A method of forming a reinforced foam structure or laminate wherein a low density, fast reacting liquid foamable resin is sprayed under pressure into a low density fiberglass mat to penetrate and wet the fibers. The foam then expands within the fiberglass mat, forming a low density foam sheet having...http://www.google.de/patents/US4372900?utm_source=gb-gplus-sharePatent US4372900 - Method of forming reinforced foam structure
