The project objective is to design a novel and cost-effective microcellular nanocomposite foam, with mechanical properties comparable to or better than Balsa wood and PVC foam, allowing for a substitution of these as core materials for lightweight composite sandwich structures. The material will be applicable for widespread industrial use, e.g. within Wind Power, rail, shipbuilding and automotive industries. The project addresses the call objective of developing polymer nanocomposites exhibiting radically enhanced properties and will involve scientific/technological tasks related to the development of microcellular nanocomposites, the structural scale of sandwich structures as well as the structural and mechanical analysis of the new material. Demonstration activities within the project will aim to validate the potential of the material for industrial use within different industries, with special emphasis on Wind Power through the full-scale static testing of a demonstrator blade.