Patent ID: 7407145

Claim:
A core for molding constituting a forming mold for molding a hollow ceramic molded article integrally having a hollow body part and a narrow pipe part, the core for molding comprising: a mold core article comprising one of wax and a waxy substance and having an outer shape corresponding to an inner shape of the hollow body part of the hollow ceramic article to be molded; and a pin, having an outer shape corresponding to an inner shape of the narrow pipe part of the hollow ceramic article to be molded, pierced through the mold core article to protrude therefrom; wherein the one of the wax and the waxy substance constituting the mold core article has a melting point within a range from 30° C. to 80° C., a viscosity at melting of 10 ps or less, and a volume change ratio by molten-solid phase transition of 5% or less.