Intumescent Mastic Fireproofing

An intumescent seal slows down the burning process and does not contribute to spread of flames. Therefore, it can minimize the damage by protecting structures, giving fire fighters more time to arrive and take the fire under control as well as fireproofing escape routes allowing for efficient evacuation.

Intumescent seals are known as means of passive fire protection, but what is an intumescent sealant in practice? Also known as expansion sealant, intumescent sealant expands when it becomes exposed to extreme heat and can swell up to 40 times its original volume. The sealant increases in volume but decreases in density forming a char layer. The expanded sealant does not actually catch fire, but the char burns eventually, still much more slowly than most building materials.