Soudal Expanding Foam B3 Hand Held 750ml is a premium quality polyurethane foam, designed to fill and insulate gaps, cracks, and openings in various building components. Its suitable for professional builders as well as DIY enthusiasts due to its easy-to-use handheld design. The foam expands on application, providing high thermal and acoustical insulation while also offering excellent adhesion on most substrates. Resistant to water, heat and many chemicals, it also prevents the passage of air, dust and pests.