.375 in Silicone O-Ring Cord Stock 70A Durometer Red

In this review of the.375 in silicone O-ring cord stock, the bottom line is simple: this red, 70A durometer cord is aimed at anyone rebuilding seals or creating custom O-rings who needs reliable temperature and chemical resistance. The reviewer found it particularly useful for custom sealing tasks where a round cross-section and consistent hardness matter. Its ability to tolerate extreme lows and highs, combined with U. S. A. manufacture, makes it a practical choice for industrial maintenance, hobby engineers, and automotive DIYers who value predictable material performance.

Key Features

• Material: Silicone construction provides strong resistance to ozone, weather, detergents, salt water and many oils, extending service life in exposed applications.
• Durometer: The 70A hardness offers a balance of flexibility and compression resistance suitable for general sealing tasks without being too soft.
• Temperature range: Rated for wide temperature extremes, it performs from very cold to very hot environments encountered in machinery or outdoor installations.
• Cross section and length: The round, 0.375 in thickness and 10 ft length let users cut multiple custom O-rings or long continuous seals for retrofit jobs.
• Made in the U. S. A.: Domestic manufacture helps ensure consistent quality and traceability for industrial users.

Who It's For

Professionals who repair pumps, valves, or engines and hobbyists who build custom assemblies will appreciate the consistent 70A hardness and broad chemical resistance for many non-petroleum fluids. The cord suits applications where silicone properties such as ozone and weather resistance are required.

It is less appropriate for situations exposed to prolonged steam above 250 degrees F or heavy mechanical abrasion, and it should be avoided where strong aromatic or chlorinated hydrocarbons are present. Users needing fuel resistance or extreme abrasion durability should consider alternate elastomers.

Pros & Cons

Pros

• Consistent 70A hardness that balances flexibility and sealing compression.
• Wide usable temperature range for varied environmental conditions.
• Good resistance to ozone, weather, detergents and many hydraulic and vegetable oils.

Cons

• Silicone is prone to mechanical wear and is vulnerable to certain chemicals like benzene and trichloroethylene.

Specifications

Our Verdict

This.375 in red silicone O-ring cord is a solid, cost-effective option for technicians and DIYers who need a predictable 70A seal material with broad temperature and chemical resistance. It offers good value when used in applications aligned with silicone strengths, though those needing fuel resistance or high abrasion durability should look to other compounds.

Frequently Asked Questions

Can this cord be used to cut custom O-rings?
Yes, the round 0.375 in cross section and 10 ft length make it suitable for cutting multiple custom O-rings or forming continuous seals.

Is the material resistant to engine oil and hydraulic fluids?
Silicone resists many engine and transmission oils and certain hydraulic fluids, but check compatibility for specific fluids as silicone is not universally fuel resistant.

What temperature extremes will it handle?
The cord is rated for a wide range, functioning from very low temperatures up to several hundred degrees F, suitable for most industrial and outdoor uses.