Dowsil Firestop 400 Intumescent Acrylic Sealant

The Dowsil Firestop 400 is an intumescent acrylic sealant designed for maintaining fire-rated integrity in internal partition walls and fire barriers. This professional-grade fire safety product has been rigorously tested to BS 476 Part 22: 1987 and BS 476 Part 7: 1987 standards, achieving a two-hour fire rating to ensure compliance with UK building regulations. Formulated specifically for fire protection applications, this sealant expands when exposed to heat, creating an insulating barrier that helps prevent fire and smoke spread through construction joints and service penetrations. The intumescent properties activate under fire conditions without emitting halogenated by-products, making it a safer choice for occupied buildings. Ideal for sealing linear gaps and joints in fire-rated walls, the Dowsil Firestop 400 also resists mildew and mould growth, ensuring long-term performance in internal environments. This white acrylic sealant is particularly suitable for contractors and fire protection specialists working on commercial fit-outs, building refurbishments, and new construction projects where fire compartmentation is critical. Features and Benefits: • Two-hour fire rating tested to BS 476 standards • Intumescent formula expands under heat to prevent fire spread • Does not emit halogenated by-products during fire conditions • Resists mildew and mould growth for lasting performance Specifications: Application: Heat/Fire Colour: White Size (ml): 380