Patent ID: 7658990

Claim:
A super light weight ceramic panel comprising a multiplicity of closed pore structures produced by trapping carbon dioxide gas generated via oxidation of silicon carbide and oxygen gas generated via reduction of iron oxide within a vitreous phase produced by expandable clay mineral and glass, wherein the ceramic panel, is made of a composition, consisting of 90 to 98% by weight of an expandable clay mineral, 1 to 5% by weight of glass, and 1 to 5% by weight of silicon carbide, and wherein the expandable clay mineral consists of 61.5 to 70% by weight of SiO 2 , 15 to 20% by weight of Al 2 O 3 , 1 to 5% by weight of Fe 2 O 3 , 2 to 4% by weight of CaO, 1 to 3% by weight of MgO, 0.5 to 1.5% by weight of K 2 O and 2 to 5% by weight of Na 2 O, wherein the closed pore has a pore density of 343 to 1000 pores/cm 3 , and wherein the closed pore has a pore volume of 74 to 89%, relative to the total volume of the panel.