Abstract: A method of treating a glass cylinder for a piston-cylinder arrangement for reducing the friction of a piston on an inner cylinder wall of the glass cylinder includes: elevating surface energy of glass of an interior bounded by the inner cylinder wall and hence lowering a contact angle of the glass with water. The contact angle is lowered by: a gas discharge that acts on the glass at the inner cylinder wall and is generated by an electric or electromagnetic field; or the action of ozone on the glass surface. The glass with the lowered contact angle is contacted with water to form a water film on the contacted glass.

Abstract: Embodiments described herein include a safety system including a needle guard assembly, where the needle guard assembly can be configured for attachment to a needle retaining device having a proximal end, a distal end, where a needle can be fixedly coupled to the distal end. The needle guard assembly can include a first cylinder, where the first cylinder can be attached to the distal end of the needle retaining device. The needle guard assembly can include a second cylinder, where the second cylinder can be selectively movable relative to the first cylinder from a first position, to a second position wherein the needle is fully exposed, to a third position where the needle is fully covered.

Abstract: A safety system including a needle retaining device that can include a proximal end, a distal end, and a needle fixedly coupled to the distal end of the needle retaining device. The safety system can include a needle guard assembly, where the needle guard assembly can be configured for attachment to the distal end of the needle retaining device. The needle guard assembly can include a first cylinder, where the first cylinder can be attached to the distal end of the needle retaining device, and a second cylinder, where the second cylinder can be selectively movable relative to the first cylinder from a first position, to a second position wherein the needle is fully exposed, to a third position wherein the needle is fully covered.

Abstract: Disclosed are pressure vessels, especially an aerosol container, which comprise an interior that is subdivided into a storage chamber (3) and a propellant chamber (4) and are operated by means of a two-phase propellant. The gas phase (5) of the propellant encompasses carbon dioxide while the liquid phase (6) encompasses polyethylene glycol and/or a (C1-C4) monoether and/or a (C1-C4) diether of a polyethylene glycol, and carbon dioxide that is dissolved therein.

Abstract: Disclosed are pressure vessels, especially an aerosol container, which comprise an interior that is subdivided into a storage chamber (3) and a propellant chamber (4) and are operated by means of a two-phase propellant. The gas phase (5) of the propellant encompasses carbon dioxide while the liquid phase (6) encompasses polyethylene glycol and/or a (C1-C4) monoether and/or a (C1-C4) diether of a polyethylene glycol, and carbon dioxide that is dissolved therein.

Abstract: The invention relates to a hydrostatic training device. The hydrostatic training device (1) comprises a frame body (12) to which a hydrostatic pump (3) is fixed. Furthermore, a hydrostatic consumer (5) is connected to the hydrostatic pump (3) in a hydrostatic, closed circuit. The training device (1) furthermore comprises a control console (23) for controlling the hydraulic circuit.