The science behind Injecta Fire Barrier’s passive fire protection
The science behind Injecta Fire Barrier’s passive fire protection

Here at Injecta Fire Barrier, we are independent approved installers of the highly innovative Injectaclad cavity fire barrier system.

As a leading installer, we thought we would analyse why it is so effective as a retrospective cavity fire barrier protective measure.


The science

Passive fire barriers are elements of a building’s design or construction that are intended to contain and slow the spread of fire. They are considered ‘passive’ because they do not need to be activated or triggered to do their job.

The Injectaclad solution uses a fire-resistant sealant that rapidly expands up to 20 times its size on contact with heat.

Fire-resistant sealants are designed to prevent the passage of smoke and flames.

Injectaclad is an acrylic-based graphite sealant, injected into the cavity using a patented method effectively creating a barrier within the void separating floor levels horizontally and individual units when applied vertically.

As an acrylic-based sealant, it contains acrylic polymers which provide adhesion and flexibility.

Graphite has an incredibly high boiling point (around 3,600 degrees) and therefore does not burn and is known for its fire-retardant properties (stopping fire spreading), hence it is a key ingredient of the Injectaclad solution.

Injectaclad is an intumescent material which means it swells and expands when exposed to high temperatures.

A chemical reaction causes it to release gases which helps it rapidly expand to fill the space it occupies. It’s graphite structure means it won’t ignite, and by filling the space it occupies, it stops the flow of flames and the air that fuels them.

Injectclad is fully tested with data reports available for a wide range of cavity situations and has a fire resistance rating of up to 120 minutes. This means it will continue to restrict the passage of fire through cavities and spaces for around 2 hours.

This gives the building occupants more time to safely exit the building while containing the fire to a limited area, giving the fire fighters more time to tackle the blaze before it spreads.


The law

In June 2017, 72 people tragically lost their lives in the Grenfell Tower disaster in Kensington, London.

Fire rapidly spread up the residential tower block’s exterior, accelerated by combustible composite cladding, external insulation and the air gap between them.

In the aftermath, the UK government changed high-rise building regulations to force owners to reduce the risk of fire spreading beneath cladding and through other cavities.

Options include removing cladding – or finding a way to stop the spread of fire behind it, such as installing a passive fire barrier.

The removal of cosmetic coverings and insulation is highly disruptive, creates significant waste and is very expensive.

Injectaclad has become one of the most successful and cost-effective alternative options allowing the building façade to remain in place.


The application

As a thick liquid sealant, Injectaclad can be swiftly injected into cavities using the patented system blocking those voids that would allow flames to spread in the event of a fire.

This is particularly effective in tall multi-storey buildings where it can help limit the risk of smoke and fire spreading throughout the floors.

Once installed, it is long-lasting and resistant to moisture, making it suitable for use in both dry and damp environments.

Our team are continually working to restore fire safety in tall buildings throughout the country.


Injecta Fire Barrier

As the UK’s first independent approved installer of the highly innovative Injectaclad cavity fire barrier system, our business focuses solely on this type of installation.

We have a wealth of experience and an able team who are committed to doing the job right and raising fire safety standards in tall buildings.

New regulations have put pressure on building owners to take action to stop the potential spread of fire, particularly through external cladding and facades.

We are working across the UK to restore fire safety in tall buildings assisting building owners to conform to the new Fire Safety Regulations as well as giving peace of mind to their residents.

More information about Injecta Fire Barrier can be found at