465 Viton O-Ring 90A Durometer 18 in ID - Durable High-Temp Seal

In this review the Mr O-Ring 465 Viton O-Ring is presented as a focused choice for technicians and hobbyists who need a single, high-temperature sealing solution. The bottom line: this 90A durometer FKM o-ring is best for applications requiring broad chemical resistance and reliable dimensional standards; its main selling point is performance across fuels, oils and high heat up to 232C (450F). The review examines fit, material performance and the practical details that matter when replacing an AS568-style seal.

Key Features

• Material: Made from Viton (FKM), it resists petroleum, mineral oils and many organic solvents for longer service life in harsh fluids.
• Durometer: The 90A hardness provides a stiffer seal that is useful where compression set must be minimized under high temperatures.
• Temperature range: Rated from -26C (-15F) to 232C (450F), it covers applications from cold storage lines to very high temp air and fluid systems.
• Dimensional accuracy: Nominal and actual dimensions are provided so fitters can match ID and cross section precisely for AS568 compatible grooves.
• Chemical versatility: Performs well with fuels including methanol or ethanol blends, diesel and biodiesel, plus oils, ozone and weather exposure.
• Shelf life: Effectively unlimited shelf-life when stored properly, so spares can be kept long-term without loss of performance.

Who It's For

This o-ring is aimed at mechanics, hydraulic technicians and maintenance personnel who need a single replacement that meets common AS568 size standards and tolerates fuels, oils and high temperatures. Its 90A hardness and Viton chemistry make it suitable for pumps, fuel systems and high-temp static sealing where chemical resistance is critical.

Those who should look elsewhere include users who need a much softer seal for low-pressure dynamic shafts or where extreme low-temperature flexibility below -26C is required. Also consider alternatives if EPDM or silicone-specific compatibility is required for certain acids or steam applications.

Pros & Cons

Pros

• Excellent resistance to petroleum products and many organic solvents, reducing seal failure in fuel-exposed systems.
• High maximum temperature rating allows use in hot engine or process environments without rapid degradation.
• Clear nominal and actual dimensions ease correct selection for AS568 style grooves and replacement tasks.

Cons

• At 90A durometer the o-ring is relatively firm, which can be less ideal for low-pressure dynamic sealing or where a soft squeeze is preferred.

Specifications

Brand	Mr O-Ring
Material	Viton (FKM)
Durometer	90A
Nominal Dimensions	18 in ID, 18-1/2 in OD, 1/4 in CS
Actual Dimensions	17.955 in ID, 18.505 in OD, 0.275 in CS
Metric Dimensions	456.06 mm ID, 470.04 mm OD, 6.99 mm CS
Temperature Range	-26C (-15F) to 232C (450F)

Our Verdict

The 465 Viton 90A o-ring is a practical, value-oriented choice for anyone needing a heat- and chemical-resistant AS568-sized seal. Its proven Viton chemistry and clearly stated dimensions make it reliable for fuel systems, oil applications and high-temperature static seals; buy it when chemical compatibility and temperature tolerance are priority concerns.

Frequently Asked Questions

Is this o-ring compatible with gasoline and diesel?
Yes; the Viton formulation is designed to perform well with gasoline, diesel and common fuel blends including alcohol blends.

Will the 90A hardness work for dynamic shaft seals?
The 90A durometer is relatively firm and is best for static or low-movement seals; softer materials are preferable for high-speed dynamic shafts.

Does this part follow AS568 sizing?
Yes; the o-ring is offered to meet size standards defined by AS568 and provides both nominal and actual dimensions for accurate replacement.