This Soudal Genius Gun Fire & Acoustic Expanding Foam is a fast-curing B1 fire class foam offering exceptional thermal and acoustic insulation. It adheres well to most construction materials and is suitable for both interior and exterior use. Key features include its B1 fire class rating (DIN 4102), fire resistance up to 4 hours depending on joint configuration, and an acoustic rating of 58 dB. The foam provides an insulation factor of 36mW/mK and can be reused for up to six weeks if the bung is attached after use. The Genius Gun applicator allows for accurate trigger control and one-handed application.