Laboratory rubber stopper

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(From left to right) One-hole Rubber bung size 10, Two-hole Rubber bung size 14, and Solid Rubber bung size 16 Rubber stopper holes.jpg
(From left to right) One-hole Rubber bung size 10, Two-hole Rubber bung size 14, and Solid Rubber bung size 16

A laboratory rubber stopper or a rubber bung or a rubber cork is mainly used in chemical laboratories in combination with flasks and test tube and also for fermentation in winery. [1] [2] [3] Generally, in a laboratory, the sizes of rubber stoppers can be varied up to approximately 16 sizes and each of it is specific to certain type of container. As the rubber stopper is used in many experiments, some specific experiment requires a specific material. For example, the M35 Green neoprene stopper is for chemical resistance. For food fermentation, M18 white natural gum is preferred. For high temperature application, red or white silicone rubber stoppers should be used.

Contents

Sizes

Rubber bungs can have one or more hole(s) for plugging in tubes depending on the specification of the procedures. To prevent the liquid chemical leaks or escape the container, the rubber bung should fit tightly to the container's opening; the dimension of the rubber bung is of concern. These are some of the sizes that are commonly seen in chemical laboratory.

(From left to right) Rubber bungs are aligned from size no. 1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, to 16, respectively. (Comparing to the ruler) Rubber stopper size.jpg
(From left to right) Rubber bungs are aligned from size no. 1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, to 16, respectively. (Comparing to the ruler)
Size No.Top
mm
Bottom
00012.78.212x75 test tubes
001510
01713
11914
2201620x150 or 10ml test tubes
32418
4262025x200(150) or 20ml test tubes
5272350 ml Flasks
63226250ml Erlenmeyer Flasks
73730500ml Erlenmeyer Flasks
841331000ml Erlenmeyer Flasks/ Florence Flask/ Filter Flask
945371000ml Erlenmeyer Flasks/ Florence Flask
1050421000ml Filter Flasks

2000ml Erlenmeyer Flasks/ Florence Flask

115648
1264544000ml Filter Flasks
136858
149075
1510383
1612790

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References

  1. US 2196785,Takiguchi, Ei,"Rubber stopper for bottles, jars, vessels, and like containers",published 1940-04-09
  2. US 2289677,Perelson, Harold N.,"Rubber stopper",published 1942-07-14
  3. US 2669370,Royall Jr., Ivey G.,"Rubber stopper",published 1954-02-16, assigned to Goodyear Tire and Rubber Company