73234756
Oct 11, 1979
Jan 26, 1982
Pulverized Silica Sand for Use in the Ceramic Porcelain Industry, Concrete Additives Industry, Plastic and Resin Fillers Industry, Scouring Powder Industry, Foundry Mold Washes Industry, and in the Production of Fiber Glass and Sodium or Potassium Silicates
Chemicals