Low density buoyant products having specific gravity lower than water and each close cell layer having a thickness of 1 mm

摘要

Low density semi-finished product for manufacturing buoyant products, comprising a plurality of layers (3) of closed-cell expanded material, having a specific gravity lower than that of water, the layer (3) being flexible and elastic and being joined together by quilting (4, 5) spaced so as to define between them pockets of air, characterised in that the said quilting (4, 5) is preferably distributed in closed patterns.