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 tha
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