Chemical substances in the nature of chemicals for use as retarders, fluidifier and deflocculants for use in industry, and in the fields of construction and building; chemical substances in the nature of chemicals for use as stabilizer in cement slurries, in bentonite slurries or mixed-mud-systems; bentonite-based chemical additives and rinsing agents for execution of earth drillings, for construction of diaphragm walls, pipe-jacking, tunneling, drilling, caisson, shaft- and well-sinking and ...