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Sealing Gaskets

To Protect Electronics From External Dangers

LED Safe

Sealing Electronic Enclosures

Sealing Gaskets are used to fill space between two or more mating surfaces, commonly found in electronic, engineering and lighting assemblies. By using sealing gaskets you can protect electronics and create a seamless connection between surfaces.

Here at Materials Direct, we offer a range of Sealing gaskets and custom-cut materials to our clients to fit any size, shape or specification.

Latest Sealing Gaskets

Custom Cut Materials

Materials Direct is approaching this market in a way that is easy to order and specify in Electronics across all industries. Customers who need a certain brand of material which may not appear on the site can apply for us to add this stock to the sites portfolio based on potential usage.

tooling cost

No Tooling Charge
There is NEVER a tooling charge for manufacturing

fast manufacture

Fast Manufacturing
Parts made & shipped worldwide in as little as 24 hours


Technical Support
Technical expertise available from our specialists


100% Payment Secure
We ensure secure payment with a wide array of options

Instant Quotes – Purchasing Made Easy

The main problem for design engineers and purchasing has been until now the quick supply of parts as often the custom pad is one of the last items to be specified in the design of an Electronic assembly.

Materials Direct not only provides an instant quote but gives the buyer the offer of uploading their custom design for it to be manufactured within 24hours if the material is in stock.


step 1 quote
Get an online quote
for the part / gasket


step 2 approve
Upload your design
and approve


step 3 pay
Place and pay
for your order


step 4 deliver
Parts dispatched to you
in as little as 24 hours.

Sealing LED Assemblies

Sealing Gaskets and LED Sealing Materials are often used for sealing electronic enclosures and protecting LED assemblies from the environment. Care must be taken in LED assemblies as volatile condensables present in some materials can attack the delicate coatings in the LED itself.

This can lead to the LED changing colour and light output rendering the unit unserviceable. LED Sealing materials can be used to prevent this. Sealing electronic enclosures ensures that moisture, dust, and other harmful environmental components can not reach your LEDs.

At Materials Direct, all of our LED sealing materials are LED application safe

Elastomeric Sealing Gaskets

Films and Sheets

A Gasket is usually an elastomer film or sheet that is used in an interface between two surfaces.

An elastomeric gasket is a component that is softer than the sealing surfaces being mated together and deforms under pressure creating a seal between the two surfaces.

They are ideal for filling deformities and micro-voids connecting the two surfaces and can often seal gases such as air or liquids such as water.

At Material Direct we offer a range of Elastomeric films and sheets with properties such as being Electrically conductive, Thermally conductive, Radiation Resistant, and more.

Protecting Your Electronic Assemblies

Environmental factors such as dust, moisture, and temperature should be considered when building your electronic assemblies, and steps should be taken to protect your electronics. Without adequate protection, your design may lack performance or ultimately fail.

By using sealing materials to protect your electronics, you can ensure that your electronics are offered the best protection against outside environmental influences such as chemical and moisture ingress often fatal for your assemblies.

Material Specifications

At Materials Direct, we offer a wide range of sealing gaskets and materials including solid silicone, closed-cell foams, sheets, and films. Therefore whatever the application, we may have the materials to suit. If you require something we currently do not offer please let us know and we can stock it for you.


Sound Dampening

Dampens and Protects Against Sound Waves
003 moisturizing

Moisture Resistant

Protect Your Electronic Assemblies From Moisture & Liquids
led icon

LED Safety

Protecting Your LED Lighting Designs
no dust

Dust Protection

Protect and Seal Against Dust Particles
002 test

Chemical Resistant

Protect Your Electronics From Chemicals
manometer icon in orange

High / Low Pressure

Protection Against High and Low Pressures
vibration dampening

Vibration Dampening

Dampens and Protects Against Vibrations
001 high temperature

High / Low Temperature

Protects and Seals Against Both High and Low Temperatures


Keep Your Assembly Hygenic and Seal Against Bacteria

Quality Assured

We Provide Sealing Gaskets & Materials from Trusted Brands

Sealing Gaskets can be made from a wide range of materials including rubber, foams, and even metal. At Materials Direct we only sell top quality products and source sealing materials from a range of trusted suppliers and Brands.

  • Engineer, Rolls Royce
    'Having the ability to be supplied with precision cut materials for prototypes within 2 days has been excellent!’
    Engineer, Rolls Royce
  • Buyer, Eaton Aerospace
    'We have the need for small to medium batch sizes of various technical materials and Materials Direct have been highly responsive to our urgent needs'
    Buyer, Eaton Aerospace
  • Design Engineer, Philips
    ‘We have had to change our designs in the development stages three times. Materials Direct did not charge for these changes as the sizes stayed the same. Excellent!’
    Design Engineer, Philips
  • Quality Manager, GEC
    ‘Precision and high quality of parts received have been consistently to a high standard.’
    Quality Manager, GEC
  • Buyer, Selectronic
    'Buying online with Materials Direct has proven to be more efficient in time and deliveries, especially when scheduling future orders.’
    Buyer, Selectronic
  • Marien Chevennement
    'Very fast reply, very good order following and delivery in 24H. to recap a very good experience with Materials Direct for a very urgent need. I recommend a lot.'
    Marien Chevennement
    Schneider Electric

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Frequently Asked Questions

What are sealing gaskets?

A sealing gasket is a soft material designed to be distorted when applied between hard surfaces which need to be coupled together without leaking gases or liquids. The gasket needs to be mechanically held together to form a compression of the gasket. The selection of the correct material determines its suitability to perform in demanding applications such as:

  • High-pressure gases or liquids
  • Contact with certain chemicals
  • Electrolytic reactions between the clamped surfaces
  • Submerged applications
  • Electric Vehicle coolant applications
  • Exposure to vibration
  • High / low-temperature applications

What is the best sealing gasket?

There of course is no one material to solve all applications and you must assure yourself fitness for purpose based on the properties of the materials offered.

Which sealing gaskets are best for LEDs?

Materials Direct offer LED friendly gasket and pad materials which do not give off condensable chemicals which can be deposited on the LED itself. Many materials can do this and if it happens the phosphors can be destroyed or altered which drastically affect the light output and colour output. This mostly applied to hermetically sealed LED applications such as Roadside lighting, street lighting, Military, medical aerospace underwater applications. Basically anywhere that the LED unit is completely sealed the gases from the materials used build up with heat and become airborne which then with cooling condenses onto the surfaces within the unit. At Materials Direct we offer LED safe products especially to avoid these phenomena.

What materials are used for sealing gaskets?

There are many types of Gasket materials from solid Silicones good for high-temperature stability to phenolic materials designed to work with aggressive chemicals. If you do not see the material you would like in particular to solve problems in your particular application please inform us and we can stock your requirements

What are the different kinds of sealing gaskets?

There are very many different kinds of sealing gaskets and many requirements to seal. Materials Direct offer some of the more common materials but we are open to stocking more if you have an ongoing requirement.

Supplying Technical Materials

To a Range of Sectors

Each sector has its own unique requirements and specifications. Materials Direct works to ensure that each sector we supply to, receives the highest quality and best-performing products in relation to their industry and specific need.



The Aerospace industry demands the highest performing, most reliable technical materials to protect their electronic assemblies.


Automotive / EV

Automotive applications range from Engine management systems to motor drive controllers and custom-made gaskets and pads.



Industrial electronics are robust, have long lifetimes, are cost-sensitive, and suitable for use within difficult environments.

LED Lighting

LED Lighting

Sufficient thermal management in LED lighting can preserve longevity, increase reliability and optimise performance.



Materials used in military applications need to be of the highest quality and performance, often very rugged to very exacting standards.



Coupling discreet heat-generating semiconductors to heatsinks remains commonplace in power supply assemblies.

Any Questions?