Bostik Firecaulk

Fire-rated acrylic based gunnable sealant for joints and service penetrations in interior and exterior non-exposed applications

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.
  • Overview


  • Description


    Sealing of gaps around pipes, 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.


    • Fire rating 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
    • 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, white, grey and limestone.


    • Bostik Firecaulk is not recommended for water immersion, exposed external joint sealing or areas subject to heavy traffic.
    • Bostik Firecaulk should not be applied with wet tooling techniques using solvents, water or detergent solution is not recommended.
    • Bostik Firecaulk should not be applied to surfaces with special protective or cosmetic coatings without prior consultation with the manufacturer. Such surfaces include, but are not limited to, mirrors, reflective glass, or surfaces coated with Teflon, polyethylene or polypropylene.
    • Bostik Firecaulk can be affected by water before or during cure. The sealant should not be stored, applied or cured in areas where unusually high humidity or free water is present during the application or initial cure.
    • Bostik Firecaulk should be allowed to cure prior to subjecting to any intermittent water exposure.
    • Do not apply to surfaces with temperature under 5ºC, as cure will be retarded.
  • Performance

  • Compliances and Accreditations


    • AS1530.4-2014
    • AS4072.1-2014
  • Systems & Installation



    Bostik Firecaulk should be applied to a minimum depth of 6mm, maximum width of 40mm. The ratio of joints width to sealant depth should be approximately 2:1. Joints width should not be less than 6mm.

    The joint depth must allow a sealant depth, after installation of backer rod or bond breaking material, of a minimum of 6mm. Lap shear joints should have a bead width equal to, or greater than twice the anticipated movement. A conservative design practice, which uses a portion of the sealant's movement capability as a safety factor is recommended. Sealants are subject to cohesive failure when the actual movement is greater than their rated capability.


    Clean all surfaces by removing foreign matter and contaminants such as oil, dust, grease, frost, water, surface dirt, old sealants and any protective coating. Porous substrates should be cleaned by grinding saw cutting or blast cleaning (sand or water). Dust, loose particles, etc should be blown out of joints with oil free compressed air or vacuum cleaned. Non porous and plastic surfaces should be cleaned by solvent or mechanical means. Cleaning solvents should not be allowed to air dry or evaporate without being wiped with a clean, dry cloth.

    Note: priming is not required unless surface to be bonded is in poor condition or exceptionally porous. Consult Bostik Technical department for advice on priming


    Bostik Firecaulk when used as an adhesive or sealant should be dispensed from either the cartridge or sausage sachet by means of a hand or air operated caulking gun designed for such application (available from Bostik). Cut the cartridge and screw on the supplied nozzle. Having previously cut this to give the required angle and bead size. Place the cartridge in a suitable Bostik extrusion gun and press the trigger. For sausages, a barrel gun is required, this is available from Bostik. Clip the end of the sausage and place complete sausage with pierced end located at the top of the nozzle. Screw top of nozzle and housing on barrel of gun. Using the trigger on the gun extrude product from the sausage to stop product flow, using the thumb depress the catch plate mechanism located at the very rear of the gun, directly above the trigger. Apply Bostik Firecaulk in a continuous operation using positive pressure adequate to properly fill and seal a cavity.

    Method of Application:

    Surfaces to be sealed should be clean, dry and free from oil, grease, dust, dirt and mould release agent. Install back-up material or joint filler as specified. Apply Bostik Firecaulk sealant in a continuous operation using a positive pressure adequate to property fill and seal the joint or penetration. Tool Bostik Firecaulk with sufficient pressure to spread the sealant against the back-up material and onto the joint surfaces. A tool with a concave profile is recommended to achieve the correct shape


    Linear Meters per 600ml sausage (Approx.)


    The cure rate is dependent on the bead size (width & depth), and is greatly affected by temperature, humidity, and the presence of water and moisture on the substrate. Approximate cure rates at 23°C and 50% RH are as follows:

    • 1mm – 1 day
    • 3mm – 5 days
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    Bostik Firecaulk

    Fire-rated acrylic based gunnable sealant for joints and service penetrations in interior and exterior non-exposed applications

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