Composite panel

Abstract

A composite panel comprises first and second sheets 20, 22 of a natural fibre material such as corrugated cardboard, each sheet 20, 22 having been impregnated with a liquid composition comprising a thermosetting resin, an extending liquid for the thermosetting resin and a catalyst for the thermosetting resin, the thermosetting resin having been polymerized, a cellular core 10 of a natural fibre material such as kraft paper, the cellular core 10 having been impregnated with a liquid composition comprising a thermosetting resin, an extending liquid for the thermosetting resin and a catalyst for the thermosetting resin, the thermosetting resin having been polymerized, the cellular core 10 being sandwiched between and adhered to the first and second sheets 20, 22; and a filler composition located in all of the cells of the core 10, the filler composition comprising a mixture of an inorganic insulating material and a material which releases water at elevated temperatures, in granular form. The composite panel is an acoustic absorber and thermal insulator and is fire resistant.

Dependencies are inferred from the claim text.