NEW

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.

Importance of durometer testing

Importance of durometer testingDurometer or shore durometer is a way for industry professionals to measure how hard such things as plastic, rubber, and non-metallic materials genuinely are. 

Its focus is to measure on a Shore A or Shore D scale, looking at how robust material is when examining its resistance to surface penetration. 

You will often find that those that are identified as hard materials are more resistant to wear, yet less flexible in their movement.  Hence, choosing the right o ring durometer for your application is essential to ensure the overall product’s wear and lifespan. 

Durometer tester 

Ashore durometer is the actual measuring device. 

Measured on a scale from 0 – 100, the durometer is a dimensionless measurement as its numbers simply represent a comparison between different, yet very similar materials. 

The higher the durometer measurement, the harder the elastomer. 

A durometer scale can run from: 

Very soft urethanes – suitable when applying coatings, and typically found in the range of 10A-50A. 

Soft urethanes – suitable for particle impingement applications, with ranges between 50A and 85A. 

We then move on to the mid-range, where urethanes here provide medium resilience and offer longevity to a material.  Typical ranges on the durometer scale include 80A to 95A. 

Hard urethanes are great for impact and various abrasion applications, with ranges varying from 90A to 95A. 

The last on the scale is the very hard urethanes, suitable for bearing and brushing applications, with scales running from 60D to 75D. 

The shore durometer standards provide a universal, consistent, and easy reference to allow anyone to compare material hardness effectively and efficiently. 

Two different types of Shore 

Most rubber materials will be presented as either Shore A or Shore D, and these are two different durometer scales. 

Shore A is a scale suitable for softer materials, covering flexible rubbers and semi-rigid plastics. 

Shore D, therefore, you might have guessed it, is for harder materials, those hard rubbers, and plastics. 

There is a third Shore, Shore OO, which measures extremely soft rubbers and gels.  However, this type of durometer testing is not always suitable for flow control components. 

Choice of materials 

When we talk about hardness, we refer to a material’s ability to resist penetration or permanent indentation. 

Therefore, it’s essential to know how hard a material is before choosing it for your given application. 

Ideally, you’re looking for the best material to create the best seal hence reducing the chances of a leak occurring. 

Another example of why durometer choice is vital is when processing heat seal packaging applications. 

Here harder durometer heat seal silicone rubbers will provide much better heat transfer properties than those with softer durometers. 

One of the best features of using the shore hardness scale is that it uses equipment and testing procedures suitable for selecting materials that you will be using. 

When it comes to o rings however, other measurements must be considered when identifying overall sealing performance. 

These include testing its strength, resistance to scratching, overall wear and tear, etc. 

For example, a rubber’s compression modulus measurements and stiffness can often be much more accurate than an o-ring durometer for indicating sealing performance; however, this is still a vital element and one which is used across various sectors. 

Find Out More Here!

O ring suppliers, UK 

Tested o rings are available from numerous suppliers throughout the UK, all with different durometer measurements. 

The most common are those o rings that sit with a durometer measurement of between 70 and 90. 

Back up rings will typically be 90. 

To put it into perspective, o rings measuring with a durometer of 70 tend to be the same hardness of a shoe heel.  This range is also the one that offers the best combination of properties suitable for most o ring applications. 

Of course, those with a softer compound are easy to stretch and seal, which often works better on rougher surfaces. 

Those harder compounds are more abrasion and extrusion resistant, which is ideal when high pressure is used.  These harder compounds are also greater for more dynamic applications. 

O ring suppliers, Leeds 

Specialist Sealing Products are the leading supplier of o rings and seals throughout Leeds, Yorkshire, and beyond. 

We offer a range of o-rings and sealing products suitable for various applications operating across different industry sectors. 

To find out more about o ring durometer and how we can help you, call 01535 274 776 

Read related post: What are Elastomeric Compounds

Reference video: BJBEnterprises

Previous

Next

Contact Us
close slider