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Rubber O-rings – Guide on O-rings and other Technical Seals

Our present article aims to explain the concept of rubber o-rings. By reading the current entry, you will also learn about other technical seals operating on our Polish market.

O-ring– what is it?

When answering the above question, it is worth quoting the available definition of o-rings:

Theoretical part: o-rings

O-ring, also called O-ring.

A type of ring-shaped gasket.

Practical part: O-rings

So let’s go back to more useful information about o-rings than defining them.

As is commonly known, o-rings are the most popular technical seals.

What is the reason for having the title of the most popular technical seals?

In order to answer this question, we will break it down into the following components:

Ease of use – Easy assembly of O-rings

If we have already had contact with rubber O-rings, we know that their installation is one of the simplest activities. This is largely due to their flexibility, which is much appreciated nowadays.

A wide range of O-ring sizes

The wide availability of sizes, from any internal diameter to the cross-section (commonly known as the O-ring thickness), allows you to quickly find the right size, according to our needs.

Here it is also worth adding about the wide range of rubber compounds available, which allow to increase the service life of these basic technical seals, although we will write about this part in one of the next sections.

O-rings and the price

Due to the fact that we are Poles, the price does matter for us. Also in the case of O-rings valuations – the price has a positive effect on their demand. The cheapest gaskets can be purchased from PLN 0.39 (in words: thirty-nine groszy) per piece in retail sales. The prices at the POWER Rubber O-ring wholesaler are even lower! It is worth sending inquiries by e-mail:

Basic information for the entry: oring

In this section, we will devote time to providing, or rather recalling the basic information, features related to rubber O-rings.

O-rings and their markings

There are several ways of marking O-rings on the market. One of the easiest for the user is the designation we use (POWER Rubber – the Editor reminds us).

What is the marking for o-rings?

The o-rings in POWER are marked as follows:

Inner Diameter to Thickness (be it, as we mentioned earlier, the section or the height).

Would it be nice to see an example of the marking for the o-ring on POWER Rubber?

Of course it is! Here is a simple example of an O-ring with an inner diameter of 5 and a height of 2. With us, such an O-ring has the following designation:

O-ring 50x6 FKM made of FKM

Here you can buy Rubber O-rings – manufacturer

O-ring dimensioning

Following the markings and the dimensioning of O-rings, the best source of knowledge on this subject is our dedicated technical article:

How to dimension O-rings We invite you to read

What other basic information about the O-ring should be known? What will be useful for most Users?

What we should pay attention to are the compounds of which the O-rings are available.


Types of Rubber O-rings – O-rings, Materials and Mixes

Here we have two options:

  1. We invite you to our article, where you can check the widely available rubber mixtures for basic technical seals – not only O-rings, it is worth mentioning at this stage. Link to the technical article:

Rubber O-rings – Everything you need to know

  1. The second option is to review the following brief characteristics for each of the individual basic rubber compounds.


NBR O-rings – Perbunan® O-ring

oring nbr

The NBR O-ring is a technical seal made of synthetic rubber, officially acrylonitrile-butadiene rubber, intended for contact with hydraulic oils.

Temperature range: -20 ° C to + 90 ° C

Example of use: common places of the cheapest O-rings, e.g. seals for oil containers.

Attention! POWER Rubber does not recommend the use of NBR O-rings on the inside of motors. For this type of application, it is worth choosing Viton® o-rings – details can be found in the next section of this article.


FKM O-rings – Viton® O-rings

O-rings viton FKM FPM fluoro rubber

An example of a fluorine blend which is a superior model of NBR blend. It has greater chemical resistance and a higher temperature range than NBR. Recommended for contact with mineral oils.

Temperature range: -14 ° C to + 250 ° C

Application example: Seals inside motors.


Oringi HNBR – O-ring Therban®

O-rings made of hydrated acrylonitrile-butadiene rubber, HNBR for short. The material is designed to work with oils and greases or ozone.
It is worth mentioning here that the material has a higher resistance, especially to abrasion, than NBR.

Temperature range: -21 ° C to + 150 ° C

Example of use: O-rings in contact with oil, requiring frequent disassembly.


EPDM O-rings – Dutral® O-ring

O-rings epdm

EPDM O-rings are gaskets made of a mixture of ethylene-propylene-diene rubber. Seals made of this material are intended for operation in conditions related to weather, contact with water, exposed to solar radiation.

Temperature range: -41 ° C to + 125 ° C

Temperature range for the supernatant mixture:-50 ° C + 150 ° C

Example of use: sealing in steam boilers and compressors, or in contact with ozone.

Neoprene O-rings – CR O-ring

Neoprene o-rings are one of the newest technologies on the market. They show a combination of EPDM and NBR blend features.

What does it mean?

This means that they can be exposed to UV radiation while maintaining their resistance to contact with oils.

Temperature range: -40 ° C to + 100 ° C

Resistant to contact with freon and ammonia.



Silicone O-rings – Elastosil® O-ring

silicone o-ring

O-rings made of a silicone compound have two markings:

VMQ O-rings with working environment:-55 ° C to + 225 ° C and
FVMQ flurosilicone O-rings, the scope of which is from -20 ° C and up to + 300 ° C

Silicone O-rings can have FDA certification, i.e. certification that allows the use of O-rings in the food industry.

Application example: food line seals with liquid application, silicone rubber seal for contact with drinking water.

The silicone oring is usually a FDA (Food and Drug Administration) certified seal – approval for the contact of rubber products with food
(in accordance with EU directives


FFKM O-rings – Kalrez® O-rings

O-rings made of FFKM or FFPM compound. Officially Perfluorinated rubber known as Kalrez®

FFKMrings are characterized by very high chemical resistance and a wide temperature range. Depending on the model, the temperature range is from -42 ° C to + 325 ° C

Basic models are marked as: 0040, 0090, 1050LF, 3018, 4079, 6221, 6375, 6380, 7075, 7090, 9100. You can read about everything here: Kalrez


Oringi PTFE –Poli (tetrafluoroetylen) Teflon®

PTFE o-rings are gaskets made of a rubber mixture most closely related to plastic due to the fact that they are made of Teflon®. This allows to obtain O-rings resistant to heat, cold, corrosive chemicals and to be used in places where a low coefficient of friction is required. Certified for contact with food.

Temperature range: -200 ° C to + 260 ° C

Compression and friction resistant.


O-rings in lagging – O-ring FEP PFA

These are O-rings covered with a Teflon layer to increase chemical resistance.

Temperature range: -60 ° C to 260 ° C

Example of use:

  • connection in pipeline systems on oil rigs
  • seals with low friction (low rolling resistance)
  • chemical-resistant seals
  • o-rings for rotary motion


As you can see, we have presented the basic rubber compounds from which technical seals are produced. Now let’s ask ourselves:

Is there anything else he should know about seals?

We answer: Yes, there is one key topic worth mentioning, namely:

rubber O-ring seals

Hardness – rubber O-rings


O-ring hardness is one of the most overlooked aspects of these flat seals. Many specialists forget about the consequences of incorrect selection of the correct hardness of O-rings.

How is the hardness of O-rings determined?

O-rings, and more precisely their hardness, is determined on the Shore A scale.


O-ring 5×2 70 Shore A means: O-ring which has a reading of 70 on the Shore A scale (abbreviation: ShA).

What does 70 ShA mean, is that a lot?

The standard O-ring value is 70 ShA. It is a universal value. Below this value, O-rings or other seals are softer: e.g. 50 ShA, and above 70 ShA, e.g. O-rings 80ShA or O-rings 90ShA are harder variants.

What does the hardness of the O-rings affect?

And the whole thing: hardness affects the pressure resistance.

What does it mean?

This means that with increasing pressure in the equipment where the seal is to be installed, the seal should have a higher hardness.


Are these all the topics? Due to our vast knowledge, we will be happy to share information about colored O-rings.

Colorful o-rings

oringi kolorowe

Each of us gets used to the colors, be it the color of clothes or accessories in everyday life. We know that for outfits where we want to look elegant, we put on a white shirt, and for casual outings, we can allow ourselves a little deviation from this rule. Despite the hard rules, there are soft rules in life, especially about colors.

Best example:

Red is always faster

Why is it so accepted? – we will ask

This is because most sports cars in the previous years had just such a color, a color that at the same time made us aware of the vehicle brand.

Is it not possible to have a fast car nowadays, but a color other than red?

After a moment of reflection, each of us will answer: you can have a fast car in a different color. The current development of technology allows for all sorts of variety, including the possibility of choosing any color from the RAL palette (international color chart). It all depends on the cost.

The same is true for O-rings and other seals. In fact, we are able to offer any color of o-rings for any purpose, but it is worth considering whether we can use standard colors such as black or green for o-rings, which are the common color for each of the mixtures. Additional advantages are the lower target price due to the use of standard color.

Why use colored O-rings?

So what is the purpose of using colored O-rings?
Here we can give you some examples from our experience in consulting technical seals.

  • Transparency in the selection of parts
    Marking with a variety of colors reduces the possibility of errors in the picking process or the control process
  • Aesthetic values
    When the sealing ring is mounted in a visible place, it is worth taking care of the aesthetics and choosing the right color – the color according to our taste or the target customer.
  • Differentiation of rubber mixtures
    The choice of individual colors, such as green O-rings or red O-rings, allows you to specify the mixture from which they were made by default. And so, as standard – as we emphasize – we know that the brick-red red seals are mostly rings made of Silicone, i.e. a VMQ mixture.


What do the colors of the O-rings mean? Check accepted standards

In Poland, we have assumed that each color is a different material. As it was explained above, we can use seals of any color and its properties, although the Oldest Highlanders have the following applications remembered for each color of the o-rings. And so we can assign:

Viton O-rings

Black O-rings


Black o-rings – any of the available mixtures can be hidden under this name. The most common are NBR rings or Viton® seals, but also EPDM O-rings.

Where can we find black o-rings?

In most common places where O-rings are used. At the battery sink, on the bike, or in basic functions, where rubber seals perform sealing functions.


Brown O-rings


The brown color for O-rings is the color used in rings made of a mixture of Viton®, FPM and FKM.


Red O-rings

red o-ring

Red o-rings are commonly used silicone o-rings made of the VMQ compound.

Green O-rings


Green O-rings are the color assigned to a mixture of EPDM and HNBR. O-rings for use in air conditioning.


White O-rings


The White O-rings are silicone rings. They come in two versions as standard: transparent and milk white. This color is also assigned to Teflon products, the abbreviation of which is often marked PTFE.


Blue O-rings

Blue O-rings

Blue o-rings are a rarer sight. However, such non-standard gaskets are also available in our offer.


Yellow O-rings

Another, still rare, color for technical seals is Yellow. However, we also offer a Professional Approach here as a manufacturer of rubber products.

Advice for people looking for yellow O-rings: please contact us to agree on dimensions and use.

Silver o-rings

Silver o-rings

Even less common seals are those in silver, but the most important thing is to satisfy the customer.

Silver gaskets – Dedicated to the customer’s order

Back then, we had the opportunity to deliver silver-colored gaskets.

It must be admitted that it is a very unusual color for rubber products. Much more related to steel alloys, therefore the use of this color was needed: Reducing the visibility of the use of O-rings in the outer layer of the device.

We are glad that another production company joined the group of satisfied customers of POWER Rubber.


However, there will always be a Person who will ask:

What is the difference between green and black oring?

O-rings epdm

When we want to explain the differences between green and black O-rings, then we can help others:

  1. By recommending this article where it is all described.
  2. Prompt the e-mail address to specialists from POWER Rubber
  3. Provide the telephone number to Specialists from POWER Rubber: +48 505 16 03 03

As you can see, the colors of the O-rings are optional according to the customer’s needs. The manufacturer of rubber O-rings and products can advise on the use of appropriate mixtures. You can choose from the following types of rubber: NBR, FKM, FPM, EPDM, HNBR, Silikon or FFKM, and o-rings in a seamless cover, most often known as FEP o-rings.

Check here: norms and standards adopted for O-rings

O-rings – Application

Due to our experience and contact with customers, we will present the most common places of use for seals. Our extensive experience helps us in this, which consists not only in selling gaskets as a rubber shop with o-rings, but also as professionals who select technical seals for their machines and devices. We adjust rubber seals to the grooves we already have, but we also design grooves thanks to our knowledge of how to choose the O-ring for the groove. So let’s check where we can most often find our rubber gaskets with a cross-section of

Rubber o-rings – keyboard


Computer keyboard – an element of equipment in almost every house, apartment or office. Both acting as an external keyboard, but also as a keyboard that is included in our laptop. Of course, we are not talking about touch models here, but those with keys.

Where are the rubber o-rings in the keyboard?

As it turns out, the rubber rings are just below the keys. It is worth noting that you should carefully disassemble the keyboard buttons to install the O-rings.

Mounting o-rings to the keyboard

Here it is worth using a special tool for extracting the keys. It is easy to damage them. For this purpose:

  1. We challenge the key – single, one piece
  2. We take out the button
  3. We install the keyboard o-rings bought in the POWER Rubber o-rings by installing the o-rings on the keys from their underside.
  4. We check if we have done the installation of the rings correctly
  5. We put the key in its place in the keyboard
  6. Repeat the action for each button

And this is the correct O-ring assembly instruction for a computer keyboard.

Advantages of computer keyboard O-rings

What is the function of o-rings in the keyboard? We answer this simple question with the example of a short story:

Imagine that you come to your home after a hard day at work at your computer. A house with peace and quiet. Imagine that, right after leaving your stuff at the door, you take off your shoes and rush to the chair just to relax. You sit down and relax, and then suddenly: in all the silence, you hear a gentle tap on the keyboard. Initially soft sound, turns into a bothersome sound, and so the moments of relaxation passed.

What was missing in the given situation?

There are no O-rings for the keyboard.

As you can see in the story description above, the o-rings on the keyboard mute the sound of the keys. They increase the comfort of work by reducing the noise occurring when writing and using a laptop and a desktop computer. Thus, it is worth investing in for inner peace.

Rubber o-rings used in motor vehicles, water vehicles and aircrafts

As it turns out, there are plenty of uses for these gaskets. This allows you to discover them in various places. And so we can meet them both in passenger cars, water vehicles and even airships.

Let us ask ourselves: what does this result from?

This is due to:

  • wide range of sizes available: large, small, skinny and thick
  • available colors – white, black, green, red, blue or transparent
  • available rubber compounds, the right choice of which can help in sealing, especially in special tasks

Following this lead, our rubber seals can be found in many places of these vehicles and ships:

  • engine
  • O-rings for injectors
  • turbo hose O-ring
  • thermostat o-rings
  • drive element
  • in the steering wheel
  • in the ignition device
  • in the mirror
  • in the drive motor of seats, seats and electric mirrors
  • in the loudspeaker housing

Our list is growing! Feel free to submit your ideas in the comments!


Seals in the tap

Who among us does not remember a situation when our faucet – whether it’s the kitchen faucet or the one in the bathroom – started to leak? Drop by drop, until complete damage and a steady stream of water.

Battery seals

What is the cause of a leak in the bathroom faucet?

What causes the seals on the washbasin faucet to leak?

Most often, the cause is damage to the battery seal.

How do I fix a leaking battery?

To stop repairing a battery leak, just make the following action plan:

  1. We remember which way the hot water is.
  2. Save it on a piece of paper or on your phone.
  3. We turn off the hot water valve for a given tap. We mark it with a marker.
  4. Turn off the cold water valve to the tap.
  5. Unscrew the hot water hose
  6. Unscrew the cold water hose
  7. We remove the cap – showing which way we should turn on the tap to get cold, warm, lukewarm or hot water. They are covering a small screw. Sometimes it is worth using a screwdriver or pry it with a knife.
  8. We take a set of ampoule keys.
  9. Unscrew the visible screw.
  10. Take off the upper part of the tap with a strong movement.
  11. Unscrew the tap from the bottom using – most often a 10 or 8 flat wrench.
  12. Disassemble the battery – depending on the model, these are two screws or one large screw.
  13. We take out the damaged gaskets from the valves.
  14. We install o-rings from POWER Rubber.
  15. We twist one large bolt, or two smaller ones.
  16. We screw the tap to the countertop or the washbasin, if we are talking about a bathroom faucet.
  17. Attach the top handle that allows you to change the temperature – that is, to decide on the share of individual water streams.
  18. We tighten the small screw, with the Allen key – the Allen key.
  19. We stick an information label – at the beginning it was worth to write down which way we have hot water in order to put the plug properly.
  20. Screw on the cold water supply hose.
  21. Screw on the hot water supply hose.
  22. Open the cold water tap.
  23. We check the tightness of the tap.
  24. Open the hot water tap.
  25. We check the bathroom faucet or washbasin faucet for leaks again.
  26. We boast about making the right repair.
What if the leaking sink tap is still there?

If, after our replacement, unfortunately, the battery continues to leak, we have two options:

  • Incorrectly installed battery seals – which is unlikely
  • Faulty valve in the battery – as we know, manufacturers use cheaper and cheaper solutions to get more sales. Thus, they limit the use of high-quality products – here we can talk about a widely understood and known treatment known as: the aging process.

For the second case, we have two solutions:

  1. Purchase of a new valve for the battery. Then go through our manual again.
  2. Purchase of a new battery. If we are talking about high-end batteries, then choosing the first solution will bring us much greater savings. This is due to the more expensive materials included in the battery construction used by the manufacturer.

Rubber o-rings – POWER Rubber shop

We invite you to take advantage of the opportunities available online in our online store with mail order sale. Usually with delivery by courier on the next working day.

Our high inventory levels allow us to provide express deliveries. They also allow wide access to metric and inch O-rings.


Where to buy rubber O-rings?> POWER Rubber <-


O-rings – A shop with rubber goods in Pruszków, close to the capital city of Warsaw

For the convenience of our customers, we have launched a stationary store in Pruszków – close to the capital of Poland Warsaw – at ul. Domaniewska 5A. The store is located close to the S8 A2 junction, Pruszków exit. It is equipped with the most common sizes and rubber products such as:


Best regards,


Rubber products online store

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