O-Ring Cords
O-Ring Cord is a continuous cord of elastomer material used to create O-rings, which is sold by the meter.
Production:
An O-ring splicing kit is required for the creation of O-rings from cord.
Calculate the length of cord required by following the formula:
((OD+ID) / 2) x Pi = Length where (Pi = 3.14159).
Techno Ad – Explore The Possibilities
Techno Ad offers O-ring cord in all standard AS568 and ISO 3601 sizes, and also in many additional non-standard sizes. Our cords are available in square, backup, X and other cross-section types. They are available in various materials (NBR, EPDM, FKM, Silicone, etc.), dimensions, hardnesses, and colors.
Techno Ad has support for continuous vulcanization, through compressions molding, for large diameter O-rings (over 1400mm).
Small minimum order quantities (MOQ) can be processed for in-stock O-ring cord.
Frequently Asked Questions About O-Ring Cords
What is an O-Ring Cord and what is it used for?
An O-Ring Cord is a continuous length of elastomeric material with a circular cross-section, designed to be cut and joined to create custom-sized O-Rings. At Techno Ad, we supply high-quality O-Ring Cords for applications where standard O-Ring sizes are not available or where rapid, flexible sealing solutions are needed.
When should I use an O-Ring Cord instead of a standard O-Ring?
What materials are available for O-Ring Cords?
At Techno Ad, we offer O-Ring Cords in a wide range of materials, including:
NBR (Nitrile) – for general industrial use.
EPDM – for water and steam resistance.
FKM (Viton®) – for high chemical and temperature resistance.
Silicone – for extreme temperature flexibility.
FFKM – for aggressive chemical environments (upon request).
Each material is selected based on the application’s operating conditions and performance requirements.
How are O-Ring Cords joined to form a complete O-Ring?
The ends of the O-Ring Cord are typically bonded using adhesive gluing or vulcanization methods. At Techno Ad, we provide both raw cords for on-site assembly and fully joined custom O-Rings, manufactured under controlled conditions to ensure high-strength, durable bonds.
Are there different cross-section profiles available for O-Ring Cords?
Yes. While the standard cross-section is circular, at Techno Ad we can also offer specialty profiles — such as square, rectangular, or custom-engineered sections — for applications requiring unique sealing characteristics.
Can O-Ring Cords handle high-pressure applications?
While O-Ring Cords are highly versatile, they are generally recommended for static or low-pressure dynamic applications. For high-pressure systems, special attention must be paid to joint strength and the use of adhesives. Techno Ad’s experts guide our customers through proper selection, joint techniques, and design considerations to maximize sealing integrity.
What sizes of O-Ring Cords are available?
Techno Ad offers O-Ring Cords in a wide range of standard diameters — from very thin cords (e.g., 1.0 mm) to thick heavy-duty cords (e.g., 25.0 mm or larger). Custom diameters are also available upon request to meet unique project specifications.
Can Techno Ad supply fully bonded O-Rings made from O-Ring Cord?
Absolutely. We offer complete, precision-bonded O-Rings manufactured from O-Ring Cord, ensuring consistent joint quality, leak-tight performance, and faster delivery times compared to custom molding — a perfect solution for large diameter or special-size sealing requirements.
In which industries are O-Ring Cords most commonly used?
O-Ring Cords are used across multiple industries including general manufacturing, food processing, chemical processing, aerospace, and energy. Their flexibility and adaptability make them an essential solution for maintenance teams, OEMs, and equipment manufacturers.
Is there a higher-performance alternative to bonded O-Ring Cords for critical applications?
Yes. For critical or high-performance applications where the integrity of the bond is paramount, Continuous Vulcanization (CV) is an advanced alternative to conventional adhesive or manual bonding. This method involves extruding and vulcanizing the O-Ring cord in a single, seamless process — eliminating the need for a glued joint entirely. The result is a fully homogeneous O-Ring with superior mechanical strength, chemical resistance, and long-term reliability.
At Techno Ad, we recognize that CV is significantly more expensive than standard bonding techniques, but for mission-critical environments — such as high-pressure systems, dynamic sealing, or harsh chemical exposure — it offers unmatched performance and durability. Our technical team can advise whether CV is the right solution for your application based on cost-benefit analysis and performance criteria.