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Why Should You Invest in Quality Seals?

While industrial seals might seem like something you could save a little money on, this is one part that we don’t recommend cutting costs on. A quality seal will offer many benefits to your business and operations, so it’s worth taking the time to find a solution...

All you need to know about Neoprene O rings

Popular in the refrigeration industry, neoprene o rings are also growing in popularity across a wide range of other sectors due to their incredible resistance to hazardous materials. Also known as chloroquine o rings, these o rings provide excellent resistance to...

Why all sealants are not the same

It's important to understand just how critical it is to use the correct type of sealant. It's especially the case when working with heavy machinery or any industrial situation. You don't want to have to worry about whether your sealing products are working correctly...

How to understand O-rings and their design

O-Rings are a critical component for the proper sealing of specific pipes. They have to sit within a specified groove, which can vary based on the hardware used. That's why it's important to note the various types of o-ring groove design to understand better what kind...

The importance of gasket thickness

Choosing the right gasket material for specific applications is vital. However, gasket thickness is also a feature that must not be overlooked in the decision-making process. Choosing the right gasket thickness can help when you’re experiencing challenges with...

How Temperature Impacts Gasket Performance

When using a spiral wound gasket, there are many things you need to keep in mind. The most common issue we hear people discuss regarding gasket performance issues at high temperatures. If you are using a gasket for the first time at a new temperature and notice it...

How Thick Should Gasket Paper Be?

When creating gaskets, one of the most common questions we receive is regarding gasket paper thickness. You’ll find there are various options on the market, which come in different sizes and thicknesses. Today we’re going to discover what gasket paper is and how you...

O-Rings for the Beer Industry

O-rings offer a wide range of applications, and many people aren’t aware of just how versatile an o-ring can be. When working with o-ring suppliers in the UK, you’ll soon find out that we supply these to a range of businesses, including to breweries. Today we’re going...

Gasket Safety

Gaskets and seals are vital components for applications requiring a solid seal, helping prevent leaks and stop gases and other chemicals from escaping.  However, over time, and due to the fluctuating temperatures, compression sets, and exposure to chemicals, seals do...

Is fluorosilicone rubber o rings a sustainable choice?

Fluorosilicone rubber, also known as FVQM or MFQ, contains 23-28% fluorine and has nearly the same physical and mechanical properties as standard silicone rubber as matches on par with their flexibility at low temperatures.  However, due to its fluorine...

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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