O Ring Colour Identification

O Ring Colour Identification

O rings come in various colours, and it’s crucial to understand what these colours signify, as the o rings you select will impact your overall process application.

Contact us to discuss your requirements for colored silicone o rings. Our experienced sales team can help you identify the options that best suit your needs.

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

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

You can order our o rings directly online HERE; however, if you have specific queries regarding o rings, their color, and their materials, call us at 01535 274 776 or check this page to learn more 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 comply with the EN 681-1 standard and come with the SECURFRABO patented system security. These o rings can withstand minimum temperatures of -10 degrees and maximum temperatures exceeding 110 degrees.

Yellow O Rings

Manufactured using HNBR, yellow o rings are used in gas applications and comply with the EN 549 standard.

These standards are split, i.e., EN 681-1 yellow o ring for water and EN 549 yellow o rings suitable for gas. They feature the patented security system SECURFRABO. The minimum temperature for water and gas can reach -20 degrees, with a maximum temperature of +95 degrees. For gas-only applications, minimum temperatures reach -20 degrees, and their maximum temperature can reach +70 degrees.

Green O Rings

Manufactured using FKM materials, these o rings operate efficiently at high temperatures and fluctuating stress levels, making them ideal for systems such as solar. They can handle maximum temperatures of 160 degrees but can peak at 200 degrees for short periods if required.

O Ring Colour Coding

O Ring Colour/O Ring Material

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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 distinct properties, making them suitable for various applications and processes. It’s essential to choose the most appropriate material to provide the best seal for your application.

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

Colour coding o rings has allowed the industry to differentiate between various types of materials and, most importantly, improve their visibility in applications.

Sometimes coloured dots may be applied to o ring batches to help with your inventory management, keeping everything organised and systematic. (Note: These markings are not permanent and are meant for your reference only.)

SSP can assist 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 made from neoprene or Nitrile or, in some cases, a mix of the two materials. Black o rings were mainly the only coloured o rings available before 1987; however, as new materials entered the market, different colours were needed to identify the various materials, marking their visibility and allowing businesses to ensure their suitability for specific applications. Black o rings are most commonly used for auto air conditioning applications.

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

Simplifying the o ring colour selection process has been called for; however, currently, these colours provide a clear picture of the changes taking place.

Specialist Sealing Products offer a range of o rings and can assist with colour coding for inventory management. Our knowledgeable, experienced, and friendly team is available 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!

Color-Select O-Rings - Stock

Color-Select O-Rings, our industry standard color Identification O-Rings.

Buna-N (Nitrile) 70D, easy O-Ring size identification! Buna-N O-Rings are the most common and the simplest types of seal with excellent sealing properties and durability. They are recommended for use with crude oil, gasoline, propane, petroleum oils, and water. These o rings are used in engines, gearboxes, and can be found in items ranging from shower heads, garden hoses, pumps, to aircraft. Nitrile O-Rings are used as a face-to-face gasket-style seal or as a shaft seal, allowing both rotary and linear movement.

Operating temperature: -40° to +250°F

Size not listed, special requirements, or large quantities? Please click this link to Request a Price Quote.

The company is the world’s best black tc rubber oil seal price supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.