Mr O-Ring 452 EPDM O-Ring 70A 11-1/2in ID Pack of 5

In this review the Mr O-Ring 452 EPDM O-Ring is evaluated for workshop and field sealing tasks where weather resistance and a broad temperature range matter. The bottom line: this pack of five 70A durometer EPDM o-rings is best for technicians and hobbyists who need reliable, weather-resistant seals sized to AS568 conventions, and the single biggest reason to buy is the combination of accurate nominal and actual dimensions plus a material that resists ozone, sunlight and many common fluids.

Key Features

• 70A Durometer: Provides a firm yet flexible seal suitable for static and low-dynamic applications where a balance of resilience and compression set is needed.
• Accurate dimensions: Nominal 11-1/2in ID, 12in OD and 1/4in CS with actual measured sizes for reliable fit in housings specified to those tolerances.
• EPDM material: Excellent resistance to ozone, sunlight and weathering, making these o-rings appropriate for outdoor and exposed installations.
• Chemical compatibility: Works with alcohols, automotive brake fluid, dilute acids and alkalis, silicone oils and greases, and steam up to high short-term temperatures.
• Wide temperature range: Rated from -55C (-67F) to 125C (257F) for broad use across cold and hot service conditions.

Who It's For

These EPDM o-rings are aimed at maintenance professionals, HVAC and plumbing technicians, and DIY users who need dependable sealing for water systems, brake fluid interfaces, steam-exposed components, or outdoor equipment exposed to UV and ozone. The pack of five and the clear stated actual dimensions make them convenient when replacing multiple seals in a system.

Users requiring resistance to strong hydrocarbons, certain oils not listed, or specialized food-grade certifications should look elsewhere, since EPDM is not universally compatible with all nonpolar solvents and specific regulatory grades are not specified in the product information.

Pros & Cons

Pros

• Good weather and ozone resistance from EPDM, making it durable for outdoor use.
• Concrete nominal and actual dimensions reduce guesswork when fitting into standard AS568 sized housings.
• Wide usable temperature range and compatibility with many common fluids encountered in industrial and automotive contexts.

Cons

• Not specified for all aggressive hydrocarbon fluids, so may not suit every chemical service.

Specifications

Material	452 EPDM
Durometer	70A
Nominal dimensions	11-1/2in ID x 12in OD x 1/4in CS
Actual dimensions	11.475in ID x 12.025in OD x 0.275in CS
Metric dimensions	291.47 mm ID x 305.45 mm OD x 6.99 mm CS
Temperature range	-55C (-67F) to 125C (257F)
Pack size	Pack of 5

Our Verdict

The Mr O-Ring 452 EPDM 70A o-ring pack is a practical choice for anyone needing reliable, weather-resistant seals in standard AS568 sizing; it delivers accurate dimensions, broad fluid compatibility for many common applications and strong ozone/UV resistance, making it good value for maintenance and outdoor sealing tasks.

Frequently Asked Questions

Are these o-rings suitable for outdoor use?
Yes. The EPDM material offers excellent resistance to ozone, sunlight and weathering, making them appropriate for outdoor installations.

Will these work with steam?
They are compatible with steam up to about 204.4C (400F) for certain exposures as noted, though the continuous temperature rating is -55C to 125C.

Do the sizes follow AS568 standards?
Yes. The product is designed to meet AS568 size definitions and includes both nominal and actual measured dimensions for fit confirmation.