Buildtec Acoustic Sealant is a one-part flexible acrylic waterbased acoustic mastic. It is specifically formulated to form an acoustic and fire rated intumescent barrier by sealing gaps between plasterboard walls, floors and ceilings, dry linings, and lined insulation boards. It adheres to all construction substrates and can be painted within one hour, dependant on temperature and humidity.

Emulsion acrylic based it gives a firm yet flexible seal to joints in a variety of fire rated structures. It will not support combustion and when subjected to heat, chars and intumesces preventing the spread of smoke and fire through the joint. S290 is a 4 hour rated intumescent sealant formulated with fillers that provide noise reduction tested to BS 476: Part 20:1987 for fire protection joints and in accordance with BS EN ISO 140-3:1995 for acoustic performance.


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  • Excellent acoustic performance
  • Stops noise leakage through gaps in floors and walls
  • Perfect for internal perimeter pointing of fire rated door and window frames
  • Enhances soundproofing
  • 4 hour fire rating
  • Prevents spread of smoke and fire
  • Size – 380ml