Disclosed is a layered composite system comprising one or several layers a made of an open-cell foam based on an aminoplast, and one or several layers b made of nonwoven fabric or fibrous tissue.

A open cell polyurethane rigid foam for vacuum panel core material was prepared. The open cell percent of the core material is about 95%.

The results showed that the honeycomb laminates had an interlinking open cell structure without remarkable interface between silicone rubber and silicone rubber foam;