A one part intumescent acrylic mastic for sealing gaps around fire doors, window frames and for sealing joints, voids and irregular holes in fire rated structures.
The sealant forms a char, preventing the passage of fire and smoke, when exposed to the heat of a fire. This maintains fire integrity when sealing around pipes and cables that penetrate walls. Sealant remains highly flexible after installation.
In normal use the mastic will maintain the sound reduction index of a structure. It has been independently tested to BS 476: Part 20 and 22: 1987 and EN1366-4. Provides up to 300 minutes of fire resistance depending on depth/ width and volumetric area.
It has good unprimed adhesion to a wide variety of common building substrates. Although we do recommend that a small area is tested on unusual substrates. Available in 310ml cartridges in white, brown or grey colours.