The superior 5-hour sealant offers the best fire rating of all acrylic and PU sealants on the market. BOSS FireMastic-300 offers maximum protection from fire and smoke in both integrity and insulation. With fire resistance of up to 5 hours (FRL -/300/300) for most applications, FireMastic-300 is unrivalled. It’s intumescent, therefore more efficient and requires half the volume of sealant than most other brands, increasing its yield and reducing material and labour costs.

Key Features:

5-hour fire rating - industry-best
Superior acoustic reduction up to 65dB
Used for sealing linear gaps in floors, walls and ceilings and around ducts, dampers, cables and metallic pipes
Suited to plasterboard, masonry, Hebel, Speedpanel, concrete and timber wall installations
Approved to AS1530.4, AS4072.1 and EN1366
Remains flexible once cured
High yield so installation material costs and labour are both decreased
Available in grey and white, other colours available upon request
Widely adaptable to seal around other passive fire products such as fire dampers, pillows, BOSS Batts, Fyreboxes and cable & pipe penetrations
Can be painted once cured
Easy clean up with water
Nontoxic, halogen free. Low VOC of 102g/L

FireMastic-300 intumescent Fire-Rated Acrylic Sealant is a one-part acrylic emulsion that is designed to resist the passage of fire, smoke and sound. When exposed to fire heat, FireMastic-300 will intumesce and form a char preventing the passage of fire and smoke for up to 5 hours. FireMastic-300’s superior acoustic properties mean it offers up to a 63dB sound reduction, making it ideal for high performance STC installation.

FireMastic-300 is first choice within the industry as it offers maximum protection, reduced costs and as an acrylic emulsion, is simple to use and cleans up easily in water.

BOSS Fire & Safety

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BOSS FireMastic-300: The unrivalled, highest performing fire sealant offering maximum protection

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