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Protecting your seals

Dust gets everywhere.  We see it across the surfaces of our homes and even in our workplaces, especially when the light shines through to show it in its full glory!  However, dust that seeps and builds up within engineering equipment can be disastrous.  Causing damage...

Importance of durometer testing

Durometer 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...

Metal Detectable O Rings

Metal detectable o rings became a necessary must when it was identified that some chemicals, exposure to extreme temperatures, and continuous vibrations could cause failings in standard o rings.  Failings that not only mean a breaking of the seal, but there is also an...

Tips for best o ring maintenance

If o rings are not maintained, leaks can occur, and water and other fluids can enter the appliance or application, and even product in the mix!  If this happens, damage can occur to internal parts and mechanisms, causing deployment failings, potential false readings,...

What you need to know about O Ring Lubricants

Silicone grease and lubricants aren’t just a nice to have for o rings, but they can quite often be a must-have.  However, with so many greases and lubricants to choose from, it can often be a minefield choosing the best ones and the right ones for your o ring and...

O Ring Replacement

Replacing an O Ring in pressure washer wands is probably one of the most common replacements you'll find when working with seals.  Unfortunately, O Rings don't last forever, and over time they do deteriorate, and you will require an O Ring replacement.  It's important...

Reasons behind seal failure and a look into seal replacement

Unfortunately, there are occasions where O-rings, in particular, fail.  The failure of these seals is not simply due to one factor, but various factors that can occur across a range of applications – hence why locating the exact cause of such problems is just that, a...

Gaskets and seals for Aerospace

Gaskets and seals used for aerospace applications and equipment must be of premium quality and to a substantially high standard.  They are used across a range of applications such as radars, antennas, lighting, access panels, electrical conductivity, pressure sealing,...

Finding the best sealing materials for Food Grade Applications

You will find rubber seals across various industries, providing an important element and operating as a vital fixing across a wide range of different applications and equipment.  However, these FDA gaskets must follow strict, set guidelines, in terms of their material...

The Evolution of Gasket Solutions

When we talk about gaskets and the history of a gasket, we must start at the very beginning.  What is a gasket?  Ultimately, a gasket is a manufactured seal that is used to fill the gap/space between two or more surfaces.  Gaskets are typically manufactured by cutting...

O-ring Size Guidelines

O-ring Size GuidelinesThe performance of an O-ring seal depends largely on two factors the right material and the right size. However, determining the right size O-ring is usually the hardest part when it comes to choosing the right O-ring for an application.  

Unfortunately, selecting the right O-ring size is paramount to avoid leakage and other costly damages that may occur in the long run.  Additionally, If you’re unsure what O-ring size you need, you’ll have a difficult time purchasing an O-ring that will work for your application.  

So, here’s a guide that will help you size an O-ring properly.  

Measuring O-ring Cross Section and Inside Diameter 

To identify the right O ring sizes for your application, you need to know the required cross-sectional (CS) diameter and the inside diameter (ID). The CS can be best measured using a calliper, but you can also get a close estimate using any other sizing tool.  

When it comes to measuring the ID, it is advisable to use a calliper for very small IDs and a Pi-Tape or O-Sizer for larger IDs. Once you’ve determined the CS and ID, you can use an O-ring size chart to determine if the dimensions correspond with the recommended O-ring size for your application. 

Understanding O-ring Sizes and Tolerances 

O-rings are normally described by either standard (inch) or metric (mm) dimensions. There normally exists some variance in the O-ring dimensions as a result of manufacturing limitations. These variances are referred to as tolerances.  

Aerospace Standard AS568B defines standard O-ring sizes. The CS of these O-rings range from 0.040 to 0.275 inches, and their ID range from 0.029 to 25.940 inches.  

Metric O-ring sizes, on the other hand, are defined by International Standard ISO 3601-1, which classifies metric sizes into two categories, G and A. The G series O-rings are available in a wide range of ID and are ideal for general purpose applications. The A series O-rings, on the other hand, are ideal for aerospace applications, which require tighter tolerances.  

Choosing the Right Cross-sectional Diameter 

Generally, O-rings with a larger CS offer better resistance to compression set. Moreover, they have less volume swell in fluids and won’t leak easily if their surface is scratched.  

Orings with smaller CS boast superior physical properties. They also can resist explosive decompression better than their larger CS counterparts. Moreover, these O-rings are more space-efficient. 

When it comes to dynamic applications, you would want to go for O-rings with large CS as they are more resistant to rolling in a groove. Smaller CS O-rings will normally slide and roll in a groove, resulting in leakages due to the ring’s spiral failure.  

Now that you have some knowledge of O-ring size selection, you can go shopping for your O-rings at Specialist Sealing Products, one of the leading O-ring suppliers in the UK. The company offers a wide range of high-quality O-rings. For more information on O-rings and other sealing products offered by Special Sealing Products, click here 

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