Project Description

Intumescent Mastic

Intumescent Mastic

Our Intumescent Mastic is 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.

Maintains fire integrity when sealing around pipes and cables that penetrate walls. Suitable for flexible walls, rigid walls & floors


  • in Block Wall, Concrete, Masonry and Plasterboard Partition.
  • in Linear Joints up to 50mm wide tested in large service openings up to 490 x 150mm.
  • for sealing of linear joints in concrete floors, masonry walls and plasterboard including head of wall details.
  • around metallic pipes, cable trays, cable bunches, small, medium and large cables.


  • Specialist Coatings


  • 300ml


  • N/A

Fire Rating

  • Fire Resistance EN 1366-3 EI 120

  • EN 1366-4 EI 240

  • BS 476 300 mins.

  • Fire Certification to EN 13501-2