Silicon dioxide; oxides; inorganic acids; silicates; inorganic salts for industrial purposes; chemical thickening agents for use in molding plastics; stability improving chemicals for use in the manufacture of industrial products; viscosity improving chemicals for use in the manufacture of industrial products; fillers for use in adjusting viscosity and hardening strength of sealant; rubber processing preparations; chemical intensifiers for rubber; rubber preservatives; rubber modifying chemic...