NEW

How choosing the correct gasket reduces risks

Health and Safety across any industry are vital, especially so in industrial facilities and settings.  Why?  Because harmful leaks and emissions must be avoided at all costs to avoid serious accidents or injury to your teams and property.  That’s why having the right...

How to tighten your bolts perfectly

How to tighten your bolts and which tools you should use to achieve the perfect seal is not as seamless and straightforward as we would like. Various factors come into play in these situations, such as bolt grade, size, and even application type.  Tightening torques...

Static and Dynamic o rings

A range of factors and application dynamics come into play when choosing a particular type of o ring.  You need to understand the type of seal exert you require, the dimensions, and even compounds.  Due to the nature of an o ring and its overall design, o rings use...

Gasket Sealants

Fortunately, no one gasket suits a range of applications, but rather we have a multitude of gasket sealants available to meet various specifications and requirements.  Ultimately, sealants are used to effectively ensure gasket seals.  Helping to extend a gasket's life...

Types of industrial gasket material

Different industry sectors will use different types of gaskets and different types of gasket materials.   And of course!  Different industrial gasket materials will be much better suited to some industrial processes and applications compared to others.  As different...

Keeping a close eye on the gaskets your applications use

Gaskets are vital elements to any piping system and application that requires creating the perfect seal in order to prevent leaks.  This is the main role of a gasket, to provide a good seal, with some gasket materials sealing better than others in certain...

O Ring Colour Identification

O rings come in various colours, and it's important to understand what these colours indicate as the o rings you choose will affect your overall process application.  Ultimately, different o ring colours are used to help differentiate between different materials. ...

Spiral Wound Gasket Compressibility and Pressure Ratings

In order to form a reliable seal, spiral wound gaskets do require a certain degree of pressure.   The applied pressure allows the gasket to be compressed tightly between the mating surfaces preventing any leaks from occurring.  Factors such as operating temperature...

Elastomeric Compounds

What is elastomer?  Elastomeric compounds are rubber seals produced using natural rubbers or manufactured by the chemicals industry.  Elastomeric sealing compounds consist of between 50-60% rubber; the remainder of the compound consists of fillers,...

Is there such a thing as the right flange gasket?

We cannot stress enough how important gaskets and seals can be. Gaskets are vital for an application's reliability and integrity, and trust us when we say, choosing the right gasket now can help you avoid costly issues in the future.  Taking a closer look at pipe...

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

Your Details

Let us know how to get back to you.


How can we help?

Feel free to ask a question or simply leave a message.