Silicon dioxide; oxides; inorganic acids; silicates; inorganic salts for industrial purposes; thickening agents for use in the manufacture of inks; thickening agents for use in the manufacture of paints; chemical thickening agents for use in molding plastics; stability improving agents for use in the manufacture of industrial products; viscosity improving agents for use in the manufacture of industrial products; fillers for use in adjusting viscosity and hardening strength of sealant; rubber ...