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Fire Rated Sealants

Bostik Firecaulk

Bostik Firecaulk is a single component, non-sag, fire rated acrylic based gunnable sealant. A general purpose product for construction joints and the sealing of service penetrations in plasterboard, concrete floors and masonry wall constructions. Bostik Firecaulk is a gun grade acrylic based sealing compound specifically manufactured for sealing low movement interior joints (up to +/- 25%) in masonry and plasterboard to provide a fire barrier for periods up to 4 hours.

Colours: White, Grey, Limestone

600ml, 20 per Box


  • Fire ratings for gaps up to 40mm
  • Designed for Australian conditions
  • Good flexibility joint movement +/- 25%
  • One part no mixing required
  • Very easy to apply and gives a smooth finish
  • Smooth gunnability and tool off finish
  • Low odour
  • Non-toxic
  • Asbestos free
  • Priming not normally required
  • Water clean-up
  • Prevents the passage of hot gases
  • Paintable after 24 hours at 20°C
  • Water resistant after cure
  • Excellent adhesion to metal, wood, plasterboard, all masonry, AAC and hebel
  • Acoustic capabilities with a 67 STC* rating in plasterboard construction
  • Available in three colours; grey, white and limestone


  • Sealing of gaps around pipers, cables, ducts and services which penetrate fire rated walls and floors
  • Installation of fire rated sealant in concrete walls and floors and plasterboard walls
  • For vertical and horizontal joints; interior application requiring acoustic properties or STC rating
  • Perimeter sealing of door and window framing interior
  • Sealing gaps between faced and cladding panels to various building materials
  • For new construction and remedial applications
  • To prevent the spread of fire and smoke through walls and floors