Intumescent paint is a smart, discreet fire protection solution for exposed steelwork. Applied like standard paint but engineered for life safety, it swells into a tough insulating layer during a fire, which slows down heat transfer and helping the steel retain its strength far longer than it would unprotected.

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How Intumescent Paint Protects Steel

Transforms Under Heat

At everyday temperatures, it looks like normal paint. But once exposed to fire or temperatures above 120°C, it begins a chemical reaction.

Swells Into an Insulating Char Layer

The coating expands up to 50 times its original thickness, forming a dense carbon char that shields steel from intense heat.

Prevents Structural Failure

By slowing the rise in steel temperature, the coating helps prevent the steel from reaching its critical failure point (around 550–620°C), which drastically reduces the risk of structural collapse.

Buys Crucial Time for Safety

This delay supports safe evacuation, keeps escape routes stable, and helps emergency services contain the fire more effectively.

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Benefits of Intumescent Coatings

Maintains Structural Integrity

Keeps steel load-bearing for far longer by delaying heat transfer.

Life-Safety Focused

Gives occupants and responders the time they need in an emergency.

Passive Fire Protection

No activation required; it performs instantly when exposed to heat.

Aesthetic Flexibility

Can be finished in a wide range of colours and textures, ideal for visible or architect-led projects.

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Application & Key Considerations

Primer Application

A suitable primer is applied first to ensure proper adhesion and a smooth, durable base.

Correct Thickness is Critical

Coating thickness is calculated based on the steel size, mass factor, fire exposure and required rating (30, 60, 90 or 120 minutes).

Project-Specific Calculations

We determine the exact amount of paint needed to ensure compliance and performance under fire conditions.

Top Coats for Protection

Once the intumescent layer cures, a top coat may be applied, especially for external or high-moisture environments, for long-term durability and a clean finish.