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Types of Flanges

Businesses in a variety of industries rely on flanges to join pipes or components together or to keep equipment secured to a surface. When it comes to choosing the best types of flange for your processes, you’ll want to take the time to research the different options...

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...

See our latest catalogue for all the services we offer.

High-temperatures and O Rings, what you need to know

o rings and high temperatureFluctuations in temperature and indeed heat is a significant factor across many applications that make use of o rings. 

However, what is well known is how destructive heat can be when it comes to compound deterioration. 

You are making choosing the ideal o ring suitable to withstand those high temperatures, essential. 

Because of this, there are several factors that need to be taken into consideration. 

In this post, we take a look at some of the most popular materials suitable for those high-temperature and chemical applications, what they are best used for and what applications they should avoid. 

Most commonly found o ring materials and their suitability to specific applications 

Viton, or FKM, is primarily used for automotive oils, fuels, and gases, due to its high level of resistance to these substances at extreme temperatures. 

Viton ultimately does not allow liquids such as mineral oils, hydraulic fluids (non-flammable), grease and silicone oil to pass through the seals.  Plus, it is extremely compatible with several hydrocarbons. 

However, and important to note, we would not recommend the use of Viton material seals with liquids such as brake fluid, ammonia solvents, super-heated steam, and strong acids. 

The material ACM, on the other hand, can resist gearbox oils, and transmission fluid. And the difference between ACM and FKM is that ACM can work at a lower temperature in comparison to Viton (150 degrees for 200 degrees, comparatively). 

Nitrile or HNBR is the most recommended sealing product material for sealing that needs a strong abrasion compound. Ideal for oils, fuels, gases, hydraulic fluids, and more. 

Please note: Nitrile does have limited resistance to brake fluids, and we don’t recommend this as a suitable material to withstand chlorinated hydrocarbons, strong acids, and polar solvents. 

A material that can withstand temperatures of 232 degrees and is used in a range of automotive sealing is that of AFLAS. For all compression is affected here, this material is still more than suitable with all makes of automotive brake fluids, engine coolants, motor oils, gear lubricants, power steering fluids, and more. 

However, AFLAS will not suitable for ketones, aromatic fluids, or chlorinated hydrocarbons. 

Silicone or VMQ is a widely used o ring material due to its resistance to high temperatures. It is mainly used for products that are highly exposed to ozone, Ultra Violets, and weathering. Silicone is not, however, suitable for hot water, chemical, or dynamic applications. 

Those universal compounds that offer both temperature and chemical resistance are both FFKM, perfluoro elastomers, and Teflon, PTFE.  PTFE is a tough, robust, and inflexible Thermoplast, while FFKM is classified as a thermoset elastomer. 

Unfortunately, PTFE material o rings are easily dented due to their hard material, so hence do suffer from high compression sets. 

However, following in the footsteps of PTFE o rings is that of FEP o rings. A seal that has a chemical and heat resistance similar to a PTFE seal. However, an FEP is much more flexible. A practical and effective solution for static applications such as pumps. 

FFKM is available through a variety of brands and can be provided in a variety of different material grades to suit a variety of different applications.

Find Out More Here!

However, the price can be everything 

Cost plays a vital role in the selection of an o ring, as well as the factors based on the materials we’ve outlined above. 

It’s important to be aware that there is a price difference between the different compounds of o rings, as well as sizes and grades. 

Being aware of this and the different materials available and what they are most suitable for will help you make the most informed decision, suitable for your application. 

Specialist Sealing Products are one of the leading suppliers of o rings throughout the UK. Based in Leeds, we work with many businesses, with a number of applications, all looking for the best sealing products around. 

To find out more, make sure to call us today on 01535 274 776. 

Read the next article: Optimal Squeeze for an O Ring to be effective 

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