Definition
Intumescent describes something that swells or expands when exposed to heat, particularly in the context of fireproofing. Imagine a special coating on steel beams that puffs up into a thick, insulating layer when a fire starts. Unlike regular materials, intumescent substances react to heat by increasing in volume. This reaction helps protect underlying materials from the fire's intensity. It is similar to a protective shield activating. This process delays the spread of fire.