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Threaded Flange

Threaded flanges are probably the most recognisable of all flanges due to their screw thread design that is used to connect it to the pipe. Threaded flanges, also known as screwed flanges (for obvious reasons), require a male and female thread to create a connection...

Slip On Flange

A slip-on flange can also be known as a hubbed flange, which, as the name suggests, has a hub with a very low profile. Why is this important? Because this type of ring type joint gasket has an internal diameter larger than the connecting pipe, allowing you to slide it...

Weld Neck Flange

Also known as tapered hub flanges or high hub flanges, weld neck flanges are a specific type of gasket with a protruding ridge and long neck used to connect pipework and provide you with a high-quality seal. Weld neck flanges, in particular, are a popular choice when...

Nitrile vs Viton® – What is the Difference?

As you start to make a decision about what type of O-rings to purchase for your business, you might wonder what material is the most suitable for your unique needs. Every business operation has different requirements for their O-rings, such as the temperature,...

Aflas vs Viton

When it comes to choosing O ring suppliers in the UK, you’ll find that there are a wide range of materials on offer for you to choose from. Many people find that the options can seem quite overwhelming, with some materials having similar properties but offering...

EPDM Gasket

Both the automotive and construction industries have started to use EPDM gaskets more frequently in recent times. This rubber material is UV light resistant and has many fantastic properties that make this part highly effective for a wide range of processes. Keep...

Metal Gaskets

When comparing gaskets for use within your business processes, you’ll find that these can be made from a variety of materials. Metal gaskets are a very popular option, offering many advantages over other materials. When looking at sealing product options, make sure...

AFLAS o ring

O rings come in many different dimensions, thicknesses, and materials. And it is the various different materials that o rings can be manufactured from that make each o ring unique and suitable for specific applications. In fact, there are hundreds of different types...

O Ring Vulcanization Process

With years of o ring knowledge and experience in o ring vulcanization, we're one of the leading experts in providing the right sealing solution for you. To view our full range, visit our O-ring product page, with a wide selection and something to match every...

What is a Window Seal?

A window seal is something that nearly all of us will have seen in our homes or workplaces and is designed to help make your building more comfortable. Within our range of Sealing Specialist Products, we offer a selection of window seals designed for various...

See our latest catalogue for all the services we offer.

O Ring Colour Identification

O Ring Colour IdentificationO rings come in various colours, and it’s important to understand what these colours indicate as the o rings you choose will affect your overall process application. 

Ultimately, different o ring colours are used to help differentiate between different materials. 

Specialist Sealing Products can supply a range of o rings in all colours, utilising a range of materials. 

The good news is we have our o rings available to order directly online HERE; however, if you have specific queries relating to o rings, their colour, and their materials, call us on 01535 274 776 or check this page to know more about information about o rings. 

Yellow, black, and green o rings 

Black o rings 

Manufactured in EPDM, black o rings are most suitable for applications such as heating, fire prevention, drinking water, and sanitary water. 

They are compliant with EN 681-1 standard and come with SECURFRABO patented system security. 

They can also withstand minimum temperatures of -10 degrees and maximum temperatures of over 110 degrees. 

Yellow o rings 

Manufactured using HNBR, you will find yellow o rings used in gas applications, compliant with the standard EN 549. 

These standards are also split, i.e., EN 681-1 yellow o ring for water, and EN 549 yellow o rings suitable for gas. 

Patented security system SECURFRABO. 

The yellow o rings’ minimum temperature for water and gas can reach -20 degrees, with a maximum temperature of +95 degrees. 

For those o rings that are gas only, minimum temperatures reach -20 degrees, and their maximum temperature can reach +70 degrees. 

Green o rings 

Manufactured using FKM materials, these o rings operate perfectly at high temperatures and fluctuating stress levels – making them ideal for systems such as solar. 

Their maximum temperatures reach 160 degrees but can peak at 200 degrees for short periods if required. 

O ring colour coded 

O ring colour/O ring material 

Black/FFKM, NBR, EPDM, Viton, Alfas, Neoprene 

Green/HNBR, HSN, Viton 

Blue/Fluorosilicone 

High Visibility Green/NBR 

Brown/Viton 

Red/Silicone, PFAS, TES 

Clear/Urethane 

White/NBR, Viton, Silicone, EPDM, PTFE 

Yellow/NBR 

Each o ring material offers various properties, making them suitable for different applications and processes.  It is important to opt for the most suitable material to provide the best seal for your application. 

Different o ring compounds are recommended for sealing, as new and innovative materials are identified and used as suitable sealing products. 

As previously stated, colour coding o rings in this way has allowed the industry to distinguish between different types of materials and, most importantly, improve their visibility in applications. 

Sometimes coloured dots can also be applied to o ring batches to help you with your own inventory. 

Keeping everything organised and in a systematic order.  (Note: These markings are not permanent and are for your own reference only). 

SSP can help with colour coding if this is an element you would like to include with your o ring order. 

Difference between black o rings and green o rings 

Black o rings are primarily neoprene or Nitrile or, in some cases, a mix of the two materials.  Black o rings were primarily the only coloured o rings around prior to 1987; however, as new materials come onto the market, different colours were required to identify the different materials in use, marking out their visibility and allowing businesses to check their suitability for specific and different applications.  Black o rings are most commonly used for auto air conditioning applications. 

Green o rings are hydrogenated Nitrile, also known as highly saturated Nitrile, or more commonly known as HNBR. These o rings have the green colour moulded into their rubber and were introduced with the refrigerant of 134a, suitable for high temperatures and fluctuating stress loads. 

There is a call to simplify the o ring colour selection process; however, currently, these colours provide a clear picture of changes taking place. 

Specialist Sealing Products provide a range of o rings and can help with colour coding for inventory management.  Our knowledgeable, experienced, and friendly team is on hand to help find the most suitable o ring material for your application. 

Call us today on 01535 274 776 or visit our stock pages online to find out more click the button below.

Find Out More Here!

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