page_title: Schlenk flask
section_title: Straus flask
hierarchical_section_title: Schlenk flask / Varieties / Straus flask
caption_attribution_description: Solvent pot
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: A Straus flask (often misspelled "Strauss") is subclass of "bomb" flask originally developed by Kontes Glass Company, commonly used for storing dried and degassed solvents.  Straus flasks are sometimes referred to as solvent bombs — a name which applies to any Schlenk bomb dedicated to storing solvent.  Straus flasks are mainly differentiated from other "bombs" by their neck structure.  Two necks emerge from a round bottom flask, one larger than the other.  The larger neck ends in a ground glass joint and is permanently partitioned by blown glass from direct access to the flask.  The smaller neck includes the threading required for a teflon plug to be screwed in perpendicular to the flask.  The two necks are joined through a glass tube.  The ground glass joint can be connected to a manifold directly or through an adapter and hosing.  Once connected, the plug valve can be partially opened to allow the solvent in the Straus flask to be vacuum transferred to other vessels.  Or, once connected to the line, the neck can be placed under a positive pressure of inert gas and the plug valve can be fully removed.  This allows direct access to the flask through a narrow glass tube now protected by a curtain of inert gas.  The solvent can then be transferred through cannula to another flask.  In contrast, other bomb flask plugs are not necessarily ideally situated to protect the atmosphere of the flask from the external atmosphere.
caption: A solvent pot ready to have its dried and degassed contents vac transferred to another reaction vessel.  This pot contains dibutyl ether dried over sodium and benzophenone, which gives it its purple color.
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