Sizes & Measurements

• Cross Section (CS): 6.35 mm (0.250 in)
• Inside Diameter (ID): 14.29 mm (0.562 in)
• Outside Diameter (OD): 26.99 mm (1.062 in)
• Part Number: 6226-13
• Standard: AN6226 Series

Applications & Use Cases

This U-Cup is commonly used in hydraulic and pneumatic systems where water-based fluids or chemical exposure is present. It performs well in cylinders, valves, pumps, and systems requiring consistent sealing under pressure.

Typical industries include:

• Water treatment and distribution
• Chemical processing
• Industrial fluid systems
• Air and gas systems
• Equipment using phosphate ester fluids

If your system sees moisture, steam, or chemical exposure, this seal provides the reliability you need to keep operations running smoothly.

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 want it right the first time. That is how we run our business.

• ISO9001:2015 certified processes for consistent quality
• USA-based stock for fast and reliable shipping
• Same-day shipping on in-stock items
• Custom U-Cups available for unique applications
• Full lot traceability and documentation on request
• Experienced team that understands sealing systems
• Competitive pricing without cutting corners

We focus on helping you reduce downtime, avoid repeat failures, and keep your operation moving.