Intumescent Coating

Intumescent coatings are specialized fire-resistant coatings designed to help protect structural components from fire damage. When exposed to high temperatures, the coating expands and forms a thick, insulating char layer. This barrier slows heat transfer to the underlying substrate, helping the assembly maintain its load-bearing capacity for the period required by the specified fire-resistance system.

How intumescent coatings work

The coating system contains components that react together under heat to create a stable char. Because intumescent material can be applied as a comparatively thin architectural finish, it is often selected when structural steel must remain visible while still meeting passive fire-protection requirements.

Common coating types

• Water-based systems: low-odor, lower-VOC options commonly used for compatible interior and selected exterior assemblies.
• Solvent-based systems: durable systems used where the approved specification calls for greater environmental or moisture tolerance.
• Epoxy intumescent systems: robust coatings used for demanding industrial, marine and high-risk environments.

Typical applications

• Structural steel beams, columns and exposed framing
• Commercial buildings, transportation facilities and public infrastructure
• Industrial and petrochemical facilities
• Selected wood and concrete assemblies when supported by an approved system
• Areas requiring a compatible decorative or protective finish coat

Choosing the right system

Coating selection depends on the required fire rating, tested assembly, member size, substrate, primer compatibility, environmental exposure and finish expectations. Application thickness must follow the approved design and manufacturer requirements. QLP coordinates surface preparation, primer review, application and dry-film-thickness checks to support a consistent, inspection-ready installation.

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