Stopper (plug)

Conical closure used to seal a container

"Bung" redirects here. For other uses, see Bung (disambiguation).

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (February 2024) (Learn how and when to remove this message)

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A jug with a cork stopper Bung in the bunghole of a wine barrel Cork stoppers from wine bottles

A stopper, bung, or cork is a cylindrical or conical closure used to seal a container, such as a bottle, tube, or barrel.

## Description

[edit]

Unlike a lid or bottle cap, which encloses a container from the outside without displacing the inner volume, a bung is partially or wholly inserted inside the container to act as a seal. A bung can be defined as "a plug or closure used to close an opening in a drum or barrel. It is called a plug when referring to a steel drum closure."[1]

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. When used to seal the bungholes of barrels, the stopper is called a bung. Other bungs, particularly those used in chemical barrels, may be made of metal and be screwed into place via threading.[citation needed]

## Ground glass joint

[edit]

Main article: Ground glass joint

Ground glass stoppers

Ground glass joint (or ground glass stoppers) are commonly used with laboratory glassware, mainly because of their nonreactivity. Some stoppers used in labs have holes in them to allow the insertion of glass or rubber tubing. This is often used when a reaction is taking place in the flask or test tube and the byproduct or result of the reaction is desired to be collected. For instance, if one were to boil water in a test tube and wanted to collect the water vapor, one could seal the test tube with a stopper with holes in it. With tubing inserted into the hole(s), when the tube is heated, water vapor will rise through the hole, make its way through the tubing, and into the collection chamber of choice. The water vapor would not be able to escape into the air, because the stopper and the tubing, if set up correctly, would be airtight.[citation needed]

## Rubber bungs

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Main article: Laboratory rubber stopper

In chemistry, bungs made of hardened rubber are frequently used in small-scale experimental set-ups involving non-corrosive gases. Some chemistry bungs may also include one or more holes so a glass tube or laboratory funnel may be inserted through the bung and into the container or another piece of apparatus. The rubber bung may be used to seal a flask because the user may require the contents to be mixed via shaking the flask or may require that the contents be kept inside the flask and prevented from leaking out. In all cases, the bung keeps the experimentation environment sealed so that liquids or gases cannot escape (or enter).[citation needed]

For applications that place higher demands on the bung in terms of temperature and mechanical stability or solvent resistance, standardized glass stoppers and connectors are preferred.[citation needed]

Bottle stoppers made from gutta-percha, a natural rubber that is both chemically resistant and thermoplastic, were the first product of the Gutta Percha Company, better known for making submarine telegraph cables.[2]

## See also

[edit]

* Bunghole
* Cork borer
* Closure (container)
* Hutchinson Patent Stopper

## References

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Wikimedia Commons has media related to Stoppers (container components).

1. ^ Soroka, W.; Institute of Packaging Professionals (2008). Illustrated Glossary of Packaging Terminology. Institute of Packaging Professionals. p. 27\. ISBN 978-1-930268-27-2. Retrieved February 13, 2024.
2. ^ Haigh, Kenneth Richardson (1968). Cableships and Submarine Cables. United States Underseas Cable Corporation. p. 26-27. Retrieved February 13, 2024.

* Yam, K.L. (2010). The Wiley Encyclopedia of Packaging Technology. Wiley. ISBN 978-0-470-54138-8.

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Packaging

General
topics|

* Active packaging
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Product
packages|

* Alternative wine closure
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Containers|

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Materials
and
components|

* Adhesive
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* Polyester
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* Screw cap
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* Security printing
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* Shock detector
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* Shrink wrap
* Slip sheet
* Staple (fastener)
* Strapping
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* Susceptor
* Tamper-evident band
* Tear tape
* Temperature data logger
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* Tinplate
* Velostat

Processes|

* Aseptic processing
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Machinery|

* Barcode printer
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Environment,
post-use|

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Category: Packaging

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Laboratory equipment

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Other items|

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Glassware

| Apparatus|

* Dean–Stark
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|

Bottles|

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Condensers|

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Dishes|

* Evaporating
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Flasks|

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Funnels|

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Measuring devices|

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Tubes|

* Drying
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* Test
* Thiele
* Thistle

Other items|

* Beaker
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* Vial

Analytical chemistry

| Compositional|

* AutoAnalyzer
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* Mass spectrometer (MS)
* pH indicator
* pH meter

|

Microscopy|

* Scanning electron microscope (SEM)
* Transmission electron microscope (TEM)

Thermochemistry|

* Calorimeter
* differential scanning
* Melting-point apparatus
* Thermometer
* Thermogravimetric analyzer (TGA)

Other items|

* Analytical balance
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* Plate reader

Electronics

| Control devices|

* Bench power supply
* Current source
* Voltage source
* Function generator
* Galvanostat
* Pulse generator
* Potentiostat

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Measurement|

* Ammeter
* Logic analyzer
* Multimeter
* Network analyzer
* Oscilloscope
* Spectrum analyzer
* Time-domain reflectometer
* Transistor tester
* Voltmeter

Tools|

* Heat gun
* Soldering iron
* Tweezers
* Wire stripper

General|

* Alligator clip
* Test probe

Safety

Personal protective
equipment (PPE)

* Lab coat
* Face shield
* Respirator
* Rubber apron
* Safety shower

Eye and hand|

* Acid-resistant gloves
* Eyewash station
* Glove box
* Medical gloves
* Nitrile gloves
* Safety glasses
* Safety goggles

Other items|

* Biosafety cabinet
* Fire blanket
* Fire extinguisher
* Fume hood
* Safety cabinet
* Solvent cabinet

Instruments used in medical laboratories

Authority control databases

National|

* Germany

Other|

* Yale LUX

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