6226-01 EPDM 70 U-Cup Seal 1/8" ID x 1/2" OD x 3/16" CS

This 70 durometer black EPDM U-Cup is peroxide cured for enhanced durability and long-term performance. It is ideal for applications involving water, steam, and aggressive chemicals where standard materials fail. Built for customers who cannot afford leaks or repeat maintenance.

If you need a seal that holds pressure, resists harsh chemicals, and keeps your system running without leaks, this EPDM U-Cup is built for it. Designed to conform to AN6226 specifications, this seal delivers consistent performance in demanding environments where reliability matters most. You get reduced downtime, better sealing integrity, and confidence in every cycle.

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

This EPDM compound maintains flexibility at low temperatures while holding strength and sealing force at elevated temperatures.

Material & Performance Details

This U-Cup is manufactured from high-strength 70 durometer EPDM rubber, peroxide cured for improved compression set resistance and longevity.

Performance strengths include:

• Excellent resistance to water, steam, and weathering
• Strong resistance to polar fluids and chemicals
• Reliable sealing under pressure up to 500 PSI
• Good compression set resistance for longer service life

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 time)

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): 3.18 mm (0.125 in)
• Outside Diameter (OD): 12.70 mm (0.500 in)
• Part Number: 6226-01
• Standard: AN6226 Series

Applications & Use Cases

This EPDM U-Cup is commonly used in hydraulic and pneumatic systems where water-based or chemical-resistant sealing is required. You will find it in valves, pumps, cylinders, and systems exposed to steam or outdoor environments.

It is especially valuable in industries such as:

• Water treatment and fluid handling
• Chemical processing
• Food and beverage systems (non-oil contact)
• Industrial equipment using phosphate ester fluids
• Air and gas systems

If your application involves water, steam, or aggressive chemicals, this seal gives you reliability without constant replacement.

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

When you order from us, you are not just buying a seal. You are reducing risk in your operation.

• ISO9001:2015 certified processes ensure consistency and traceability
• USA-based inventory for fast, reliable shipping
• Same-day shipping on in-stock items
• Custom U-Cups available for unique applications
• Full lot traceability and documentation available
• Real technical support from people who understand sealing systems
• Competitive pricing without cutting corners

We focus on getting it right the first time so your equipment runs longer and your team spends less time fixing problems.