34f08f34_rials_patent_application_class__Description
20120199309 08-09-2012 [Description] 
SAND ADDITIVES FOR MOLDS/CORES FOR METAL CASTING - A foundry mix composition including silica sand, unexpanded perlite ore, and a binder material. The unexpanded perlite ore is present in the foundry mix composition from about 0.5 wt % to about 5.0 wt %. Exemplary embodiments of the present invention also contemplate methods of making a sand mold/core from such a foundry mix composition.
Utilizing particular mold materials patent application class