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.

Keeping your o rings bonded

Keeping your o rings bondedEMI o rings. Those seal ring gaskets are made of silicone compounds, combining environmental sealing with electromagnetic interference protection. 

Consisting of metal or metal-coated particles, silicone o rings are filled with silver, silver aluminium, or nickel graphite. 

Experienced o ring suppliers UK will be able to advise you on the best type of o ring for your specific application, with EMI o rings, in particular, being highly effective for the automotive, aerospace, industrial, medical, and military sectors. 

O ring adhesive 

Manufactured from EMI elastomers and solid cords, bonded o rings are designed to provide EMI shielding and environmental sealing capabilities to a range of industries. 

The benefits of using EMI shielded o rings are that they provide reliable protection against electromagnetic interference, radio frequency interference, and environmental sealing and electrical conductivity. 

Cut by gasket manufacturers, silicone o ring cord ends are bonded together to form a tight seal. This bonding process is carried out via cold bonding or vulcanisation. 

Of course, like with anything, there are both pros and cons to each process which we will explore in a little more detail below. 

Cold bonding 

As the bonding name suggests, cold bonding doesn’t use any heat. Instead, a non-conductive adhesive is placed on the cord ends. Due to not using a compression moulding technique, customers wanting these o rings will experience shorter lead times, and due to the production volume of these rings, cold bonding also helps limit your cost per part. 

However, it is important to be aware and note that during the o ring splicing process, if the o ring is spliced incorrectly, the non-conductive adhesive will no longer be effective when the two ends are bonded together. 

Providing a reliable shielding for most applications, for you to get the maximum benefit from these o rings, they must be bonded together by experienced gasket fabricators to ensure speed and precision. 

Vulcanisation 

The vulcanisation process uses heat to join the cut lengths’ ends, using conductive adhesives, creating single, solid o rings from EMI cords or extrusions. 

Applied to the ends, the adhesives are then pressed together in a vulcanising press or hot mould. 

These o rings can also match the reliability of conductive shielding elastomers, i.e., vulcanised EMI o rings provide reliability and typically meet or exceed the strength of the material it is used alongside. 

Vulcanised o rings offer consistency and dependability and should be used in static, non-pressurised environments. 

However, compared to cold bonding, lead times are longer, and sometimes costs are slightly higher as this particular process requires compression moulding techniques. 

Ultimately you need to select the most appropriate o ring glue and joining method for your application. 

Binding agents 

We know that EMI o rings are more economical compared to moulded o rings, and they do not compromise performance. 

And when a vulcanised o ring uses an EMI bonding agent with the same characteristic as the extruded cord, then EMI penetration or leakage can be prevented. 

This is why EMI o rings should be bonded using silicone-based adhesives containing EMI filler as non-silicone glues without EMI filler can create a weaker seal which makes the application more susceptible to leaks. 

(Finding the right gasket seal for your application is vital. To support your decision-making you might also be interested in o ring shrinkage and the shrink rate calculation, which you can find more about in our latest post, O ring squeeze.”) 

It’s also important to note that acrylics and other non-silicone glues tend to dry much harder than EMI silicone cord. This means you will often find a `hard spot` in the finished gasket as the acrylic adhesives can’t match the temperature range of the EMI cord material, making them easily breakable. 

To prevent these issues and risks of leaks, the vulcanised o ring should use the same EMI bonding agent as the extruded cord, with the bond strength and elongation checked against standard o rings to ensure the highest of standards. 

At Specialist Sealing Products, we supply o ring stock to cut and bond using the various methods mentioned above. With a range of options available call us today on xxx to find out more and to see how we can help you. 

Previous

Next

Contact Us
close slider