Mr O-Ring 454 Viton O-Ring 90A Durometer, 12-1/2 in ID - Durable Seal

In this review the Mr O-Ring 454 Viton O-Ring is judged as a specialist sealing component for demanding environments; it is best for technicians and maintenance teams who need a heat- and chemical-resistant o-ring that holds tolerances. The bottom line: the 90A durometer Viton compound delivers reliable resistance to fuels, oils and high temperatures while matching AS568 size standards, so it is a practical choice when compatibility with petroleum products and a wide temperature range matters.

Key Features

• Material: 454 Viton (FKM) provides excellent resistance to fuels, mineral oils and many organic solvents, reducing seal degradation in contact with harsh fluids.
• Hardness: 90A durometer gives a firm cross-section that resists extrusion while still forming a reliable static seal under compression.
• Temperature range: Rated from -26C to 232C (-15F to 450F), allowing use in both low-temperature and very high-temperature service without rapid loss of properties.
• Dimensional accuracy: Nominal and actual dimensions are closely matched (12-1/2 in ID nominal, actual 12.475 in ID), making this O-ring suitable where AS568 sizing and fit are important.
• Chemical versatility: Performs well with diesel, biodiesel blends, methanol or ethanol blends, silicone oils, and even strong acids in many applications.
• Shelf-life: Effectively unlimited shelf-life when stored properly, so spares can be kept on hand without concern for expiry.

Who It's For

The Mr O-Ring 454 Viton 90A is aimed at professionals in hydraulics, plumbing maintenance, and industrial service who need a resilient seal that tolerates fuels, high temperatures and aggressive fluids. It is ideal for repair shops, industrial maintenance departments and OEMs specifying AS568-compatible Viton seals.

Those who should look elsewhere include users needing extremely soft or elastic seals for low-pressure dynamic rotary shafts (a softer compound may be better) or applications requiring temperatures below -26C for extended periods, where a different elastomer with better low-temperature flexibility would be preferable.

Pros & Cons

Pros

• Excellent chemical and heat resistance from the Viton FKM compound for petroleum and solvent exposure.
• Accurate sizing with nominal and actual dimensions that align to AS568 expectations, easing replacement.
• Firm 90A hardness resists extrusion and maintains a reliable static seal in many systems.
• Long storage life means spares can be stocked without frequent turnover.

Cons

• 90A hardness is relatively firm, so it may not be the best choice for low-pressure dynamic shaft seals where a softer material is preferred.
• Not specified for specialized food-grade or medical use in the provided details, so verification is required for those markets.

Specifications

Material	454 Viton (FKM)
Durometer	90A
Nominal dimensions (ID x OD x CS)	12-1/2 in ID, 13 in OD, 1/4 in CS
Actual dimensions (ID x OD x CS)	12.475 in ID, 13.025 in OD, 0.275 in CS
Metric dimensions	316.87 mm ID, 330.85 mm OD, 6.99 mm CS
Temperature range	-26C (-15F) to 232C (450F)

Our Verdict

The Mr O-Ring 454 Viton 90A is a solid choice for industrial and maintenance use where chemical and heat resistance are required; professionals replacing AS568 sizes will appreciate the accurate dimensions and long shelf-life. It represents good value when a durable, petroleum-resistant seal is needed, though applications demanding softer dynamic sealing should consider alternative durometers.

Frequently Asked Questions

Is this O-ring compatible with diesel and biodiesel blends?
Yes, the Viton FKM compound is specified to perform well with diesel and biodiesel blends as listed in the product details.

Does the 90A hardness work for static and dynamic seals?
90A is well suited to static seals and many low- to moderate-pressure applications; for high-speed dynamic shafts a softer compound might be preferable.

Will the size match industry standards?
Yes, this O-ring is intended to meet AS568 size standards and actual dimensions are provided to confirm fit.