Mr O-Ring 451 Viton O-Ring 90A 11in ID 11-1/2in OD - High Temp Seal

In this review the Mr O-Ring 451 Viton O-Ring is evaluated for users who need a dependable high-temperature seal for fuels, oils, and harsh environments; the single biggest reason to buy is its material resilience, as this 90A durometer Fluorocarbon rubber maintains sealing performance across a wide temperature range and resists petroleum, biodiesel blends, and many solvents. The pack of 1 sized to a nominal 11in ID and 11-1/2in OD is aimed at maintenance technicians and equipment owners who need a direct replacement built to AS568 sizing standards.

Key Features

• Material: Viton (Fluorocarbon rubber) delivers strong resistance to high temperature, ozone, weather and many organic solvents, so the seal lasts in demanding environments.
• Durometer: The 90A hardness provides a firm cross-section that resists extrusion while maintaining an effective seal under pressure.
• Temperature range: Rated from -26C (-15F) to 232C (450F), it works for both low-temperature and very high-temperature applications without rapid degradation.
• Compatibility: Performs well with petroleum, ethanol/methanol blends, diesel and biodiesel, mineral and silicone oils and greases, making it suitable for fuel and lubrication systems.
• Dimensions: Nominal 11in ID, 11-1/2in OD, 1/4in CS with actual dimensions close to nominal for reliable fitment in AS568 specified grooves.
• Shelf life: Effectively unlimited shelf-life when stored properly, so spares can be stocked without concern for expiration.

Who It's For

This o-ring is best for industrial maintenance personnel, plumbing and hydraulic technicians, and DIYers who need a robust replacement o-ring that resists fuels, oils and elevated temperatures. Its 90A durometer and Viton compound make it particularly suitable where chemical resistance and heat tolerance are required, such as fuel systems, high-temp pumps or static seals exposed to solvents.

Those who should look elsewhere include users who need a softer, more flexible sealing material for low-pressure dynamic seals or applications requiring extreme elasticity; also if a different size or a multi-pack is needed, other listings provide alternative CS or pack quantities.

Pros & Cons

Pros

• Excellent chemical and high-temperature resistance thanks to the Viton compound, extending service life in harsh fluids.
• Firm 90A durometer reduces extrusion and helps retain seal shape under load.
• AS568-compatible nominal sizing and close actual dimensions make replacements straightforward.
• Unlimited shelf-life means reliable spare stock for maintenance kits.

Cons

• 90A hardness can be too stiff for some low-pressure dynamic applications requiring softer materials.
• Sold as a single o-ring which may not suit users seeking multi-pack convenience.

Specifications

Material	Viton (Fluorocarbon rubber, FKM)
Durometer	90A
Nominal dimensions	11in ID x 11-1/2in OD x 1/4in CS
Actual dimensions	10.975in ID x 11.525in OD x 0.275in CS
Metric dimensions	278.77 mm ID x 292.75 mm OD x 6.99 mm CS
Temperature range	-26C (-15F) to 232C (450F)
Shelf life	Unlimited when stored correctly

Our Verdict

The Mr O-Ring 451 Viton 90A o-ring is a practical choice for professionals and homeowners needing a durable, chemically resistant seal that endures high temperatures; it represents good value when a single, AS568-sized replacement is required, especially for fuel and oil systems where Viton performance is important.

Frequently Asked Questions

Is this o-ring compatible with gasoline and diesel?
Yes, the Viton compound is rated for petroleum products, diesel and blends including biodiesel, making it suitable for those fuels.

Will the 90A hardness affect sealing in dynamic applications?
The 90A durometer is relatively firm and may not be ideal for low-pressure dynamic seals that need more elasticity; it is best for static or higher-pressure applications.

Does the size conform to standard AS568 nomenclature?
Yes, the o-ring is offered to AS568 size standards with nominal and actual dimensions provided for accurate replacement.