464 Viton O-Ring 90A Durometer, 17-1/2in ID - Durable Chemical Seal

In this review the 464 Viton O-Ring is assessed for mechanics, hobbyists, and industrial users who need a small number of high-temperature, chemical-resistant seals. The bottom line is that this single-pack O-ring delivers reliable sealing where heat, fuel, and many solvents are present; its Viton construction and 90A durometer make it a durable choice for static and semi-dynamic applications. It is best for repairs or replacements where the exact Aerospace Standard size and resistance profile matter more than bulk quantity.

Key Features

• Viton material: Provides resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals, so the ring lasts in harsh environments.
• 90A hardness: The firmer durometer increases resistance to penetration and extrusion in higher-pressure seals compared with softer compounds.
• Round cross-section: Designed to form a reliable seal between cylindrical overlapping surfaces such as housings and caps.
• Wide temperature range: Rated from -15 degrees F to 400 degrees F, suitable for many high-heat applications including heaters and some engine components.
• AS568A sizing: Conforms to the Aerospace Size Standard for O-rings, simplifying replacements when that standard is required.

Who It's For

This O-ring suits technicians, home mechanics, and equipment owners needing a single, exact-size replacement in applications like small pumps, spa heaters, or classic car repairs where chemical and heat resistance is important. It also appeals to workshop users who value the known performance of a fluorocarbon elastomer rather than generic rubber.

Those who need large quantities, softer seals for very low-pressure or dynamic rotary shafts, or resistance to strong alkalis and amines should look elsewhere; Viton performs poorly with some low molecular weight organic acids and alkali environments.

Pros & Cons

Pros

• High chemical and heat resistance from the Viton compound, making it durable in fuel and solvent exposure.
• Firm 90A durometer reduces deformation and helps maintain a tight seal under compression.
• AS568A size standard ensures predictable fit for applications using aerospace or standardized O-ring sizes.
• Customers report good fit and value for money in varied repairs and projects.

Cons

• Single-pack quantity limits users who need multiple seals; bulk buyers will find this inconvenient.
• Not compatible with certain chemicals such as some low molecular organic acids and strong alkalis.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer	90A
Cross-section	Round
Inner diameter	17-1/2 in
Outer diameter	18 in
Width	1/4 in
Temperature range	-15 degrees F to 400 degrees F

Our Verdict

The 464 Viton O-Ring is a sensible single-item purchase for repairs requiring a standardized size and strong resistance to heat, fuels, and many solvents. It represents good value for users who need durability and predictable performance, though those needing many rings or compatibility with strong alkalis should consider alternative materials or bulk options.

Frequently Asked Questions

Is this O-ring suitable for fuel systems?
The Viton material is compatible with many fuels and aromatic hydrocarbons, making it suitable for many fuel system seals, though confirm compatibility with your specific fluid.

Will it handle spa heater temperatures?
Yes; the ring is rated to 400 degrees F and has been used successfully in spa heater repairs within that limit.

Is the size standardized for replacements?
Yes; the ring meets the AS568A aerospace size standard, which helps ensure a predictable fit for applications using that sizing.