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Intumescent Mastic Seals

Intumescent Mastic Seals are very important for fire protection particularly if is an old building.
  /  Intumescent Mastic Seals
Intumescent Mastic Seals

Intumescent Mastic Seals

Intumescent Mastic Seals are a water-based acrylic sealant, which cures to give a firm but flexible fire seal. Suitable for use in various construction joints offering up to 30% movement capability whilst providing an excellent acoustic and air seal.

Intumescent Mastic is suited for use around non- combustible services, cables, rock fibre insulated non-combustible pipes, using a minimum depth of 25mm. Intumescent Mastic has excellent adhesive qualities and can also be used for the bonding and pointing of joints and service penetrations in conjunction with Fire Batt systems.



  • Flexible water based intumescent acrylic sealant
  • Tested to BS476 Part 20/22 & EN 1366-3, EN 1366-4
  • Up to 4 hours fire resistant
  • Long term flexibility
  • Excellent adhesion

Talk to us about
Intumescent Mastic Seals as used in our
Passive Fire Protection service

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