Chemicals for use in industry, in particular silicones, hydrocarbons and mixtures thereof; chemicals for industry, namely, fluorinated compounds, preferably in ultrapure form, fluorinated silicones, fluorinated hydrocarbons and mixtures thereof, hydrophilised and lipophilised silicones, hydrophylised hydrocarbons and all mixtures of the aforesaid silicones; chemicals for use in industry, namely, silicones and hydrocarbons and mixtures with further chemicals; semi-fluorinated alkanes, liquid p...