Intumescent Acoustic Mastic

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. This maintains fire integrity when sealing around pipes and cables that penetrate walls. Sealant remains highly flexible after installation.

In normal use the mastic will maintain the sound reduction index of a structure. It has been independently tested to BS 476: Part 20 and 22: 1987 and EN1366-4. Provides up to 300 minutes of fire resistance depending on depth/ width and volumetric area.

It has good unprimed adhesion to a wide variety of common building substrates. Although we do recommend that a small area is tested on unusual substrates. Available in 310ml cartridges in white, brown or grey colours.


  • Intumescent mastic with acoustic rating
  • Advanced intumescent formulation
  • Fire tested to: EN 1366-3 EI 120, EN 1366-4 and BS 476 Part 20 and 22 1987
  • Fire classification to EN 13501-2
  • Tested with metallic pipes, cables, cable bunches, cable trays and cable ladders
  • Causes no known adverse effects to plastic pipes, plastic cables, sheathing or metallic components
  • Joint movement capability of +/- 20%.
  • Highly flexible and water resistant.
  • Halogen free, resists fungi and vermin
  • Certifire approval
  • CE marked
  • 310ml cartridge


  • WHT

  • BRN

  • GRY


Intumescent Acoustic Mastic
Product code: FS4903
£4.71 Ex. VAT
Intumescent Acoustic Mastic
Product code: FS4904
£4.71 Ex. VAT
Intumescent Acoustic Mastic
Product code: FS4905
£4.71 Ex. VAT
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