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Intumescent Seals


The importance of restricting the spread of fire and smoke within a building has long been recognised. In most buildings there will be a specific exit route in the case of a fire, in order to keep this passage protected in the event of a fire certain doors have to meet with strict fire testing standards. Fire doors will have been tested to hold their integrity in fire conditions of either 30 or 60 minutes. However in many cases some modern doors only meet these requirements with the additional use of an Intumescent fire seal. Considerations regarding the door’s ironmongery also have to be taken into account with regards to the integrity of a door in a fire.

Intumescent Fire Seal

Intumescent Fire Seal

The purpose and role of the Intumescent fire strip is to seal against the passage of fire, smoke and hot gases. The seal is often made from a graphite based substance which when heated to greater than 150 degrees centigrade will activate and swell to many times its original size, thus sealing the gap between the door and frame. This will then reduce the speed of the spread of fire to the rest of the building.

Intumescent Fire & Smoke Seal

Intumescent Fire & Smoke Seal

The spread of smoke and hot gases can also be a big problem, in fact smoke can be a major cause of death and injury along with being a significant contributor  to the cost of the fire damage. It is therefore imperative that smoke and hot gases are contained in the event of a fire wherever possible. The containment of smoke can be achieved with fire seals which incorporate a brush smoke seal, which, along with preventing the spread of fire also help aid against the spread of smoke and hot gases.

We sell both fire only intumescent strips and fire and smoke intumescent strips suitable for both 30 minute and 60 minute fire door assemblies. They are available in 3 different sizes, 10 and 15mm strips are suitable for most 30 minute fire doors, 20mm are suitable for 60 minute fire doors. They come in either white or brown to suit different door finishes and are quick and easy to install with a self adhesive backing. Furthermore all of the intumescent seals we offer comply to BS476: Part 22: 1987 and BS476: Part 31.1 and are Certifire approved. They are also competitively priced too!

If you have any questions or queries regarding intumescent fire and smoke seals please do not hesitate to contact us via e-mail at or by phone on 01344 876955 or even freephone 0800 0272470.

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