Patent ID: 7700061

Claim:
A heat-resistant material for a low-melting metal casting machine, which comprises 88 to 99.95% by weight calcium silicate comprising at least one member selected from the group consisting of wollastonite (CaSiO 3 ), tobermolite (5CaO.6SiO 2 .5H 2 O) and xonotlite (6CaO.6SiO 2 .H 2 0) and of a fluoride which is at least one member selected from the group consisting of calcium fluoride (CaF 2 ), magnesium fluoride (MgF 2 ) and cryolite (Na 3 AlF 6 ), the fluorine content of the composition is 0.1 to 4.0% by weight, wherein the heat-resistant material has a density of 200 to 2,500 kg/m 3 and a bending strength of 1 to 20 MPa and wherein the material is produced by hydrothermal treatment to generate the calcium silicate.