| abstract |
A molded inorganic plate having good dimensional stability and sound and heat insulating properties, which is composed of two surface layers each comprising a hardened mixture of 30 to 60 wt % of cement, 30 to 60 wt % of siliceous substance, 0 to 15 wt % of perlite and 5 to 25 wt % of flake and/or wood flour, and a porous core layer comprising a hardened mixture of 30 to 60 wt % of cement, 30 to 60 wt % of siliceous substance, 0 to 15 wt % of perlite and 5 to 25 wt % of wooden fiber bundles. |