O-Rings of NewDealSeals

An O-rings is a torus shaped seal placed between two parts to prevent the passing of fluids and gasses. It is an efficient sealing element for both static and dynamic applications. In industries from aerosol to aerospace, O-rings are the most commonly used seals in the world. Why? Because they are effective, economical, and easy to use.

Although the O-ring is a simple sealing concept, there are many factors to take into account when selecting the right O-ring for a specific application. Our O-ring Technical Handbook explains the factors involved when selecting the right O-ring.

We deliver O-rings according to or any custom size/tolerance required. O-rings are also available in accordance with different standards(AS 568A, DIN 3701, BS 1806/ BS 4518, JIS B2401, JIS NFT47-501, SMS 1568 and ISO 3601) and with various approvals (KTW, USP, NSF 51 61, WRC, WRAS, FDA, R67 01).

Stock O-Rings Download Handbook
Teflon® coated o-rings Blue rubber o-rings
Teflon® coated o-rings
Blue rubber o-rings

Rubber O-Rings

The selection of the right material is crucial for the appropriate applicability of an O-ring. NewDealSeals has all basic materials available with more than 500 rubber compounds. We gladly advise you with making the right choice.

Presented below, the most commonly used O-ring materials. All other basic materials such as FVMQ, HNBR, PU or CR can be found on our rubber materials page.

Black NBR o-rings

NBR, Nitrile O-Rings

Temperature range (-40 to 108 °C). Low material price, good oil resistance and good mechanical properties.

NBR, Nitril
Yellow silicone o-rings

VMQ, Silicone O-Rings

Temperature range (-54 to 232 °C). Very suitable for mineral oils. Good flexibility, low compression set, ozone and UV-resistant.

VMQ, Silicone
Green FKM Viton® o-rings

FKM, Viton® O-Rings

Temperature range (-25 to 204 °C). Very good resistance to chemicals, oils, ozone and UV. Suitable for static and light dynamic applications.

FKM, Viton®
White FFKM o-rings

FFKM, Fluorezi® O-Rings

Temperature range (-30 to 325 °C). Superior chemical resistance to meet the most critical requirements.

FFKM, Fluorezi®
Black EPDM o-rings

EPDM O-Rings

Temperature range (-55 to 150 °C). Good resistance to steam, brake and hydraulic fluids.

Black Aflas® FEPM o-rings

FEPM, Aflas® O-Rings

Temperature range (-20 to 204 °C). Unique chemical-, heat resistance and electrical resistivity.

FEPM, Aflas®

O-ring Options

Back-up rings with blue o-rings

Back-Up Rings

Back-up rings are used to prevent extrusion of O-rings in high pressure applications.

Back-Up Rings
PTFE coated o-rings

Coated O-Rings

Elastomeric O-rings can be coated to improve the chemical resistance or friction properties.

FEP encapsulated o-ring close up

FEP, PFA O-Rings

FEP/PTFE encapsulation provides high chemical and temperature resistance while maintaining its resilience.

FEP, PFA Encapsulated
Red silicone hollow o-ring

Hollow O-Rings

Hollow core O-rings can be used in applications where low closing force is available.

Hollow Cord Rings

Advantages O-Ring

  1. Reliable sealing solution
  2. Simple mounting requirements
  3. Suitable for high and low pressure applications
  4. Relatively cheap

Advantages NewDealSeals

  1. More than 500 elastomeric compounds available
  2. Seamless O-Rings available from ID 0.4 – 2000 mm
  3. 100% controlled production process
  4. Polymer laboratory dedicated to the development of custom compounds
  5. Engineering support (design, development, failure analysis & reverse engineering)

How does the O-ring work

An O-ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. When placed under pressure, the O-ring is forced to “flow” within the groove toward the clearance gap. As the O-ring flows against the gap, it produces zero clearance and prevents the sealed substance from escaping.

Staying in shape

An important factor in the effectiveness of any O-ring is its memory, or ability to remember its shape. O-rings are made to always try to regain its original shape despite being squeezed and/or distorted by pressure. O-rings are used for a wide range of applications and environments. An O-ring is a simple concept, but there are over 20 types of materials with more than 500 compound types to choose from in virtually any possible size. The right material and design choice is critical for staying in shape.

Alternative Products

O-rings are ideal for a wide variety of applications but they cannot solve every sealing design project. For this purpose NewDealSeals has a range of alternative seals available that can be used into standard O-ring groove designs.

Blue FKM D-ring


Key Advantages

  1. Minimized risk of spiral failure
  2. High extrusion resistance
  3. Easy to install


Key Advantages

  1. Space included for lubrication
  2. Low friction
  3. Improved stability

Metallic Seals

Key Advantages

  1. High temperature range (-269 up to 980 °C)
  2. High maximum pressure (Up to 10.000 Bar)
  3. Low gas permeation
Metallic Seals
Blue PTFE spring energized seals

Spring Energized Seals

Key Advantages

  1. Great chemical resistance
  2. High temperature range (-150 up to 260 °C)
  3. Can be used for dynamic applications
Spring Energized Seals

O-Ring Client Cases

Class A+ O-Rings

1. The Challenge

Can you improve dimensional tolerances of Aerospace class A O-rings?

2. The Process

Standard industrial O-rings are being produced according to class B or A tolerances.

Class A O-rings have tighter inside diameter tolerances then class B O-rings and are suitable for industrial or aerospace applications when the application or the housing require tighter tolerances.

In order to further improve our class A O-Rings it was needed to create a new precision multi point injection moulding production tool. The new tool in conjunction with our  latest injection moulding machine and a slightly revised FKM compound formulation further reduced tolerances of our class A O-rings by 35%!

Tolerance example:

  • Class B O-ring 36.09 X 3.53 (Tolerances ±0.38 X ±0.10)
  • Class A O-ring 36.09 X 3.53 (Tolerances ±0.30 X ±0.08)
  • Class A+ O-ring 36.09 X 3.53 (Tolerances ±0.22 X ±0.06)

3. The Result

Reduction dimensional tolerances by 35% compared to class A O-Rings
No cost increase due to optimized automatic production process.
A satisfied customer!

Permanent Marking Identification

1. The Challenge

Can you add a permanent marking identification on O-rings?

2. The Process

Most standard industrial O-rings are being produced in the color black due to the presence of carbon black. With the addition of pigments we can nowadays create O-rings in almost each RAL Color. Colors are primarily used to identify different O-rings materials or compounds. In some situation it might be beneficial to add another permanent marking in order to identify whether an O-rings is an original spare part or not.

For this reason NewDealSeals developed a technique where we can add small colored inlay into the O-ring production process.

3. The Result

  • Successful introduction of a tracer inside O-ring compounds.
  • No cost increase due to cost effective tracer ingredient.
  • A satisfied customer!

O-Ring Tracers

1. The Challenge

Can you easily detect original spare parts from non original copies?

2. The Process

NewDealSeals supplies millions of O-rings to famous companies such as HITACHI, EMERSON & the Volkswagen Group. In order to protect the quality of spare parts NewDealSeals was invited to find a solution to easily detect original spare parts from non original copies. Together with our client we gather all needed information and developed a custom  compound range with a unique tracer inside the O-ring material. With the existence of the tracer it is easy to detect whether the O-ring is original or not. This will further help our clients to protect themselves against claims and potential losses on the spare part market.

3. The Result

  • Successful introduction of a tracer inside O-ring compounds.
  • No cost increase due to cost effective tracer ingredient.
  • A satisfied customer!
Blue rubber o-rings
Blue rubber o-rings

More recent projects:

Blue rubber o-rings

Design Process

Step 1

Collect input

Step 2

Product selection

Step 3

Material selection

Step 4

Dimensional design

Step 5


Step 6


Collect input

Relevant application input is being collected. Such as:

  • Exposed media(Chemicals, pressure, temperature)
  • Required dimensions
  • Application type (Dynamic, static)
  • Design options (surface roughness, maximum gap)

Product selection

Based on the input, the product engineer selects the most suitable product. These can be products such as: O-rings, Flat gaskets, Metallic seals, Custom moulded parts, PTFE spring energized seals. In many cases, the O-ring is a convenient sealing solution.

The upcoming steps in this design process are focused on an O-ring.

Material selection

When an O-ring is chosen in step 2, the material selection is made based on the relevant application information. Sometimes additional coatings, encapsulations or back-up rings are applied to meet the customer demands.

The specific environment of the customer’s application can be replicated in a laboratory test to predict the performance of the O-ring prior to performing a field test or using the O-ring in the actual application.

Dimensional design

After the O-ring material choice has been made, the O-ring size and groove dimensions are defined. Depending on a series of parameters like application type, expected rubber swell and available space, the right O-ring and corresponding groove dimensions are chosen.


After the design is complete, the production takes place. Depending on the material, size and quantity, the production method is chosen. Each O-ring is checked after production.


After the O-ring is produced, it is ready for use in the customers application. Our customers work with different approval procedures. Approval procedures can include a simple dimensional check, but also laboratory tests and field tests. After approval by the customer, the series production is started.

Production Process

Basic Material

NDS delivers over 500 different rubber compounds. All Incoming rubber compounds are checked in the laboratory prior to approval for the moulding process.

Once the rubber is approved, the rubber is stored in a temperature and humidity controlled area. Correct storage is essential due to the fact that the basic material has a limited shelf life. Each compound has a different shelf life, once the shelf life has expired, the compound cannot be used for processing.


Raw rubber compound is moulded into O-rings using injection or compression molding.

Injection molding is commonly used for small O-rings. Compression molding is used for large >Ø250 diameter O-rings and special rubber types.

NDS makes use of single-point injection moulding machines, to efficiently and quickly produce small series and large multi-point injection moulding machines for high volume articles.

NDS uses special multi O-ring size tools, to efficiently and quickly switch between different sizes to optimize the production cost and time.

As are result the production facility runs 24 hours a day, 6 days a week and makes over 5.000.000 O-rings each day.


After the moulding process, the O-rings are still surrounded by rubber flash(burrs) of the moulding process.

Deflashing is done by use of cryogenic deflashers, sanding machines or a combination of these.

  • Cryogenic deflashers use low temperatures to make the parts brittle. By shaking or rolling the parts, the flash breaks from the Oring.
  • Sanding machines use tiny balls in a turning machine to grind off the flash of the O-ring.

Post curing

After the deburring process, the O-rings are ready for post curing. Post curing is a process where the items are heated for a certain period of time to control the completion of the vulcanization process.

Post curing gives the O-rings, their final requested mechanical, and chemical characteristics.

Visual inspection

Automatic inspection machines are used to efficiently and accurately check O-rings for any defects. All O-rings are inspected on the following measurements and defects.


  • Inner/outer diameter
  • Cross section


  • Flash
  • Nicks
  • Roundness

Test report

Finally a test report is made for each batch with all measurements and any extra customer specific requirements.