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...

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Is fluorosilicone rubber o rings a sustainable choice?

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 content, fluorosilicone rubber does offer better resistance to oils and fuels, and it also provides a good level of resistance to swelling. 

When it comes to fluorosilicone rubber temperature range, it’s important to note that the operating temperature range in fluorosilicone is reduced slightly, but only slightly, and we will come on to this further in this blog post. 

As the leading o ring supplier in Leeds, if you have any questions relating to o rings, seals and gaskets, speak to a member of our professional team today – call 01535 274 776.

Benefits of fluorosilicone rubber 

Often opted for when the working environment is considered “harsh,” you will find fluorosilicone rubber o rings used in more and more applications due to the numerous benefits this material can provide.  For example, you will find this type of o ring found in automotive, fuel emissions, petroleum oil applications, solvent environments, environments with broad temperature ranges, and more. 

Fluorosilicone rubber properties: 

  • It has a temperature range from -60 degrees Celsius to 205 degrees Celsius. 
  • Have a hardness range from 40 to 80 Shore A. 
  • Can maintain its tensile strength. 
  • Remain flexible at all times. 
  • Have excellent compression set resistance.

Fluorosilicone material properties are: 

  • Resistant to oils, fuels, chemicals, and solvents (great for static seals). 
  • Resistant to extreme temperature ranges (making them great in fuel systems where temperatures can reach 220 degrees Celsius) 
  • Flexible at low temperatures 
  • Resistant to weather and high ozone levels 
  • Resilient to rebounding 
  • Resistant to petroleum oils and hydrocarbon fuels 
  • Resistant to water, ageing, and bacteria 
  • It can be compression moulded, injected, extruded, and calendared into o rings, gaskets, tubing, and other seals. 

Fluorosilicone rubber also has good mechanical and dielectric properties, helping engineers who opt to use these elastomers deliver a more suitable, sustainable, and innovative solution to sealing requirements. 

Due to its resistance to solvents, this material is ideal for specific applications where you require a general resistance to a range of chemicals and solvents.   

Fluorosilicone rubber also continues to perform even when placed under extreme temperature ranges, with FFKM o rings offering you higher thermal and chemical resistance than standard o rings – great when working with chemical applications. 

We also must emphasise the resilience again that fluorosilicone rubber properties provide.  

Offering a low compression set, this elastomer will not deform under strain and compression, keeping the seal intact and hence reducing the risk of leaks.  Providing you with reliability and durability across a range of applications, even those that prove to be the most challenging. 

Primarily, you will find this type of material in the automotive and aerospace sectors, with medical and pharmaceutical sectors now following their lead as they are also beginning to see the benefits this material provides, especially when it comes to its resistance to bacterial growth! 

Due to the nature and composite of its properties, fluorosilicone rubber is suitable for: 

  • Medical tubing 
  • Seals and engine gaskets 
  • Air pump valves 
  • O rings 
  • Full line seals 
  • Leak detection seals 
  • And much more. 

Cons of fluorosilicone rubber 

Fluorosilicone has low tensile strength and high gas permeability.  It also suffers from low tear strength and poor abrasion resistance. 

These elements combined mean fluorosilicone is often not suitable for dynamic sealing. 

They can also be expensive compared to standard silicone.  This is because the makeup of fluorosilicone is difficult and time-consuming when we examine the vulcanisation process in more detail; this drives up production costs and overall expense
For all fluorosilicone rubber has a high chemical resistance, it’s important to be aware that it is not resistant to everything.  For example, fluorosilicone rubber will not perform well with brake fluids, ketones, hydrazine, and amines. 

Further information 

It’s important that you get the right compound to fit your requirements and specifications perfectly.  

The right seal can ensure that your application suffers from no leaks or gases escaping.   

Due to this material’s various benefits, fluorosilicone is an attractive option when matched with the correct application. 

If you need help choosing the right o ring and seal for your application, call the specialist o ring supplier Leeds on 01535 274 776 today or email us at for further information.

Must read: O rings for the Beer Industry



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