A reactive layer at normal film thickness
At everyday temperatures, thin-film intumescent coating resembles a paint finish. When exposed to elevated temperatures, it reacts and expands into a much thicker insulating char.
The objective is to delay steel heating
The char slows heat transfer so the protected steel can remain below its design limiting temperature for the required resistance period supported by the assessed system.
Application is one part of a complete system
Design inputs, product selection, substrate preparation, primer compatibility and the specified coating build all contribute to the installed system.
Project note
Final product selection, thickness and acceptance criteria must follow the approved tested system, responsible design and project specification. This article is contractor guidance, not a substitute for project fire engineering.
Relevant local planning
Put this guidance into a local project context.
These planning guides help organise site, access, and programme information for suitable mobile work packages. They do not imply a permanent local office.