Also known as rubber bungs, rubber stoppers are used to seal bottles, tubes and many other containers. They plug containers from the outside without displacing the volume inside. Some more resistant stoppers can also be used for heavy industrial processes.
A rubber stopper is a small, tapered plug used to seal the openings of test tubes, flasks and other laboratory glassware. Stoppers made of cork are also available for this purpose. However, rubber stoppers are preferable for applications that require a tighter seal or a greater degree of chemical resistance.
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