BOSS FireMastic-300 acrylic intumescent sealant required by many BOSS firestopping systems.
– Both fire and acousticly rated
– Highly flexible (up to 40% movement)
– Fill gaps up to 50 mm wide
– Used in tests up to 5 hour fire rating
BOSS FireMastic-300 is a flexible, fire and acoustic rated intumescent sealant. It is most commonly used for sealing joints, linear gaps and service penetrations. It has been tested in systems that offer up to 5 hours of fire rating in integrity and insulation. BOSS FireMastic-300 remains flexible, allowing up to 40% movement and can be painted once cured. BOSS FireMastic-300 is available in 300ml tubes and 600ml sausages and can be bought in either white or grey.
Please make sure you follow the tested system, both in products and installation.