The Soudal Trade B1 Fire Rated Expanding Foam Hand Held 750ml is a professional-grade product specifically designed to provide a fire-resistant seal. This polyurethane foam has excellent adhesion on most substrates, including wood, concrete, metal, and plastic. It also boasts significant thermal and acoustic insulation properties. The foam can expand up to 40 times its original volume, making it perfect for gaps filling, insulation and installation tasks.