FireMastic 300 Sausage

FireMastic-300 intumescent Fire-Rated Acrylic Sealant is a one part acrylic emulsion that is designed to resist the passage of fire, smoke and sound. FireMastic-300 will intumesce and form a char when exposed to the heat of a fire, which will prevent the passage of fire and smoke for up to 5 hours in both integrity and insulation. In normal use it will also maintain the sound reduction index of a structure.


  • High performance 5 hours fire rated mastic
  • Intumescent
  • Up to a 63dB sound reduction
  • High yield, double the usage of most sealants
  • Available in600ml foil sausages