The idea of a structural sandwich panel consisting of two faces or “skins” and a “core” of bubbles full of air, is not new. The novelty lies, rather, in its inline coextrusion without the use of glues, and Bubble Guard® Board meets this requirement. We refer to the original solution completely made of polypropylene, created by Imballaggi Protettivi of Massalengo (Lodi).