Silicone Gaskets and Seals

Order the perfect silicone gasket and seal types for your business, quickly and easily today. We have plenty of standardised gasket and washer sizes in stock ready to ship. We also manufacture bespoke custom made gasket parts, cut to meet whatever your requirements.

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Overview: An introduction to silicone seals and gaskets

A silicone gasket is a mechanical seal that is capable of operating under extreme conditions and environments. Silicone rubber gaskets form tight seals between two parts on components to prevent any leakages. Silicone gaskets have a diverse range of applications and are used all over the industrial world.

We can supply and make whatever silicone rubber gasket type you need

Because silicone gaskets are used for lots of different components, they come in many different shapes and sizes. That’s why we stock and supply a large range of standardised gasket and washer sizes ready to ship. 

We can also make bespoke custom rubber gaskets and silicone rubber seals to meet your specific requirements. Our custom made gasket orders can be produced to fulfil one off or high-volume requirements. 

We make custom silicone gaskets up to 3000mm x 1500mm x 20mm thick (with a 50mm maximum thickness for silicone sponge).

If you have a CAD file, we can use that to make your custom made gaskets. We are able to accept CAD files in a variety of formats including .dwg, .dxf, . step, .iges

More information on our rubber gasket manufacturing service

We also supply flame retardant gaskets made from silicone rubber compounds formulated to meet rail specifications EN45545-2 and aerospace FAR/JAR 25.853 requirements. Our gasket materials include:

  • FDA approved
  • WRAS approved
  • Conductive 
  • Platinum cured 
  • Metal detectable 
  • High temperature
  • Medical grade 
  • Flame retardant

For more information regarding our material options visit our materials page.

Silicone gasket applications

One of the reasons silicone rubber is so useful is because it is a synthetic elastomer with outstanding thermal stability. Meaning it can maintain its flexibility and compression set at both high and low temperatures. Silicone rubber also has excellent non-stick and electrical insulation properties. Making it suitable for a wide range of gasket applications.

Silicone rubber seals are also frequently used in outdoor environments due to the material’s resistance to weathering, ozone, UV and oxidation. Because silicone is naturally an inert material, it does not react with many chemicals. Making it highly suitable for a large number of medical and industrial applications.

How are silicone rubber gaskets manufactured?

Die cutting involves creating a bladed tool in the shape of the desired gasket. The tool is set either above or below the gasket material. A hydraulic press is then used to cut out the gasket. Die cutting has several advantages including:

  • Low tooling cost
  • Fast set up time
  • Reusable tooling
  • Consistent cutting tolerance
  • Suitable for small and large production runs

Flash cutting is a great way to quickly create custom gaskets. During the flash cutting process, a dieless oscillating knife is used to cut through material of varying depth. Cutting equipment is integrated with computer aided design (CAD) systems.  The CNC cutting machine uses code generated from the CAD file to control the movement of the knife, to accurately produce the desired shape. 

Advantages of CNC flash cut gaskets include:

  • No tooling costs
  • Fast lead times
  • Multiple designs can be cut on a single sheet
  • Highly complex shapes & designs, from large rubber gaskets, extruded silicone gaskets and more
  • Consistency across gaskets
  • Human error removed

Lathe cutting involves placing a silicone rubber tube onto a mandrel. The mandrel is then rotated at high speed on a lathe machine. Benefits include:

  • Fast lead times
  • Tight tolerances
  • Minimal material waste
  • Suitable for large OD & Small ID gaskets
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Silcione Gasket FAQs

How long do rubber gaskets last?

About 20 years. That’s for silicone rubber gaskets, anyway. Silicone gaskets can last up to four times longer than other, non-silicone rubber materials. A typical gasket (non-silicone) has a shelf life of around 3 — 10 years.

What are rubber gaskets used for?

Gaskets are the unsung heroes of the modern world. They are vital to thousands of machines, appliances, and components. Gaskets can form barriers between two metals or chemicals. They seal refrigerator doors. They are used to prevent gas and liquid leakages. Because rubber is so versatile, it is used all over the world, across industries. It has many different purposes and comes in many different shapes and sizes, for an almost unlimited number of applications.

What's the difference between a gasket and a seal?

Gaskets and seals are made from the same materials and in the same way. It is how they are applied that makes the difference. For example, gaskets seal a connection between two components with flat surfaces that don’t move much. Silicone seals however, are used between things that move a lot (rotate): such as between moving engine parts, pumps, and so on.

Is an O ring a gasket?

Yes and no. Both O-rings and gaskets exist to fulfil the same purpose, but some engineers will argue that O-rings are distinct enough to be classed apart from ordinary gaskets. O-rings are circular in shape (hence the name) and are often used to create a seal to contain or separate fluids and different environments. They are manufactured to sit in a groove and compressed between two or more moving parts.

If you need a silicone rubber gasket manufacturer or to order quality silicone gaskets, please get in touch

One of our experts will be happy to answer any questions you have and to discuss your requirements.

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