Mr O-Ring 906 Viton O-Ring 90A Durometer Pack of 500 - High Temp Seal

In this review the Mr O-Ring 906 Viton O-Ring 90A is examined for users who need a reliable, high-temperature seal in bulk. The bottom line: this pack of 500 o-rings is aimed at shops, maintenance teams, and engineers who require consistent dimensions and excellent resistance to fuels, oils and high heat; the biggest reason to buy is its broad chemical compatibility and a usable temperature range up to 232C, which keeps assemblies sealed where many other elastomers would fail.

Key Features

• Material: FKM Viton construction provides durable resistance to fuels, mineral oils and many solvents, reducing seal failures in aggressive environments.
• Hardness: 90A durometer offers a firm seal that holds shape under pressure while still compressing enough to create a reliable fluid-tight barrier.
• Size accuracy: Actual dimensions of 0.468 in ID, 0.624 in OD and 0.078 in cross-section match AS568 sizing for predictable fit in standard housings.
• Temperature range: Rated from -26C (-15F) to 232C (450F), allowing use across very low to very high temperature applications without rapid degradation.
• Bulk quantity: Pack of 500 supplies multiple repair jobs or production runs, lowering per-piece cost and saving time on frequent replacements.
• Shelf-life: Essentially unlimited shelf-life makes storage simple for spares or inventory without concern for early aging.

Who It's For

This o-ring pack is best for maintenance shops, industrial technicians, HVAC and hydraulic professionals who service engines, pumps and fluid systems exposed to petroleum products, diesel, biodiesel blends, silicone oils or harsh chemicals. The bulk quantity and AS568 sizing make it a convenient choice for anyone who needs many identical, reliable seals on hand.

Those looking for extremely soft seals for low-friction dynamic shafts or for specialty low-temperature-only elastomers should look elsewhere, as the 90A durometer is on the firmer side and optimized for durability rather than ultra-soft sealing feel.

Pros & Cons

Pros

• Excellent chemical and heat resistance thanks to Viton (FKM) material, extending lifetime in harsh fluids.
• Consistent AS568-equivalent sizing ensures interchangeability with standard o-ring grooves and hardware.
• Large pack size of 500 is economical and practical for frequent repairs or assembly work.
• Wide temperature tolerance supports both high-temp and many vacuum applications.

Cons

• 90A hardness may be too firm for some low-pressure dynamic seals or applications that need a softer durometer for better conformity.

Specifications

Material	Viton (FKM)
Durometer	90A
Actual ID	0.468 in (11.89 mm)
Actual OD	0.624 in (15.85 mm)
Cross-section	0.078 in (1.98 mm)
Temperature range	-26C (-15F) to 232C (450F)
Pack size	500 pieces

Our Verdict

The Mr O-Ring 906 Viton 90A pack is a strong value for professionals who need long-lasting seals resistant to fuels, oils and high temperatures. The accurate dimensions and AS568 compatibility make it easy to replace standard o-rings, and the bulk quantity reduces downtime and cost per unit, so shops and service teams will find this a practical, dependable choice.

Frequently Asked Questions

Are these o-rings compatible with gasoline and diesel?
Yes; Viton is designed to perform well with petroleum products, diesel and biodiesel blends, making these rings suitable for fuel system seals.

What size are these o-rings in metric?
The pack lists dimensions as 11.89 mm ID, 15.85 mm OD and 1.98 mm cross-section.

Can these be used at high temperatures?
Yes; the rated operating range extends to 232C (450F), appropriate for many high-temperature sealing applications.