Steel protection

Intumescent & Fire Retardant Coatings

Steel does not burn. It softens. A column that is fine at 400°C starts losing its strength well before the fire is out, and the frame goes with it.

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Fire retardant coating being applied on a Hyderabad site — **Applied, then measured**Thickness is checked with a gauge at recorded points, not judged by eye.

UL Listed

Armacell fire stop systems

CBRI

CBRI Certified

Ameetuff mortar & coatings

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IV

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Before, during and after

In one paragraph

What it actually is.

Intumescent coating is a paint that swells when it gets hot. It expands many times its thickness and turns into an insulating char layer that slows how fast the steel underneath heats up. That delay is what gives people time to get out and the fire service time to get in. We apply CBRI certified Ameetuff coatings to steel, GI ducts, concrete and cable trays.

People are surprised that steel is the vulnerable part. Concrete chars slowly; steel just gets soft. Once a structural section passes roughly 550°C it has lost about half the strength it was designed with, and in an unprotected steel frame that can happen in well under twenty minutes. The coating does not stop this — nothing does — it buys time. How much time depends on three things that all happen on site, not in the specification: how clean the steel was before painting, how thick the coating actually went on, and whether damaged patches were repaired before the ceiling closed.

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Intumescent and Fire Retardant Coatings — Simfy Firesys

Detail

The three things that decide whether it works

Surface preparationCoating over rust, mill scale or an incompatible primer means it will lift. Once it lifts it is not protecting anything. The steel gets prepared properly or the rest is decoration.

Dry film thickness, measuredThe required thickness comes from the steel section and the protection period you need. It is checked with a gauge, at recorded points — not judged by eye. We write down where each reading was taken.

Damage repaired before it is hiddenSteel gets knocked during follow-on trades. Every chip is a hole in the protection. We walk the frame again before ceilings close and make good.

On site

Where we apply it

Structural steelColumns, beams and bracing — the parts holding the building up.

GI ductsDucts that pass through fire-rated compartments and would otherwise carry heat straight across.

Cable trays and HT/LT runsLong cable runs are one of the most common fire-spread paths in hospitals and data centres.

Concrete walls where specifiedUsed where a specific rating has to be reached on an existing element.

FAQ

Questions we get asked about this

How thick does intumescent coating need to be?There is no single answer — it is set by the steel section factor and the fire resistance period the design calls for. A light section needs more coating than a heavy one for the same rating. The specification should state it, and the site record should prove it was achieved.

Can it be painted over?Only with a compatible topcoat. An ordinary decorative paint can seal the surface and stop the coating expanding the way it was tested to. If a topcoat is wanted, it has to come from the same system.

Does it work on existing steel in an occupied building?Yes, with the right preparation and a water-based product to keep odour and downtime low. The constraint is usually access rather than the coating itself.

How do we know it was done right after the ceiling closes?You will not be able to see it, which is exactly why the thickness readings and photographs matter. Ask for them at handover, not a year later.