What is the purpose of intumescent coatings?

Intumescent coatings are specialized fireproofing materials designed to protect structural elements in the event of a fire. When exposed to high temperatures, these coatings chemically react and expand significantly, forming a thick, insulating char layer. This char acts as a thermal barrier, slowing down the heat transfer to the underlying material, such as steel or wood, thereby maintaining the structural integrity for a longer period during a fire.

This ability to expand and create an insulating barrier is crucial in preserving the load-bearing capacity of a structure, allowing more time for occupants to evacuate and for firefighters to control the blaze. It is this unique expanding property that is central to the function and effectiveness of intumescent coatings in passive fire protection strategies.