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At the opening(s) at top of the neck of some glass flasks such as round-bottom flasks, retorts, or sometimes volumetric flasks, there are outer (or female) tapered (conical) ground glass joints. Some flasks, especially volumetric flasks, come with a laboratory rubber stopper , bung , or cap for capping the opening at the top of the neck.
A glass stopper is often called a "ground glass joint" (or "joint taper"), and a cork stopper is called simply a "cork". Stoppers used for wine bottles are referred to as "corks", even when made from another material. [citation needed] A common every-day example of a stopper is the cork of a wine bottle.
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Common Quickfit components include (1) Pear shaped flask, 50 ml (2) Stillhead (3) Liebig condenser (4) Screwcap adapter (5) Receiver adapter (6) Thermometer (7) Dropping funnel, 50 ml, with Rotaflo tap (8) Stopper (9) Air leak / steam inlet tube (10) Round bottom flask, 25 ml (11) Air condenser / drying tube (12) Sintered glass funnel (13) Drying tube (14) Pear shaped flask, 50 ml, with angled ...
Crude versions of conically tapered ground glass joints have been made for quite a while, [1] particularly for stoppers for glass bottles and retorts. [2] Crude glass joints could still be made to seal well by grinding the two parts of a joint against each other using an abrasive grit, but this led to variations between joints and they would not seal well if mated to a different joint.
These flasks are usually pear-shaped, with a flat bottom, and made of glass or plastic. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper. The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking. The marking indicates the volume ...