.625in Silicone O-Ring Cord Stock 70A Durometer - 10 ft Red

In this review of the.625in silicone O-ring cord stock, the bottom line is straightforward: this red silicone cord is best for technicians and DIYers who need a reliable, temperature-tolerant sealing material for custom O-rings and gaskets. The reviewer found that the cord's 70A durometer offers a balance of flexibility and firmness, and its wide operating temperature range makes it suitable for many industrial and maintenance tasks where silicone compatibility matters.

Key Features

• Material: Made of silicone, the cord resists ozone, weather and many oils, making it useful for outdoor and automotive exposure.
• Temperature range: Rated for extreme temperatures, the cord performs across cold and hot cycles without hardening or cracking.
• Hardness: The 70A durometer provides a mid-range firmness that seals well under compression while remaining pliable for installation.
• Length and section: Supplied as a 10 ft piece with a round cross section, it is convenient for cutting multiple custom O-rings or short gasket runs.
• Origin: Made in the U S A, the cord meets expectations for manufacturing traceability and consistent quality.

Who It's For

The cord is aimed at mechanics, maintenance technicians, and hobbyists who need to produce custom O-rings or simple gasket profiles from a material that tolerates a wide range of chemicals and temperatures. It is particularly useful when resistance to ozone, detergents, salt water, and non-petroleum hydraulic fluids is required.

Those who require resistance to aromatic hydrocarbons, strong acids or bases, or continuous steam exposure above 250 degrees F should look elsewhere or verify compatibility, since silicone has known weaknesses with those substances and conditions.

Pros & Cons

Pros

• Good chemical resistance to ozone, weather, engine oils, and many hydraulic fluids.
• Wide usable temperature range that handles both cold and high-heat environments.
• 70A durometer balances sealing performance with ease of handling and cutting.
• Made in the U S A, which many users consider a mark of consistent quality.

Cons

• Silicone is vulnerable to aromatic and chlorinated hydrocarbons and prolonged steam above 250 degrees F, limiting use with some solvents and high-temperature steam systems.

Specifications

Our Verdict

This.625in silicone O-ring cord is a sensible choice for anyone who needs a durable, easy-to-cut seal material with broad temperature capability and good resistance to weathering and many oils. It represents good value for creating custom O-rings and gaskets, provided the user avoids solvents and steam conditions where silicone performs poorly.

Frequently Asked Questions

Can I cut this cord to make custom O-rings?
Yes, the 10 ft round cord is intended to be cut and spliced or glued into custom O-rings and gasket sections.

Is this cord suitable for continuous steam service?
No, silicone degrades under prolonged steam exposure above 250 degrees F, so it is not recommended for continuous high-temperature steam systems.

Will it resist automotive fluids?
Silicone resists many engine and transmission oils and non-petroleum brake fluids, but avoid exposure to aromatic hydrocarbons and certain chlorinated solvents.