Mr O-Ring 450 Viton O-Ring 90A Durometer 10-1/2in ID - Durable Seal

In this review the Mr O-Ring 450 Viton O-Ring is evaluated for workshop and industrial sealing tasks where chemical and temperature resistance matter most. The bottom line: this single-pack Viton o-ring is aimed at technicians and maintenance pros who need a hard 90A durometer seal that withstands fuels, oils and high heat up to 232C (450F). The review focuses on real-world durability, dimensional accuracy, and material suitability so a buyer can decide if this specific size and hardness fits their application.

Key Features

• Material: Made from high-performance Viton (FKM), it resists fuels, mineral oils and many organic solvents for extended service life.
• Hardness: The 90A durometer provides a firm cross-section that maintains seal integrity under pressure and compression set conditions.
• Temperature range: Rated from -26C (-15F) to 232C (450F), it performs across a wide thermal span for hot-engine and high-temp process uses.
• Dimensions: Nominal 10-1/2in ID, 11in OD, 1/4in CS with actual measurements close to spec for reliable replacement of AS568 sizes.
• Chemical compatibility: Suitable for petroleum products, diesel blends, methanol/ethanol blends, silicone oils and many strong acids in intermittent exposure.
• Shelf-life: Effectively unlimited in storage when kept clean and dry, reducing the need for frequent inventory turnover.

Who It's For

The Mr O-Ring 450 Viton O-Ring is best for industrial maintenance crews, HVAC and hydraulic technicians, and anyone servicing engines or fuel systems that demand high temperature and chemical resistance. It is particularly appropriate where a firmer 90A durometer is preferred to limit extrusion and maintain a long-term seal under pressure.

Those who should look elsewhere include hobbyists needing very soft or food-grade seals, or users who require elastomers with extreme low-temperature flexibility below -26C, since this compound is optimized for higher temperature and chemical resilience rather than ultra-low-temperature softness.

Pros & Cons

Pros

• Excellent resistance to fuels, oils and many solvents, making it reliable in petrochemical environments.
• High temperature capability to 232C (450F) means it works in hot engine or process applications.
• 90A hardness reduces compression set and improves longevity in pressurized joints.
• Actual dimensions closely match nominal sizes for straightforward AS568-compatible replacement.

Cons

• At 90A hardness it is relatively firm, so it may not seal as well in applications needing a softer, more conforming material.
• Single-pack sizing means frequent buyers may prefer larger multipacks for inventory efficiency.

Specifications

Material	Viton (FKM)
Durometer	90A
Nominal dimensions	10-1/2in ID, 11in OD, 1/4in CS
Actual dimensions	10.475in ID, 11.025in OD, 0.275in CS
Metric dimensions	266.07 mm ID, 280.05 mm OD, 6.99 mm CS
Temperature range	-26C (-15F) to 232C (450F)

Our Verdict

The Mr O-Ring 450 Viton O-Ring is a solid choice for professionals needing a durable, chemical- and heat-resistant seal in a common AS568-equivalent size. Its 90A hardness and close-to-nominal actual dimensions make it reliable for fuel, oil and high-temp sealing tasks, and it represents good value when a firm, long-lasting Viton seal is required.

Frequently Asked Questions

Is this o-ring compatible with fuel and diesel?
Yes, the Viton compound is designed to perform well with petroleum products, diesel and blends including biodiesel in typical sealing applications.

Will it handle high temperatures?
Yes, it is rated to 232C (450F) for intermittent or continuous high-temperature service within that range.

Does the actual size match the nominal
The product lists actual dimensions (10.475in ID, 11.025in OD, 0.275in CS) that closely match the nominal 10-1/2in ID, 11in OD, 1/4in CS for straightforward replacement.