What is Intumescent paint?

Intumescent paint, an efficient way to protect structural steel from fire

Intumescent paint is a reactive coating, when exposed to high temperature, the fire resistant paint expands in a controlled manner to many times its original thickness, producing a carbonaceous char formed by a large number of small bubbles. The material forms an insulating layer which slows the temperature of the steel rising to a critical level. In ambient conditions the thin coating allows for the steel structures to maintain their usual form rather than being boxed in with a board or covered with fire spray.

Intumescent pain for structural steel protection

Promat Intumescent paint

How does Promat Intumescent paint work?

Cafco SPRAYFILM® WB3 is a water based intumescent coating consisting of polyvinyl acetate resins and fillers for the fire protection of structural steel. During a fire a chemical reaction takes place which causes the coating to swell. This charring effect of the coating absorbs the heat from the fire, slowing the heat transfer into the structural steel.

How do you apply Cafco SPRAYFILM® WB3?

It is preferably spray applied with airless paint equipment for speed and quality of finish. Brush and roller application is also possible to use default global value.

What kind of paint can help in fire prevention?

Intumescent Paint and  Vermiculite Sprays are very popular for the use of fire protection of structural steel in Australia.   Read our article about the 2 major protective coatings for structural steel.

How long does fire resistant paint last?

It depends of the product/brand and the application. Cafco SPRAYFILM® WB3 provide up to 120/-/- fire resistance in accordance with the requirements of AS 1530: Part 4: 2014 & AS4100.

How to apply Intumescent Paint?

Application methods can vary depending on the product used however it may only be applied by a trained and approved installer and according to the manufacturer instructions – Cafco SPRAYFILM® WB3 is preferably spray applied with airless paint equipment for speed and quality of finish. Brush and roller application is also possible.

Where to apply Intumescent Paint?

Intumescent Paint is commonly used in construction for fire protection of structural steel columns and beams.
Cafco SPRAYFILM® WB3 can be applied to both open and hollow steel sections and is suitable for galvanized or mild steel structures (with applicable primer).
It should be installed by a trained or approved applicator using appropriate and recommended equipment. The end user must determine the suitability of any particular design to meet the performance requirements of any application before undertaking any work. If in doubt, please contact us.

Promat Intumescent paint products

Showing 1 Product

Other Application Categories

Showing 3 Categories

fireboard steel for fire resistant construction

Steel protection using Boards

Steel protection using Vermiculite Spray

Steel protection using Cementitious spray


Get the latest news and inspiration.