Device, their use and methods for the introduction of aggressive gases into a glass melt

A device for the introduction of aggressive gases into a glass melt, said apparatus (1) surrounding a pipe (2) for introducing gas and the tube (2) cooling jacket (3), introduced a cooling medium into the cooling jacket (3) and can be carried out, the contact surfaces of the tube (2) to the gas at a against the gas at the prevailing temperatures chemically resistant layer, are composed of a high fluorine-containing plastic coating, and wherein the cooling jacket (3), the tube (2) to surrounds to its mouth (2a).