Fire Sealant 300 is an intumescent and acoustic acrylic sealant that swells when exposed to temperatures in excess of 150°C to prevent the passage of fire and smoke and has a fire rating of up to 5 hours, Fire rated to BS 476 part 20/EN1366-4 (2006). Typically used for sealing joints, voids and irregular holes in fire walls, partitions and other structures; also for maintaining the integrity of pipes and cables that penetrate them. For internal perimeter pointing of fire rated door and window frames. Acoustic rated to BS EN ISO 140/3. Tested for air permeability to EN13141-1 Ventilation fo buildings. Performance testing of components/products for residential ventilation.