The FIREFLYMasticHP is a high-pressure exerting intumescent sealant designed to effectively seal and close off various services penetrating through core holes in different fire-rated substrates or FIREFLYBatt seals. This advanced sealant expands under heat exposure, providing a robust barrier against fire and smoke, thereby maintaining the integrity of fire-rated assemblies. Available in 310ml cartridges and 600ml sausages, FIREFLYMasticHP offers versatility for various application needs. It has been rigorously tested in accordance with AS1530.4-2014 and assessed per AS4072.1-2005, achieving a Fire Resistance Level (FRL) of up to -/240/240, depending on the specific system configuration.