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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.

Optimum squeezing force for an o ring

Optimum squeezing force for an o ringIt 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 reliant on the squeeze force applied, as a tight seal is what helps liquids and gases from escaping from the application. 

At specialistsealingproduct.co.uk, we stock a range of different gaskets, seals, and o rings to suit various applications in various industries. 

However, when it comes to squeezing and how much force you should apply, this is of course dependent on the mating surfaces and o ring material itself. In this post, we look at squeeze force further, factors affecting squeeze percentage, and why more squeeze is not always better. 

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Squeezing force applied to o rings 

Finding the optimum level of a squeeze for your o ring and application will come down to a series of tests and, in some instances, trial and error. 

Yes, the more squeeze that you apply, often the better and stronger the seal will become, and the longer it can maintain the force applied. In these instances, the ability of an elastomer to maintain its compression set is vital as, ultimately, it dictates the ability of the elastomer to maintain its push back. 

If we examine this a little further. If the elastomer has an o ring compression set of over 80%, it is unlikely that it will return to its original uncompressed state when it is not squeezed. Hence causing damage and allowing leaks to appear. 

Other influencing factors affecting o ring squeeze include: 

Damage upon installation – the installation of an o ring can be a delicate process. In some cases, during the installation process, the tighter the squeezing force you apply, the more likely you are to pinch the o ring, creating an opening for leaks. 

O ring material – o ring material choice is vital because specific elastomers and compounds will only stretch so far before they crack or rupture because they have been squeezed past their optimum percentage levels. It’s also important to note that rubber seals do not compress volumetrically, so you must avoid over-compression if this is your o ring material of choice. 

Gland volume to o ring volume must be measured – this area focuses on not overpacking the gland. During the installation process, you need to make sure that there is enough groove volume to accept the o ring.  Allowing the o ring to fit into the groove and expand as required. Too much o ring volume and not enough groove volume will overpack the gland causing damage and seal failure.  Ideally, the o ring must fit snugly into the gland, and the o ring volume should never exceed 90% of the minimum gland void as this will cause premature failure of the seal. 

Achieving the perfect o ring compression and function is vital. In some cases, engineers work on testing the leak path ratio between the o ring and its mating surfaces to avoid potentially premature failure. 

Sometimes it does not matter how much squeeze you apply to o ring seals. Factors such as gas permeation, the seal’s interaction with certain chemicals, mechanical damage, thermal degradation, etc., will all cause the o ring seal to perform poorly, no matter what. 

This is why testing optimum squeeze levels and choosing the right materials and compounds can be vital. Every application is different; hence every o ring compression set will be different. 

Finding out the right percentage level for your seal and mating surfaces before mass-scale production takes place, is, therefore, essential. 

There are numerous factors when considering the squeezing force of an o ring. Specialist o ring suppliers in the UK, like the team at Specialist Sealing Products, will be able to provide you with further sealant advice and information, as well as refer you to manufacturing instructions if applicable. 

If you are looking for the perfect o ring seal, look no further than SSP for all your gasket and sealing requirements. 

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Reference video: tarkka

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