page_title: Schlenk flask
section_title: Standard Schlenk flask
hierarchical_section_title: Schlenk flask / Varieties / Standard Schlenk flask
caption_attribution_description: Standard Schlenk flask
context_page_description: A Schlenk flask, or Schlenk tube is a reaction vessel typically used in air-sensitive chemistry, invented by Wilhelm Schlenk. It has a side arm fitted with a PTFE or ground glass stopcock, which allows the vessel to be evacuated or filled with gases. These flasks are often connected to Schlenk lines, which allow both operations to be done easily.
  Schlenk flasks and Schlenk tubes, like most laboratory glassware, are made from borosilicate glass such as Pyrex.
  Schlenk flasks are round-bottomed, while Schlenk tubes are elongated. They may be purchased off-the-shelf from laboratory suppliers or made from round-bottom flasks or glass tubing by a skilled glassblower.
context_section_description: The standard Schlenk flask is a round bottom, pear-shaped, or tubular flask with a ground glass joint and a side arm.  The side arm contains a valve, usually a greased stopcock, used to control the flask's exposure to a manifold or the atmosphere.  This allows a material to be added to a flask through the ground glass joint, which is then capped with a septum.  This operation can, for example, be done in a glove box.  The flask can then be removed from the glove box and taken to a Schlenk line.  Once connected to the Schlenk line, the inert gas and/or vacuum can be applied to the flask as required.  While the flask is connected to the line under a positive pressure of inert gas, the septum can be replaced with other apparatus, for example a reflux condenser.  Once the manipulations are complete, the contents can be vacuum dried and placed under a static vacuum by closing the side arm valve.  These evacuated flasks can be taken back into a glove box for further manipulation or storage of the flasks' contents.
caption: A pear-shaped Schlenk flask.  The flask's sidearm contains a greased stopcock valve, and the flask is capped with a Suba•Seal septum that has not been turned down.
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