Drying tube

Drying tubes without filling.

Drying tube, schematic representation.

The drying tube is a straight, angled or U-shaped glass tube, at one end there is usually a standard ground joint , the second end is open. There are designs with and without a stopcock plug .

Filling

The drying tube is first filled with a little cotton wool, then with solid desiccants (e.g. calcium chloride or silica gel ) and the open end is then "closed" again with some cotton wool.

use

The drying tube is placed on vessels (e.g. round-bottom flasks) or apparatuses using the standard ground joint that contain moisture-sensitive or hygroscopic substances that are to be protected from air humidity .

Individual evidence

^ Gerhard Meyendorf: laboratory equipment and chemicals , people and knowledge Volkseigener Verlag Berlin, 1965, pp. 59–60.
^ Brockhaus ABC Chemie , VEB FA Brockhaus Verlag Leipzig 1965, pp. 1440–1441.

[Meyendorf-1] Gerhard Meyendorf: laboratory equipment and chemicals , people and knowledge Volkseigener Verlag Berlin, 1965, pp. 59–60.

[ABC_Chemie-2] Brockhaus ABC Chemie , VEB FA Brockhaus Verlag Leipzig 1965, pp. 1440–1441.