The illbruck FM335 Perfect Elastic Foam Pro 880ml is a professional-grade, highly elastic, airtight, and acoustically insulating polyurethane foam. Specifically designed for sealing connection joints around windows and doors, and other construction joints, it offers exceptional movement capability of up to 50%. This advanced foam provides excellent thermal insulation with a low thermal conductivity of 0.035 W/(m·K) and superior acoustic insulation up to 60 dB. It ensures durable, flexible, and energy-efficient seals in various demanding construction applications.