Intumescent Sealant

CharCoat Intumescent (IS) (formally CharCoat Intu Sealant) is designed to prevent the spread of fire and smoke through joints and openings in fire rated walls and floors including openings formed around building service penetrations. CharCoat IS will also maintain the acoustic design performance in walls and floors. CharCoat IS cures when it is subjected to atmospheric conditions, however it will retain a degree of elasticity for joint movement. Under fire exposure, CharCoat IS creates a robust fire seal by the formation of a durable intumescent char.

CharCoat IS can be used with a suitable filling material, i.e. stone wool or backing material in order to secure correct width to depth ratio and to reduce the shrinking of the sealant during curing. Minimum depth and maximum width of the joints are included in the installation instructions. Thermal activation takes place at about 180°C when the material will expand (intumesce) and prevent the passage of fire and smoke for periods up to and beyond 4 hours.