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O-rings suitable for the pharmaceutical industry

O rings are widely used across various industries to support a variety of different pieces of equipment and applications.  They provide an essential function and are ultimately moulded and manufactured to ensure they provide a continually high level of quality through...

The Best Chemical Resistant Gaskets for Sulfuric Acid

If you are using sulfuric acid on a regular basis within your industry, you might be aware of how corrosive it can be. While it can be useful for dyes, explosives, fertilisers, and many more applications, finding a chemical resistant gasket can often be one of the...

Different elastomers for o rings and various applications

An elastomer is a primary raw material used for most o rings. They are typically manufactured as gum rubber or manufactured synthetically, and surprisingly today, there are approximately over 32 different synthetic rubbers now available.  Elastomer compounds will...

Spiral wound gasket thickness – what’s best?

It is often recommended that using a thinner gasket type/material will result in better sealing performance.  Why?  Because thinner gaskets tend to require much less gasket stress to provide applications with the perfect seal, they also have an excellent response to...

Choosing the correct oil seal application

Choosing and using the proper sealing devices within oil and gas applications can be vital when preventing dirt, dust, water, and other debris from potentially getting inside and contaminating products.  Of course, all rubber materials and seals will provide a range...

Nitrile rubber, NBR, and Buna-N – how well do you know your o ring materials?

A widely used elastomer, Nitrile, Buna-N, or NBR rubber, are all oil and fuel resistant and provide a great level of strength, making them a popular material for seals across various industries.  Suitable for a range of applications, this versatile rubber material,...

Optimum squeezing force for an o ring

It is true that the more squeeze you place on an o ring, the tighter the seal it will provide. In essence, the more squeeze (compression) you apply, the greater the force between the o ring and its mating hardware.  And ensuring you have the perfect seal is all...

O Ring Squeeze

The squeeze and shrinkage on an o ring are vital to understanding as these factors stand in the way of your application either experiencing a perfect seal or your application suffering from leaks.  You can measure the shrinkage of an o ring during...

Keeping your o rings bonded

EMI o rings. Those seal ring gaskets are made of silicone compounds, combining environmental sealing with electromagnetic interference protection.  Consisting of metal or metal-coated particles, silicone o rings are filled with silver, silver aluminium, or nickel...

The importance of mechanical seals when reducing water consumption in mining

Environmental considerations are at the top of most industry's agendas in the 21st century as companies evaluate and improve operations, processes, and systems.  Conserving water in mining is one such area that is now being investigated further with the rotation of...

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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