PU foams are polyurethane-based expanding foams used for thermal and acoustic insulation in joints around window and door frames. Soudal is the world largest manufacturer of polyurethane foams, with many patents including Genius Gun® and Click & Fix®. The Soudafoam range includes Soudafoam Window & Door SWS, an airtight expanding foam based on Soudal's FLEXIFOAM® Technology.