Product Description

FireMastic-300™ (Fire and Acoustic Sealant)

Flexible fire and acoustic rated acrylic intumescent sealant. Suitable for sealing joints, linear gaps and service penetrations. Our 5 hour fire rated sealant offers the best fire rating of all acrylic and PU sealants on the market, offering maximum protection from fire and smoke in both integrity and insulation. With an FRL of up to -/300/300, FireMastic-300™ is unrivalled.

As an acrylic emulsion, FireMastic-300™ is simple to use and cleans up easily in water.

Other Key Features are:

  • 5 hours industry leading mastic offering up to FRL of -/300/300
  • Acoustic reduction up to 67dB
  • Used for sealing linear gaps and around service penetrations such as ducts, dampers, cables and metallic pipes
  • Certified for use in concrete, plasterboard, masonry, AAC, Hebel, Speedpanel, Korok, AFS, shaftliner, Dincel and timber installations
  • Approved to AS1530.4(2014), AS4072.1 and BS EN1366
  • Highly flexible, up to 40% movement
  • High yield so installation material costs and labour are both decreased
  • Gap widths up to 50mm
  • Available in standard colours of grey and white, other colours available upon request
  • Widely adaptable to seal around other passive fire products such as dampers, pillows, collars and batts
  • Can be painted once cured

Call our Tech Services team on 1300 50 BOSS to find out more about how FireMastic-300™ can assist your project needs.


Datasheet     Safety Data Sheet     VOC

Product Details

Part ID : FM300

Size :

  • 300mL cartridge
  • 600mL sausage

Colour : Grey and White