Patent ID: 8377560

Claim:
An inorganic calcined substance, comprising: a base material; under-coating glaze layer disposed on the base material, the under-coating glaze layer comprising a glaze composition; and an over-coating glaze layer disposed on the under-coating glaze layer, the over-coating glaze layer comprising B 2 O 3 wherein the inorganic calcined substance is formed by calcining the under-coating glaze layer and the over-coating glaze layer disposed on the base material at temperature of 1200° C. or less, the glaze composition of the under-coating glaze layer comprising: a plastic material; a non-plastic material; and a solvent material, wherein the plastic material comprises at least one material selected from the group consisting of Gairome clay, Kibushi clay, kaolin and talc, the non-plastic material comprises at least one material selected from the group consisting of silica, calcined kaolin, pottery stone, pyrophyllite, pottery shards, chamotte and zircon, the solvent material comprises at least one material selected from the group consisting of feldspar, lime stone, dolomite, zinc oxide and lithium carbonate, the amount of the plastic material is 25-55 weight %, the amount of the non-plastic material is 5-20 weight %, and the amount of the solvent material is 40-60 weight %, based on a total solid content, and the base material comprises: a hydraulic inorganic material; a vitreous material, an aggregate; a reinforcing fiber; a burnable organic component; and a recycled waste material as a main component.