What are bonded seals?

A type of metal washer used to provide a seal around a screw or bolt

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This design came about in order to solve seal problems that copper washers presented in high-pressure applications where they ended up bursting. The bonded seal was then invented, a static seal formed by an elastomeric lip seal/ring to which a metal washer was added.

What are the advantages of a bonded seal?

Bonded seals are produced by vulcanising the rubber ring to a zinc plated steel washer with heat and pressure. A simple process that brings many advantages to the finished product:

• Good seal for both low and high pressure.

• Able to withstand both high and low temperatures.

• Cost effective and very versatile solution for threaded bolts.

• Wide range of elastomers and metals available.

• Metal washer prevents over-compression, limits the elastomeric ring from deforming and can be used for overhead installations.

• Its design prevents excess compression and extrusion.

• Easy installation, seals flat surfaces that holds the lip seal in place.

• The self-centring bonded washers also prevent the possibility of leakage and ensure correct centring during installation.

Types of metal washers

The metal part of bonded seals can be made of different metals (copper, aluminium, steel...), but we only sell steel ones at JIOrings.

Zinc-plated carbon steel: Carbon steel (also known as mild steel) is a common machine steel with a low carbon content that is neither extremely brittle nor ductile. With the zinc plating process, a layer of zinc is bonded to the steel to protect it from corrosion when it is exposed to air and moisture.

Stainless steel: These ferrous alloys are highly corrosion-resistant alloys that contain chromium and/or nickel.

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Types of elastomeric lip seals/rings

Elastomeric part of bonded seals can be made of different materials (NBR, FPM, HNBR, copolymers...). The choice will depend on its intended use. In our case, most of our bonded seals are made of NBR lip seal, although we also have some in FPM.

NBR: Acrylonitrile-butadiene rubber (NBR) is the most widely used material due to its good mechanical properties, high abrasion resistance, low gas permeability and high resistance to oils and mineral oil based-greases.

Size chart

Check the size chart at https://jiorings.com/metal-buna-medidas/

As you start to compare the seals on offer on our site, you’ll find that there are many different options for a variety of uses. Bonded seals are a great solution for some applications, offering many benefits over other types of seals. Specialist Sealing Products offer a range of seals and other products for businesses of all types. Our team will be here to support you in finding the right option for your needs this year. For now, keep reading to discover what are bonded seals and whether they are the right option for your unique needs.

What is a Bonded Seal?

A bonded seal is a metal washer that can be used to offer you a seal around your bolt or screw. This design helps to solve issues with high-pressure applications where there is a higher potential for the seal to burst. The bonded seal is created with an elastomeric seal or ring that’s added to the metal washer to create a tight fit. There are many advantages of this type of seal, which we’ll explore now to help you to decide if this is a good option for your business needs.

The Advantages of Bonded Seals

Bonded seals offer many benefits to business owners. The main thing to consider is that they can be used at high and low-pressure settings and also at high and low temperatures. This means they are very versatile and can be a cost-effective option for your business. When you select your bonded seals, you’ll find there are many different metals and elastomers on offer to choose from. We’ll be able to recommend the best option for your needs, with all of the designs on offer helping to prevent compression and extrusion issues.

A bonded seal will be very easy to apply and will seal flat to keep the lip seal in the correct position when it is in use. You’ll find that it centres itself to prevent leaking and keep the right placement while it is installed and then used. The metal washer will help to avoid over-compression and stop the ring from becoming deformed. You’ll find that when they are used correctly, you can reuse bonded seals over and over again, helping with all of your sealing needs.

What are Dowty Seals?

When you look at bonded seals online, you might also find they are called Dowty seals. These products are exactly the same, just with a different name. You can use these high-pressure seals for a variety of needs. They are commonly used within the pneumatic, hydraulic, and mechanical industries, helping to provide a much-needed seal when working with high-pressure and high-temperature settings.

What Materials Are Bonded Seals Made From?

The great thing about bonded seals is that they can be made from a variety of materials, including mild steel, nitrile, and stainless steel. On top of that, you’ll find FKM, brass, EPDM, aluminium, and silicone options. All of these seals will offer the same benefits that we shared above, helping to offer you the seal you need for various applications. We recommend working with our team to choose the right material option for your business, but all of these options are great solutions when choosing sealing products.

Self-Centring Seals

As well as the type of material the seal is made from, we recommend looking at self-centring seals where possible. These make the seals so much easier to install and will ensure there is no seal offset. This can undo the good work of using this product, which is why self-centring options are so much easier to use. You’ll find these seals on offer in imperial and metric sizes and with different metals and sealing materials.

Do You Need to Use Bonded Seals?

While you could get away with not using bonded seals, they are a fantastic product for a variety of applications. If you are concerned about leakages, you’ll find these help to overcome this issue. They are quick and easy to install, which is why we recommend anyone invest in them. With so many different materials on offer as well, you’ll have no trouble finding an option to fit your business needs.

Are you looking to purchase bonded seals for your business? If so, take a look through our full range of products on our site. We offer a wide range of seals for every business need and will be happy to answer your questions about any of the products on our site. Our experienced team knows the best material options for a variety of applications and will be excited to support you in choosing the right bonded seals. Contact us today with any questions you have on the topic, which our team will be more than happy to help answer and discuss with you.

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