Abstract: Injection medium in the form of a dry mixture for preparing an injection suspension for sealing and/or reducing the penetrability of soils (loose rocks) and/or stone and/or structures against penetration by fluids, especially by water and gases, containing at least one mineral binder, especially a superfine binder, at least one stabilizer, at least one solvent and optionally other customary additives, such as at least one setting accelerator, an injection adjuvant and a water-retention agent, while the stabilizer is at least one organic thickener and the mixture additionally includes at least one essentially inert, superfine filler.