A linear, non-reactive, unmodified polydimethylsiloxane. It is a dimethicone with a viscosity of 500 000 mm²/s. BELSIL® DM 500000 is characterized by low surface tension and high spreading coefficient. Due to its flexible polymer backbone, this dimethicone has high permeability to gases (e.g. water, vapour, oxygen), which allows respiration of the skin.