Material used in the production of calcareous sandstone comprises chalk, sand, water and additives to raise the suppleness of the material in the non-hardened state

摘要

Material comprises chalk, sand, water and additives to raise the suppleness of the material in the non-hardened state. An Independent claim is also included for a process for the production of calcareous sandstone comprising producing the calcareous sandstone using an extrusion/extrusion molding process, in which the material to be molded is pressed using a tool and then hardened.