Composite foam panel and method of preparing a panel

摘要

The invention is directed to composite material panels. In one aspect a panel comprises an insulating layer of a solid open-cell foam, with an internal void having an air-tight sealing coating on peripheral surfaces of the void. In another aspect a panel comprises an insulating layer of a solid open-cell foam and a layer of polymeric material having a void formed between the foam and the polymeric layer having an air-tight sealing coating on surfaces of the foam peripheral to the void. In another aspect the panel comprises an insulating layer of a solid open-cell foam and another layer wherein an air tight coating is provided on a surface of the foam. The other layer may be a polymeric layer.