1. swelling or expanding, especially as a result of heat or chemical reaction
Usage: present participle of intumescing; technical/scientific context

Examples

• The intumescing foam in the fire-resistant coating expanded to seal the gap.
• When exposed to high temperatures, the material began intumescing and forming a protective char layer.
• The intumescing paint swelled up to block the spread of flames.
• Scientists observed the polymer intumescing as the temperature increased.
• The intumescing reaction created a thick, insulating barrier against the heat.