O-ring thread

A versatile solution for O-rings of any size

Custom O-ring manufacturing with O-ring thread

O-ring thread or cord is an extruded profile of circular section manufactured under strict tolerance controls, ensuring a high quality product. This material is produced in the most requested O-ring sections (d2), allowing its use in multiple industrial applications.

One of its main advantages is the possibility of manufacturing O-rings of any size without the need for expensive molds. It is sufficient to cut the thread to the desired length and join its ends by different methods, such as, for example, the vulcanization, obtaining a gasket with the necessary dimensions. In the case of not knowing the dimensions, Epidor has complete kits that include O-ring thread of various sizes (usually NBR) and a cyanoacrylate adhesive to join the ends.

The O-Ring is an excellent solution for the static sealing of covers and allows the installation of O-Rings to the required size in each equipment, even up to several meters in diameter.

Materials available for O-ring thread

Material	Temperature resistance (°C)	Main properties
Material: NBR (acrylonitrile butadiene rubber)	Temperature resistance (°C): 60 - 90	Main properties: Resistance to lubricants (greases and oils, in general)
Material: FPM - Viton™ (fluoroelastomer rubber)	Temperature resistance (°C): 60 - 90	Main properties: High chemical and thermal resistance
Material: VMQ (methylvinyl silicone rubber)	Temperature resistance (°C): 60 - 85	Main properties: Retains its elasticity at very low temperatures (< -60 ºC).
Material: EPDM (Ethylene/Propylene/Diene Terpolymer)	Temperature resistance (°C): 60 - 75	Main properties: Good resistance to weathering, hot water, steam, ketones, acids, etc...
Material: CR (chloroprene rubber - Neoprene)	Temperature resistance (°C): 60 - 75	Main properties: Good resistance to weathering, lubricants, ammonia and refrigerants in general.
Material: H-NBR (hydrogenated acrylonitrile butadiene rubber)	Temperature resistance (°C): 60 - 90	Main properties: Improved chemical resistance and abrasion resistance of NBR.
Material: H-NBR (hydrogenated acrylonitrile butadiene rubber)	Temperature resistance (°C): 60 - 90	Main properties: Improved chemical resistance and abrasion resistance of NBR.
Material: FEPM - Aflas® (tetrafluoroethylene-propylene copolymer)	Temperature resistance (°C): 60 - 90	Main properties: High resistance to aggressive chemicals and steam
Material: Sponge materials (CR, NBR, EPDM, VMQ)	Temperature resistance (°C): -	Main properties: Flexibility and sealing with minimal deformation
Material: virgin PTFE (polytetrafluoroethylene)	Temperature resistance (°C): -	Main properties: Almost universal chemical resistance

Note: Others materials available upon request.

O-ring thread applications

If you have any doubts, our team of experts will help you choose the most suitable O-ring.

The O-ring is an ideal solution for static sealing in equipment and covers that require custom gaskets. It is used in applications that require large diameter joints, reaching up to several meters.

Sectors where the toric thread is used:

Some of the elastomeric materials available have certifications for sectors such as:

Food and Beverages → FDA and CE 1935/2004 certifications.
Pharmacy, Cosmetics and Health → Compliance with USP Class VI standards.
Chemical, Petrochemical and Gas → Resistance to aggressive chemicals.
Aeronautics and Electronics → Applications with extreme temperatures and electrical compatibility.

Advantages of O-ring seals over standard seals

The O-Ring offers multiple benefits compared to conventional seals:

Key benefits:

Versatility in dimensionsThe possibility of manufacturing gaskets of virtually any size without the need for molds.
Tailor-made adaptationThe material is cut to the desired length and joined by means of adhesive or vulcanization.
Wide range of materials: options with resistance to extreme temperatures, aggressive chemicals and specific regulations.
Flexible supplySections (d2) available from stock between 1 mm and 30 mm, with other options on request.

FAQ's about toric thread

What is the toric thread used for?

O-ring thread is used to manufacture custom seals for static applications. It is ideal for equipment with large diameters or custom designs where standard seals are not feasible.

What is the difference between a standard O-ring and one made from O-ring thread?

Standard O-rings are manufactured by molding and have fixed dimensions. On the other hand, the O-ring thread allows the manufacture of seals of any size by cutting the required length of the extruded profile and joining it with adhesive or hot vulcanization.

Can toric thread be used in dynamic applications?

Not recommended. The O-ring is designed for static applications. In dynamic applications, the bonding point may weaken due to constant movement. For applications with movement, other sealing solutions are available.

Is it possible to manufacture toric thread in specific colors?

Yes, some materials such as NBR (acrylonitrile butadiene rubber), VMQ (silicone) and the EPDM can be manufactured in different colors upon request, especially in applications that require visual identification or must comply with specific regulations.