O-rings
Epidor is synonymous with watertightness

Leaders in O-rings with more than 70 years of experience

At Epidor, we have been supplying high quality O-rings in the Iberian Peninsula for more than six decades. With more than 12,000 references in stock, we offer solutions in a wide variety of materials, sizes and configurations, in addition to the ability to custom manufacturing for specific applications.

Vulcanized O-rings: manufacture without size limit

When a standard gasket does not fit the needs of the application, Epidor offers vulcanized O-rings, a flexible and efficient solution to manufacture large diameter gaskets without the need for molds. Thanks to our advanced vulcanization process, we bond o-ring thread in materials such as NBR, EPDM, FPM (Viton®) and VMQ FDA (silicone), guaranteeing high chemical, thermal and mechanical resistance.

Available sizesfrom 3.00 mm to 12.00 mm cross-sections, with a minimum inside diameter of 200 mm and no limit to the maximum diameter.
Advantages over adhesively bonded jointsresistance to extreme temperatures, chemicals and higher pressures.

If you need a large gasket with high durability, consult our technical team to find the best solution.

More information about vulcanized gaskets.

What is an O-ring? Definition and characteristics

An O-ring (O-ring) is a ring with a circular or toroidal section, designed to seal fluids and gases in mechanical and hydraulic systems.

Key dimensions:

Inside diameter (d1)
Torus cross section (d2) (joint thickness)

Applications:

Static tightnesssealing without relative movement between the contact surfaces.
Dynamic sealingAlthough it is not recommended, in certain cases, it can be used in piston rods and shafts.

Find out more about O-rings, their applications and manufacturing process in this detailed article of our blog.

O-ring materials available from stock and to order

Selecting the right material is critical to ensure optimum performance. At Epidor, we offer O-rings in a wide variety of materials, each with specific properties for different applications.

In addition, our materials are of European origin and of the highest quality, guaranteeing a correct sealing and a long service life of the equipment.

Table of materials and properties

Material	Temperature resistance (°C)	Main properties	Recommended applications
Material: NBR (Nitrile)	Temperature resistance (°C): -30 a +110	Main properties: Resistance to oils and fuels	Recommended applications: Hydraulics, pneumatics, automotive
Material: FPM /FKM	Temperature resistance (°C): -20 a +210	Main properties: High chemical and thermal resistance	Recommended applications: Chemical, aerospace and pharmaceutical industries
Material: EPDM	Temperature resistance (°C): -39 a +150	Main properties: Resistance to steam and ozone	Recommended applications: Food, pharmaceuticals, energy
Material: Silicone (VMQ)	Temperature resistance (°C): -60 a +250	Main properties: Extreme flexibility and atoxicity	Recommended applications: Food, health, cryogenic applications
Material: FFKM	Temperature resistance (°C): -15 a +276	Main properties: Almost universal chemical resistance	Recommended applications: Chemicals, oil and gas, pharmaceuticals and food

Note: Others materials available upon request.

Key properties of an O-ring

To ensure an effective and durable seal, O-rings must meet various technical requirements:

Performance factors:

Chemical resistanceCompatible with oils, fuels, chemicals and gases, among other substances.
Thermal resistanceSafe and reliable operation in extreme temperatures.
Wear resistanceIdeal for high pressure applications.
Hardnessaccording to application and working pressure.
Low remaining deformationcapacity to recover its original shape after deformation.

How to choose the right O-ring

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

Selecting the correct O-ring is essential to avoid seal failure and maximize equipment life.

Key factors to consider:

Fluid to be sealed → determines the appropriate material
Working temperature → determines the appropriate material.
Working pressure → conditions hardness and extrusion resistance.
Operating conditions → Static or dynamic.
Regulations → Compliance with specific standards.

FAQ's about O-rings

What is the service life of an O-ring?

It depends on the material and conditions of use. In optimal conditions, they can last several years without deterioration.

How do you know which material to choose when selecting an O-ring?

Some key factors should be considered when choosing an O-ring material. Among these factors are the type of fluid to be sealed, the working temperature, the system pressure, the operating condition, etc...

Do O-rings need lubrication?

In dynamic applications, proper lubrication reduces wear and prolongs service life.

Can O-rings be custom made?

Yes, Epidor offers custom fabrication for each application.

What are the most common installation errors?

Use of improper material, installation torques or lack of lubrication can cause sealing failure. Consideration should also be given to not stretching more than 6 % of its diameter in the assembly.